British Airways Engineering Training - Hydraulic Power Systems PDF
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British Airways Engineering Training Centre
John QuinlisK
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These notes are from British Airways Engineering Training Centre for a course on hydraulic power systems in A318/19/20/21 single aisle family aircraft. Detailing hydraulic system users, priority valves, system overview, maintenance practice, and reservoir pressurization.
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British Airways Engineering Training Centre ATA 29 B1 A318/19/20/21 Single Aisle Family ETBN 0570 A318/19/20/21 ISSUE 2 AUGUST 2008 TB1-32XSTD STL 945.1380/05 Issue 1 B r i t i s h A i r w a y s E n g i n e e r...
British Airways Engineering Training Centre ATA 29 B1 A318/19/20/21 Single Aisle Family ETBN 0570 A318/19/20/21 ISSUE 2 AUGUST 2008 TB1-32XSTD STL 945.1380/05 Issue 1 B r i t i s h A i r w a y s E n g i n e e r i n g T r a i n i n g Your Course Notes These notes have been prepared by British Airways Engineering Training to provide a source of reference during your period of training. The information presented is as correct as possible at the time of printing and is not subject to amendment action. They will be useful to you during your training, but I must emphasise that the appropriate Approved Technical Publications must always be used when you are actually working on the aircraft. I trust your stay with us will be informative and enjoyable. JOHN QUINLISK Training and Quality Delivery Manager SINGLE AISLE TECHNICAL TRAINING MANUAL HYDRAULIC POWER Hydraulic System Users (1)................................. 2 Hydraulic Power Level 2 (2)................................ 4 Circuit Identification and Routing (2)........................ 32 Hydraulic System Warnings (3)............................. 40 Green Hydraulic System D/O (3)............................ 42 Blue Hydraulic System D/O (3)............................. 50 Yellow Hydraulic System D/O (3)........................... 58 Leak Measurement System Presentation (3)................... 72 Hydraulic Reservoir Pressurizing SYS D/O (3)................. 74 Hydraulic Reservoir Filling Presentation (2)................... 78 Seal Drain System Presentation (2).......................... 80 MAINTENANCE PRACTICE Reservoir Depressurization (2).............................. 86 Reservoir Filling (2)...................................... 92 RAT Stowage and Servicing (2)............................ 100 RAT Test (3)........................................... 110 Hydraulic Leakage (3)................................... 122 U3T06191 - U13T1M0 MAINTENANCE COURSE - T1 (CFM56-5B/ME) TABLE OF CONTENTS May 11, 2006 29 - HYDRAULIC POWER Page 1 SINGLE AISLE TECHNICAL TRAINING MANUAL HYDRAULIC SYSTEM USERS (1) GREEN, BLUE, YELLOW USERS The three independent hydraulic systems respectively supply the users indicated on the diagram. Between these systems, the users are shared in order to ensure the aircraft control, even if only one hydraulic system is inoperative. On the blue hydraulic system, the Constant Speed Motor/Generator (CSM/G) is used to provide aircraft electrical power in case of emergency. PRIORITY VALVES In the event of low hydraulic pressure, the priority valves maintain the operation of essential systems by cutting off hydraulic power to heavy load users. U3T06191 - U13T1M0 - UM29P1000000001 MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC SYSTEM USERS (1) May 10, 2006 29 - HYDRAULIC POWER Page 2 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29P1000000001 GREEN, BLUE, YELLOW USERS & PRIORITY VALVES MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC SYSTEM USERS (1) May 10, 2006 29 - HYDRAULIC POWER Page 3 SINGLE AISLE TECHNICAL TRAINING MANUAL HYDRAULIC POWER LEVEL 2 (2) It can be deployed automatically or manually depending on the failure SYSTEM OVERVIEW conditions. The RAT is locked when extended. On the green system the normal source of pressure is the Engine Driven An index lock mechanism will only permit RAT stowage if the blades Pump (EDP) and as auxiliary source the Power Transfer Unit (PTU). are properly aligned. On the blue system the normal source of pressure is the electrical pump It also prevents rotation when stowed. The index lock will release at (E-Pump) and as auxiliary source the Ram Air Turbine (RAT). approximately 5 degrees from the full extension position. NOTE: The blue electric pump can be used as an auxiliary power source Extension is by spring force. Retraction (stowage) is by blue hydraulic for maintenance purposes on ground. pressure. On the yellow system the normal source of pressure is the Engine Driven Up lock release is by solenoid operation. Pump (EDP) and as auxiliary sources the Power Transfer Unit (PTU) Down lock release is by hydraulic pressure. and the electric pump (E- Pump). NOTE: The yellow system also has a hand pump dedicated to cargo door operation. PTU The Power Transfer Unit (PTU) is an auxiliary pressure supply for either the green or yellow systems without transfer of fluid between the two systems. It operates automatically if there is a delta pressure of 500psi between the green / yellow or yellow / green hydraulic systems. The side operating as a pump will take fluid from its associated U3T06191 - U13T1M0 - UM29BA000000001 reservoir and provide an output through the PTU manifold to the HP manifold. The motor side is supplied from the HP manifold through the PTU manifold, and is connected to the return system. Each section of the PTU has a case drain connection to the return system. RAT The Ram Air Turbine (RAT) is an auxiliary pressure supply for the blue system, and for the emergency electrical power CSM / G. MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 4 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29BA000000001 SYSTEM OVERVIEW - PTU & RAT MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 5 SINGLE AISLE TECHNICAL TRAINING MANUAL HYDRAULIC POWER LEVEL 2 (2) SERVICING RESERVOIR AIR PRESSURIZATION All three reservoirs are pressurized to 50 psi to prevent pump cavitations. The non-return valves in each reservoir supply manifold, make sure that the pressure will be maintained for up to 12 hours after engine shutdown on ground, and for up to 3 hours following a failure of the air supply in flight. Each reservoir has a depressurization valve on its associated service panel. For long time depressurization, a depressurization tool may be installed on the depressurization valve. A 77 psi pressure relief valve is installed onto the supply manifold at each reservoir. All tree reservoirs are pressurized from Engine 1 for normal supply and the bleed air system for alternate supply at 43 psi. The air pressurization manifold has a ground supply connection. It is put into the blue hydraulic bay and regulates normal or ground supply to 50 psi. Cleanable filters have clogging indicators. There are two water drains, one is automatic after engines and APU shut down, and the other is manually operated. U3T06191 - U13T1M0 - UM29BA000000001 After maintenance on the hydraulic system, the reservoir pressurization can be done via a pneumatic ground cart connected to the reservoir pressure unit, the APU, or the pneumatic system ground connection. MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 6 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29BA000000001 SERVICING - RESERVOIR AIR PRESSURIZATION MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 7 SINGLE AISLE TECHNICAL TRAINING MANUAL HYDRAULIC POWER LEVEL 2 (2) SERVICING (continued) FLUID LEVEL CHECK The following Aircraft Configuration is needed for a correct fluid level check and servicing: - the speed brakes and spoilers must be retracted, - the thrust reversers stowed, - the cargo doors closed, - all system accumulators empty of fluid, - the accumulators pre-charge pressure must be checked, - the reservoirs pressurized with air, - the landing gear must be in down position with the landing gear doors closed (one door may be open), - and the brake accumulator may be pressurized with fluid. U3T06191 - U13T1M0 - UM29BA000000001 MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 8 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29BA000000001 SERVICING - FLUID LEVEL CHECK MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 9 SINGLE AISLE TECHNICAL TRAINING MANUAL HYDRAULIC POWER LEVEL 2 (2) SERVICING (continued) RESERVOIR FILLING Switch on the yellow electric pump to make sure that the brake accumulator is pressurized, then switch the pump off. Connect the selected servicing source to the green servicing panel. When the panel hand pump is used, connect the hose to the hand pump and insert it into the fluid container, and then install the pump handle. The handle is stowed at the yellow servicing panel. When the external pump is used, connect the lower filling port and set the minimum flow, do not exceed 435 psi. Then select the reservoir to be filled, confirming associated light is ON, and fill with fluid to the upper end of the scale. NOTE: Over filling the reservoir will result in an inadequate pressurization. The reservoir level is also affected by large changes in ambient temperature. For every 10 °C change, the green volume changes by 0.85 Lt, the blue volume changes by 0.51 Lt, and the yellow volume changes by 0.64 Lt. U3T06191 - U13T1M0 - UM29BA000000001 MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 10 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29BA000000001 SERVICING - RESERVOIR FILLING MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 11 SINGLE AISLE TECHNICAL TRAINING MANUAL HYDRAULIC POWER LEVEL 2 (2) SERVICING (continued) BLEEDING If you have filled the reservoir after: - maintenance, - or removal/installation of large hydraulic components, - or hydraulic fluid low level (loss of the hydraulic system), - or high loss of hydraulic fluid, Do the related bleeding procedure to make sure that the quantity of hydraulic fluid in the system is correct. After maintenance of the hydraulic system upstream of the EDP, loosen the nut of the case drain hose so that the air (or hydraulic fluid mixed with air bubbles) comes out of the connection. Check: - make sure that the air pressure in the reservoir of the associated hydraulic system is not less than 50 psi (if necessary, pressurize the reservoir), - read the gauge of the associated reservoir and make a note of the fluid level, - depressurize the reservoir of the associated hydraulic system, - after 5 minutes, read the gauge again and make a note of the level, - compare both levels, - if the difference between both levels is more than 2 liters, do the U3T06191 - U13T1M0 - UM29BA000000001 bleeding procedures again until the result is satisfactory. MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 12 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29BA000000001 SERVICING - BLEEDING MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 13 SINGLE AISLE TECHNICAL TRAINING MANUAL HYDRAULIC POWER LEVEL 2 (2) SERVICING (continued) HIGH PRESSURE (HP), CASE DRAIN, AND LOW PRESSURE (LP) FILTERS The three Hydraulic Systems have: - a HP filter in the pressure line, in the reservoir filling system, and the normal braking system, - an LP filter in the return line, - a case drain filter in the case drain line of the EDP's. The HP and the case drain filters have a red clogging indicator, which pops out when the filter is clogged (dirty). The LP filters have a replaceable filter elements and a by-pass system. U3T06191 - U13T1M0 - UM29BA000000001 MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 14 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29BA000000001 SERVICING - HIGH PRESSURE (HP), CASE DRAIN, AND LOW PRESSURE (LP) FILTERS MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 15 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29BA000000001 SERVICING - HIGH PRESSURE (HP), CASE DRAIN, AND LOW PRESSURE (LP) FILTERS MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 16 SINGLE AISLE TECHNICAL TRAINING MANUAL This Page Intentionally Left Blank U3T06191 - U13T1M0 - UM29BA000000001 MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 17 SINGLE AISLE TECHNICAL TRAINING MANUAL HYDRAULIC POWER LEVEL 2 (2) SERVICING (continued) ACCUMULATORS Each system has an accumulator, located in their associated hydraulic bays. The yellow brake system has an accumulator for emergency braking and parking brake. The nitrogen pre-charge is adjusted at the accumulator in accordance to the ambient temperature. On system pressurization the accumulators will each take approximately 1 Lt. of fluid. Each accumulator has a nitrogen pressure indicator. U3T06191 - U13T1M0 - UM29BA000000001 MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 18 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29BA000000001 SERVICING - ACCUMULATORS MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 19 SINGLE AISLE TECHNICAL TRAINING MANUAL HYDRAULIC POWER LEVEL 2 (2) SERVICING (continued) EXTERNAL LEAK TEST OF COMPONENTS A leak is the quantity of fluid that comes out of a component and that is sufficient to become a drop or drops, or will possibly become a drop of approximately 20 drops =1 cc, and 75600 drops =1 gallon. A leakage is a quantity of fluid on the surface of a component that is not sufficient to become a drop. A stain is an area on the surface of a component that has a different color. It is usually caused when fluid leakage becomes dry on the component surface after a high temperature operation. For a correct analysis of component leak rates, you must obey the subsequent steps: - the seal obtained at hydraulic tube connections is obtained on metal-to-metal surfaces. If a leak cannot be stopped by tightening the nut to the specified torque, the joint is probably defective and should be repaired. - when possible, activate components for some cycles before carrying out the external leakage check. - dynamic seals are easy to examine for leakage while in the static condition because pistons, slide valves and swivel joints move only during a short time interval. Many components cannot be obviously U3T06191 - U13T1M0 - UM29BA000000001 monitored during operation. - by following the AMM procedure operate the related component, - after operation, inspect the component. If there is a sign of any external leakage, compare the quantity of leakage with the values given in the AMM table for specified limits. MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 20 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29BA000000001 SERVICING - EXTERNAL LEAK TEST OF COMPONENTS MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 21 SINGLE AISLE TECHNICAL TRAINING MANUAL HYDRAULIC POWER LEVEL 2 (2) DAILY CHECKS During the daily check the reservoirs quantity indication on the ECAM display unit have to be checked. In case of incorrect findings during this check, the related AMM tasks have to be done to restore the system to normal status or to readjust quantities and pressures to nominal values. In case of hydraulic fluid level find below normal, the system needs to be refilled using the Hand Pump or a Hydraulic Service Cart. In case of hydraulic fluid level find above normal, the system needs to be drained. U3T06191 - U13T1M0 - UM29BA000000001 MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 22 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29BA000000001 DAILY CHECKS MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 23 SINGLE AISLE TECHNICAL TRAINING MANUAL HYDRAULIC POWER LEVEL 2 (2) MEL/DEACTIVATION The fluid quantity have to be checked on the reservoir direct reading gage prior to each flight. The LO LVL Warning has to be checked operative before the first flight. The air pressure have to be checked on the reservoir direct reading gage prior to each flight. U3T06191 - U13T1M0 - UM29BA000000001 MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 24 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29BA000000001 MEL/DEACTIVATION MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 25 SINGLE AISLE TECHNICAL TRAINING MANUAL HYDRAULIC POWER LEVEL 2 (2) MAINTENANCE TIPS PTU PTU inhibition is achieved by closing the solenoid valves (they are fail safe open) at the PTU manifolds, and for maintenance actions by also disconnecting the coupling on the yellow (right) side of the unit. The PTU operation is inhibited at first engine start and during cargo door operation. NOTE: At the second engine start, the inhibition is removed when the second engine master switch is set to ON then the PTU will operate momentarily for self test purpose. RAT The RAT can be tested on ground by using the Ground Check Module. A RAT retraction module controls the RAT stowage procedure, it is located on the blue servicing panel. NOTE: To avoid any extension during maintenance work a RAT safety tool must be installed. SAFETY PRECAUTIONS U3T06191 - U13T1M0 - UM29BA000000001 To prevent an unwanted operation of the PTU, the isolation coupling must be disconnected. Keep the RAT extension area clear of ground equipment and personnel. Install the RAT safety device before to work in the RAT area. MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 26 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29BA000000001 MAINTENANCE TIPS - PTU... SAFETY PRECAUTIONS MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 27 SINGLE AISLE TECHNICAL TRAINING MANUAL HYDRAULIC POWER LEVEL 2 (2) MAINTENANCE TIPS (continued) TIGHTENING TORQUES Before you torque a component or connection, obey the precautions and procedures given in the tightening practices for hydraulic connection procedure in the AMM Chapter 20. The tightening torques are given in the AMM tables chapter 20. When you use an adapter, the values shown on the dial of the torque wrench is not the applied value.To get the correct value, the formula given on the next picture must be applied. The drawing shows as an example the tightening torque for HARRISSON and PERMASWAGE sleeve nuts and in-line-check valves and how to use a torque wrench and adapter. U3T06191 - U13T1M0 - UM29BA000000001 MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 28 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29BA000000001 MAINTENANCE TIPS - TIGHTENING TORQUES MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 29 SINGLE AISLE TECHNICAL TRAINING MANUAL HYDRAULIC POWER LEVEL 2 (2) 'A' CHECK ITEMS During the 'A' check: - the fluid level on the main hydraulic reservoir indicators have to be checked, - the air pressure of main hydraulic power reservoir have to be checked using the reading gage, - the clogging indicators on Engine Driven Pump (EDP) case drain filter (pop out not protruding) have to be checked, - the nitrogen charge pressure on hydraulic power Accumulators have to be checked using the direct reading gage. In case or incorrect findings during these checks, the related AMM tasks have to be done to restore the system to normal status or to readjust quantities and pressures to nominal values. U3T06191 - U13T1M0 - UM29BA000000001 MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 30 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29BA000000001 'A' CHECK ITEMS MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC POWER LEVEL 2 (2) May 10, 2006 29 - HYDRAULIC POWER Page 31 SINGLE AISLE TECHNICAL TRAINING MANUAL CIRCUIT IDENTIFICATION AND ROUTING (2) PIPE ROUTING The A/C has three hydraulically independent systems: blue, green, yellow. There are no hydraulic pipes in the passenger cabin or flight compartment. U3T06191 - U13T1M0 - UM29D1000000001 MAINTENANCE COURSE - T1 (CFM56-5B/ME) CIRCUIT IDENTIFICATION AND ROUTING (2) May 10, 2006 29 - HYDRAULIC POWER Page 32 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29D1000000001 PIPE ROUTING MAINTENANCE COURSE - T1 (CFM56-5B/ME) CIRCUIT IDENTIFICATION AND ROUTING (2) May 10, 2006 29 - HYDRAULIC POWER Page 33 SINGLE AISLE TECHNICAL TRAINING MANUAL CIRCUIT IDENTIFICATION AND ROUTING (2) PIPE IDENTIFICATION Each pipe is identified by a self-adhesive label, which indicates: - the part number of the pipe, - the identification of the pipe as a hydraulic pipe, its function with black dots and the direction of the fluid flow with yellow and blue fields, - an identification of the system comprising a color code and a number 1, 2 or 3 respectively indicating the Green, Blue, or Yellow system. U3T06191 - U13T1M0 - UM29D1000000001 MAINTENANCE COURSE - T1 (CFM56-5B/ME) CIRCUIT IDENTIFICATION AND ROUTING (2) May 10, 2006 29 - HYDRAULIC POWER Page 34 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29D1000000001 PIPE IDENTIFICATION MAINTENANCE COURSE - T1 (CFM56-5B/ME) CIRCUIT IDENTIFICATION AND ROUTING (2) May 10, 2006 29 - HYDRAULIC POWER Page 35 SINGLE AISLE TECHNICAL TRAINING MANUAL CIRCUIT IDENTIFICATION AND ROUTING (2) COMPONENT IDENTIFICATION Each hydraulic component is identified by a placard affixed on the structure near to it, which gives its Functional Item Number (FIN) and its designation. U3T06191 - U13T1M0 - UM29D1000000001 MAINTENANCE COURSE - T1 (CFM56-5B/ME) CIRCUIT IDENTIFICATION AND ROUTING (2) May 10, 2006 29 - HYDRAULIC POWER Page 36 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29D1000000001 COMPONENT IDENTIFICATION MAINTENANCE COURSE - T1 (CFM56-5B/ME) CIRCUIT IDENTIFICATION AND ROUTING (2) May 10, 2006 29 - HYDRAULIC POWER Page 37 SINGLE AISLE TECHNICAL TRAINING MANUAL CIRCUIT IDENTIFICATION AND ROUTING (2) CONNECTIONS The most common connections in the hydraulic system are shown below. There are two types of connections: - permanent connections or permaswage, - removable connections or standard straight or special fittings. The manifolds have bobbin type connections for some components. The bobbins are equipped with a square seal on the component side and an O-ring on the manifold side. U3T06191 - U13T1M0 - UM29D1000000001 MAINTENANCE COURSE - T1 (CFM56-5B/ME) CIRCUIT IDENTIFICATION AND ROUTING (2) May 10, 2006 29 - HYDRAULIC POWER Page 38 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29D1000000001 CONNECTIONS MAINTENANCE COURSE - T1 (CFM56-5B/ME) CIRCUIT IDENTIFICATION AND ROUTING (2) May 10, 2006 29 - HYDRAULIC POWER Page 39 SINGLE AISLE TECHNICAL TRAINING MANUAL HYDRAULIC SYSTEM WARNINGS (3) the PTU FAULT lights are in amber. The failure is shown amber on the G+Y SYS LO PR EWD associated to indications on the ECAM HYDraulic page. In case of dual pump failure on ground with engines running, the aural Y ELEC PUMP OVHT warning sounds, the MASTER WARNing and the ENG 1&2 PUMP FAULT lights come on. The failure is shown red on the EWD associated In case of yellow electric pump overheat the aural warning sounds, the to indications on the ECAM HYDraulic page. MASTER CAUT comes on and the ELEC PUMP FAULT light is amber. The failure is shown amber on the EWD associated to indications on the Y ELEC PUMP LO PR ECAM HYDraulic page. In case of reservoir LP the aural warning sounds, the MASTER CAUT PTU FAULT and the ELECT PUMP FAULT light come on. The failure is shown amber on the EWD associated to indications on the ECAM HYDraulic In case of PTU fault the aural warning sounds and the MASTER CAUT page. There is Yellow system LP if pressure is lower than 1450 psi (100 comes on. The failure is shown amber on the EWD associated to bar). Reset if pressure is greater than 1750 psi (120 bar) with: indications on the ECAM HYDraulic page. The PTU is not running in - Y ELEC PUMP P/B at ON, case of GREEN or YELLOW system LO PR, when at least one engine - Y ENG PUMP and PTU not available. is running. B RSVR LO LVL RAT FAULT In case of reservoir low level the aural warning sounds, the MASTER In case of Ram Air Turbine (RAT) fault the aural warning sounds and CAUTion and the ELEC PUMP FAULT lights come on. The failure is the MASTER CAUT and PTU FAULT lights come on. The failure is shown amber on the EWD associated to indications on the ECAM shown amber on the EWD associated to indications on the ECAM HYDraulic page. HYDraulic page. A RAT fault occurs in case of: U3T06191 - U13T1M0 - UM29W1000000001 - pressure present in the RAT stowing actuator, G RSVR LO AIR PR - RAT pump LP. In case of reservoir low air pressure the aural warning sounds, the G ENG 1 PUMP LO PR MASTER CAUT, the ENG 1 PUMP and the Power Transfer Unit (PTU) FAULT lights come on. The failure is shown amber on the EWD In case of green engine1 pump LP fault the aural warning sounds, the associated to indications on the ECAM HYDraulic page. MASTER CAUT comes on and the ENG 1 PUMP light is amber. The green hydraulic pressure decreases below a given differential pressure Y RSVR OVHT between the green and yellow systems. If the green/yellow differential pressure exceeds 500 psi (35 bar), the PTU runs. Flight phases 1 and 10 In case of reservoir overheat air pressure the aural warning sounds, the are inhibited because the A/C is on the ground with no engines running. MASTER CAUT comes on and the ENG PUMP, the ELEC PUMP and The related engine shutdown also inhibits flight phases 2 and 9. MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC SYSTEM WARNINGS (3) May 10, 2006 29 - HYDRAULIC POWER Page 40 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29W1000000001 G+Y SYS LO PR... G ENG 1 PUMP LO PR MAINTENANCE COURSE - T1 (CFM56-5B/ME) HYDRAULIC SYSTEM WARNINGS (3) May 10, 2006 29 - HYDRAULIC POWER Page 41 SINGLE AISLE TECHNICAL TRAINING MANUAL GREEN HYDRAULIC SYSTEM D/O (3) mode. Case drain filter clogging indication: P = 87 ± 8.7 psi (6 ± 0.6 GENERAL bar). Most of the system components are installed in the MLG compartment. GROUND COUPLINGS RESERVOIR The ground service panel has two connectors used to pressurize the green hydraulic system from a ground cart, a selector valve, two connectors The reservoir has a direct reading gauge, a quantity indicator and a low and a hand pump used for hydraulic reservoir refilling. level switch for ECAM indicating and warning. There are three levels: - normal fill level: 14 l. (3.7 US gal), - maximum gaugeable level: 18 l. (4.76 US gal), - low level warning: 3.0 ± 0.4 l. (0.79 ± 0.1 US gal). RESERVOIR PRESSURIZATION The reservoir is normally pressurized with air to prevent cavitation of the pumps. The reservoir is pressurized to 50 psi (3.45 bar) and is sealed to hold the pressure when there is no air supply. The threshold of the LP switch is 22 psi (1.52 bar). The threshold of the pressure relief valve is 77 psi (5.3 bar). FIRE VALVE The green system fire valve installed in the LH wing, inboard of the U3T06191 - U13T1M0 - UM29D2000000001 pylon, is controlled by ENG 1 FIRE P/B. When the valve closes, it stops the supply of fluid to the Engine Driven Pump (EDP). EDP The EDP is attached to the accessory gearbox. A solenoid valve controlled by the ENG 1 PUMP P/B selects the pressurized or depressurized mode. The EDP cooling and lubricating flow goes through the case drain filter installed in the return circuit. Pump outlet pressure is 3000 psi (206 bar) at zero flow. The EDP includes a blocking valve which isolates the pump from the hydraulic system when the pump operates in depressurized MAINTENANCE COURSE - T1 (CFM56-5B/ME) GREEN HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 42 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29D2000000001 GENERAL... GROUND COUPLINGS MAINTENANCE COURSE - T1 (CFM56-5B/ME) GREEN HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 43 SINGLE AISLE TECHNICAL TRAINING MANUAL GREEN HYDRAULIC SYSTEM D/O (3) PTU The Power Transfer Unit (PTU) will run automatically when the differential pressure between the green and yellow circuits is greater than 500 psi (34.5 bar). The PTU is inhibited on ground, for cargo door operation and during the first engine start, if parking brake is set on or nose wheel steering is disconnected for towing. U3T06191 - U13T1M0 - UM29D2000000001 MAINTENANCE COURSE - T1 (CFM56-5B/ME) GREEN HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 44 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29D2000000001 PTU MAINTENANCE COURSE - T1 (CFM56-5B/ME) GREEN HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 45 SINGLE AISLE TECHNICAL TRAINING MANUAL GREEN HYDRAULIC SYSTEM D/O (3) PRESSURE SWITCH ACCUMULATOR The accumulator acts as a damper for small changes. It also makes a The EDP pressure switch monitors the EDP outlet pressure for ECAM supply of fluid available in case of any demand. The accumulator is indications. The threshold of the pressure switch is 1740 psi (120 bar). precharged with nitrogen to 1885 psi (130 bar) at 20°C. It holds 1.1l (0.29 US gal) of total volume of fluid when it is full. NOTE: A check valve downstream of the pump stops the fluid flow to the pump if the system is pressurized by the PTU. SAMPLING VALVE A sampling valve is provided on the HP manifold. HP MANIFOLD PRESSURE RELIEF VALVE The High Pressure (HP) manifold supplies the PTU manifold and the The system relief valve connects the HP circuit to the return circuit leak measurement manifold. in case of overpressure. The relief valve opens at 3436 psi (237 bar) PRESSURE SWITCHES and closes at 3190 psi (220 bar). The signals from both pressure switches at the HP manifold are sent to the Flight Control Computers (FCCs), to the Braking/Steering Control Unit (BSCU), the ECAM will receive information from one of the two switches for LP indication, and to the Flight Augmentation Computer (FAC). The threshold of the pressure switches is 1450 psi (99.5 bar). PRESSURE TRANSDUCER The pressure transducer provides data for pressure indication on the U3T06191 - U13T1M0 - UM29D2000000001 ECAM and sends information to Elevator Aileron Computers (ELACs) 1 and 2. LEAK MEASUREMENT VALVE The leak measurement valve isolates the primary flight controls when the guarded LEAK MEASUREMENT VALVES P/B on the maintenance panel is set to OFF. HP FILTER The HP filter has a clogging indicator. The clogging indicator operates when the differential pressure is higher than 87 ± 8.7 psi (6 ± 0.6 bar). MAINTENANCE COURSE - T1 (CFM56-5B/ME) GREEN HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 46 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29D2000000001 PRESSURE SWITCH & HP MANIFOLD MAINTENANCE COURSE - T1 (CFM56-5B/ME) GREEN HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 47 SINGLE AISLE TECHNICAL TRAINING MANUAL GREEN HYDRAULIC SYSTEM D/O (3) LEAK MEASUREMENT MANIFOLD The leak measurement manifold supplies the flight controls of the RH wing, LH wing and tail section via three outputs. After closing the related leak measurement valve, operating manually a spool valve allows the associated section to be supplied for leak measurement testing. PTU MANIFOLD The PTU manifold is composed of three different valves: - the normal braking selector valve which cuts the hydraulic supply to the normal brakes, - the solenoid valve installed in the PTU supply line which stops the PTU operation, - the priority valve which makes sure that all available hydraulic pressure is sent to the primary flight controls if pressure in the system is reduced. RETURN MANIFOLD The return manifold comprises: - one return filter with a clogging indicator, - one temperature transmitter which has one temperature switch and two temperature transducers. U3T06191 - U13T1M0 - UM29D2000000001 The bypass operates when the differential pressure across the filter is more than 29 ± 2.35 psi (2 ± 0.16 bar). The temperature switch and temperature transducers send data to the ECAM for warnings. MAINTENANCE COURSE - T1 (CFM56-5B/ME) GREEN HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 48 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29D2000000001 LEAK MEASUREMENT MANIFOLD... RETURN MANIFOLD MAINTENANCE COURSE - T1 (CFM56-5B/ME) GREEN HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 49 SINGLE AISLE TECHNICAL TRAINING MANUAL BLUE HYDRAULIC SYSTEM D/O (3) RESERVOIR The reservoir has a direct reading gauge, a quantity indicator and a low level switch for ECAM indicating and warning. Normal fill level: 6 l (1.58 US gal). Maximum gaugeable level: 8 l (2.11 US gal). Low level warning: between 2.0 and 2.3 l (0.52 and 0.6 US gal). RESERVOIR PRESSURIZATION The reservoir is normally pressurized with air to prevent pump cavitation. The reservoir is pressurized to 50 psi (3.43 bar) and is sealed to hold the pressure when there is no air supply. The threshold of the air pressure switch is 22 psi (1.52 bar). The threshold of the air pressure relief valve is 77 psi (5.3 bar). ELECTRIC PUMP With the ELECtric (ELEC) PUMP P/B set to AUTO, the blue electric pump will run, if one engine is running, or the BLUE PUMP OverRiDe (OVRD) P/B is set to ON, or NLG is not compressed and AC power is available from the APU. With the last condition, at touchdown a time delay relay maintains the pump operation for two minutes after NLG compression. The pump outlet pressure is 3000 psi (206 bar) at zero flow. U3T06191 - U13T1M0 - UM29D3000000001 A temperature switch sends a signal to the ECAM if the pump body temperature exceeds 165°C. The electric pump cooling and lubricating flow goes through the case drain filter installed in the return circuit. MAINTENANCE COURSE - T1 (CFM56-5B/ME) BLUE HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 50 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29D3000000001 RESERVOIR... ELECTRIC PUMP MAINTENANCE COURSE - T1 (CFM56-5B/ME) BLUE HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 51 SINGLE AISLE TECHNICAL TRAINING MANUAL BLUE HYDRAULIC SYSTEM D/O (3) CURRENT TRANSFORMER AND PHASE UNBALANCE DETECTOR The system has a current transformer and a phase unbalance detector which protect the electric circuit from the electric pump. When there is a fault, the detector gets a signal from the current transformer. It uses this signal to stop the supply of power to relay and thus stop the motor. When the unit has operated, it stays in that condition until it is set again. This happens automatically when the supply of power to the unit is stopped (through operation of P/BSW HYD/BLUE/ELEC PUMP) and then started again (and there is no fault signal from the current transformer). U3T06191 - U13T1M0 - UM29D3000000001 MAINTENANCE COURSE - T1 (CFM56-5B/ME) BLUE HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 52 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29D3000000001 CURRENT TRANSFORMER AND PHASE UNBALANCE DETECTOR MAINTENANCE COURSE - T1 (CFM56-5B/ME) BLUE HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 53 SINGLE AISLE TECHNICAL TRAINING MANUAL BLUE HYDRAULIC SYSTEM D/O (3) RAM AIR TURBINE LEAK MEASUREMENT The leak measurement valve isolates the flight controls when the The Ram Air Turbine (RAT) is deployed automatically if all AC electrical guarded LEAK MEASUREMENT VALVES P/B on the maintenance power sources are lost at speeds greater than 100 kts, or manually by panel is set to OFF. using either one of the guarded P/Bs. HP FILTER PRESSURE SWITCH The HP filter has a clogging indicator. The clogging indicator operates The pressure switch monitors the electric pump pressure for ECAM when the differential pressure is higher than 87 ± 8.7 psi (6 ± 0.6 bar). indications. The threshold of the pressure switch is 1450 psi (99.5 bar). PRIORITY VALVE A check valve stops the flow of fluid to the electric pump if the system The priority valve makes sure that all available hydraulic pressure is is pressurized by the RAT. sent to the primary flight controls if pressure in the system is reduced. HIGH PRESSURE MANIFOLD The threshold of the priority valve is 1842 psi (127 bar). PRESSURE RELIEF VALVE The High Pressure (HP) manifold is composed of: - two pressure switches, The pressure relief valve connects the HP circuit to the return circuit - a pressure transducer, in case of over pressure. The relief valve opens at 3436 psi (237 bar) - a leak measurement valve, and closes at 3190 psi (220 bar). - a HP filter, SAMPLING VALVE - a priority valve, A sampling valve is installed on the HP manifold. - a pressure relief valve, - a sampling valve. ACCUMULATOR U3T06191 - U13T1M0 - UM29D3000000001 PRESSURE SWITCHES The accumulator acts as a damper for small changes. It also makes a The signals from both HP manifold pressure switches are sent to the supply of fluid available in case of demand. The accumulator is ECAM system and to the Flight Control Computers (FCCs). The precharged with nitrogen to 1885 psi (130 bar) at 20°C. It holds 1.1 l threshold of the pressure switches is 1450 psi (99.5 bar). (0.29 US gal) of total volume of fluid when it is full. PRESSURE TRANSDUCER The pressure transducer gives data for pressure indication on the ECAM and sends information to ELevator Aileron Computers (ELACs) 1 and 2. MAINTENANCE COURSE - T1 (CFM56-5B/ME) BLUE HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 54 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29D3000000001 RAM AIR TURBINE... ACCUMULATOR MAINTENANCE COURSE - T1 (CFM56-5B/ME) BLUE HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 55 SINGLE AISLE TECHNICAL TRAINING MANUAL BLUE HYDRAULIC SYSTEM D/O (3) LEAK MEASUREMENT MANIFOLD The leak measurement valve block supplies the flight controls of the RH wing, the LH wing and tail section via three outputs. After closing the related leak measurement valve, operating manually a spool valve lets the associated section of the flight controls be supplied for leak measurement test. RETURN MANIFOLD The return manifold comprises: - one return filter with a clogging indicator, - one temperature transmitter which has one temperature switch and two temperature transducers. The bypass operates when the differential pressure across the filter is more than 29 ± 2.35 psi (2 ± 0.16 bar). The temperature switch and probes send data to the ECAM for indication and warnings. GROUND COUPLINGS On ground it is possible to pressurize the blue hydraulic system from a ground power unit. U3T06191 - U13T1M0 - UM29D3000000001 MAINTENANCE COURSE - T1 (CFM56-5B/ME) BLUE HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 56 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29D3000000001 LEAK MEASUREMENT MANIFOLD... GROUND COUPLINGS MAINTENANCE COURSE - T1 (CFM56-5B/ME) BLUE HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 57 SINGLE AISLE TECHNICAL TRAINING MANUAL YELLOW HYDRAULIC SYSTEM D/O (3) mode. Case drain filter clogging indication: P = 87 ± 8.7 psi (6 ± 0.6 GENERAL bar). Most of the system components are installed in the yellow hydraulic GROUND COUPLINGS compartment, set in the RH belly fairing, FWD of the MLG compartment. On the ground it is possible to pressurize the yellow hydraulic system RESERVOIR from a ground power unit. The reservoir has a direct reading gauge, a quantity indicator and a low level switch for ECAM indications and warnings. There are three levels: - normal fill level: 12 l. (3.17 US gal), - maximum gaugeable level: 18 l. (4.76 US gal), - low level warning: 3.0 ± 0.4 l. (0.79 ± 0.1 US gal). RESERVOIR PRESSURIZATION The reservoir is normally pressurized with air to prevent cavitation of the pumps. The reservoir is pressurized to 50 psi (3.45 bar) and is sealed to hold the pressure when there is no air supply. The threshold of the LP switch is 22 psi (1.52bar). FIRE VALVE The yellow system fire valve installed in the RH wing, inboard of the U3T06191 - U13T1M0 - UM29D4000000001 pylon, is controlled by ENG 2 FIRE P/B. When the valve closes, it stops the supply of fluid from the reservoir to the Engine Driven Pump (EDP). EDP The EDP is attached to the accessory gearbox. A solenoid valve controlled by the ENG 2 PUMP P/B selects the pressurized or depressurized mode. The EDP cooling and lubricating flow goes through the case drain filter installed in the return circuit. Pump outlet pressure is 3000 psi (206 bar) at zero flow. The EDP includes a blocking valve which isolates the pump from the hydraulic system when the pump operates in depressurized MAINTENANCE COURSE - T1 (CFM56-5B/ME) YELLOW HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 58 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29D4000000001 GENERAL... GROUND COUPLINGS MAINTENANCE COURSE - T1 (CFM56-5B/ME) YELLOW HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 59 SINGLE AISLE TECHNICAL TRAINING MANUAL YELLOW HYDRAULIC SYSTEM D/O (3) PTU The Power Transfer Unit (PTU) will run automatically when the differential pressure between the green and yellow circuits is greater than 500 psi (34.5 bar). The PTU is inhibited on ground, for cargo door operation. And during the first engine, if parking brake is set on or nose wheel steering is disconnected for towing. U3T06191 - U13T1M0 - UM29D4000000001 MAINTENANCE COURSE - T1 (CFM56-5B/ME) YELLOW HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 60 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29D4000000001 PTU MAINTENANCE COURSE - T1 (CFM56-5B/ME) YELLOW HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 61 SINGLE AISLE TECHNICAL TRAINING MANUAL YELLOW HYDRAULIC SYSTEM D/O (3) PRESSURE SWITCH A pressure switch monitors the EDP outlet pressure for ECAM indications. The threshold of the pressure switch is 1740 psi (120 bar). NOTE: A check valve downstream of the pump stops the fluid flow to the pump if the system is pressurized by the PTU or by the yellow electric pump and the pressure supplied by the EDP is lower. ELECTRIC PUMP The yellow electric pump runs if the ELEC PUMP P/B is set to ON, or if a cargo door selector is operated. The electric pump cooling and lubricating flow goes through the return filter. In case of cargo door operation, the PTU is inhibited, the yellow leak measurement valve is closed and a signal is sent to the Slat Flap Control Computer (SFCC) 2 to prevent flaps movement. A check valve downstream of the pump stops the fluid flow to the pump if the system is pressurized from the EDP or the PTU. U3T06191 - U13T1M0 - UM29D4000000001 MAINTENANCE COURSE - T1 (CFM56-5B/ME) YELLOW HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 62 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29D4000000001 PRESSURE SWITCH & ELECTRIC PUMP MAINTENANCE COURSE - T1 (CFM56-5B/ME) YELLOW HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 63 SINGLE AISLE TECHNICAL TRAINING MANUAL YELLOW HYDRAULIC SYSTEM D/O (3) ELECTRIC PUMP (continued) CURRENT TRANSFORMER AND PHASE UNBALANCE DETECTOR The system has a current transformer and a phase unbalance detector which protect the electric circuit of the electric pump. When there is a fault, the detector gets a signal from the current transformer. It uses this signal to stop the supply of power to relay and thus stop the motor. When the unit has operated, it stays in that condition until it is set again. This happens automatically when the supply of power to the unit is stopped (through operation of P/BSW HYD/YELLOW/ELEC PUMP) and then started again (and there is no fault signal from the current transformer). U3T06191 - U13T1M0 - UM29D4000000001 MAINTENANCE COURSE - T1 (CFM56-5B/ME) YELLOW HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 64 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29D4000000001 ELECTRIC PUMP - CURRENT TRANSFORMER AND PHASE UNBALANCE DETECTOR MAINTENANCE COURSE - T1 (CFM56-5B/ME) YELLOW HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 65 SINGLE AISLE TECHNICAL TRAINING MANUAL YELLOW HYDRAULIC SYSTEM D/O (3) HAND PUMP The hand pump is installed on the ground service panel of the yellow system and is used for manual cargo door operation only. On ground, when no electrical power is available, the hand pump can be used to open or close the cargo doors. U3T06191 - U13T1M0 - UM29D4000000001 MAINTENANCE COURSE - T1 (CFM56-5B/ME) YELLOW HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 66 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29D4000000001 HAND PUMP MAINTENANCE COURSE - T1 (CFM56-5B/ME) YELLOW HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 67 SINGLE AISLE TECHNICAL TRAINING MANUAL YELLOW HYDRAULIC SYSTEM D/O (3) HP MANIFOLD PRESSURE RELIEF VALVE The system relief valve connects the HP circuit to the return circuit The HP manifold supplies the PTU manifold and the leak measurement in case of overpressure. The relief valve opens at 3436 psi (237 bar) manifold. and closes at 3190 psi (220 bar). PRESSURE SWITCHES ACCUMULATOR The signals from both HP manifold pressure switches are sent to the ECAM system, to the Flight Control Computers (FCCs) and to the The accumulator acts as a damper for small changes. It also acts as a Flight Augmentation Computer (FAC) 2. The threshold of the pressure supply of fluid available in case of request. The accumulator is precharged switches is 1450 psi (99.5 bar). with nitrogen to 1885 psi (130 bar) at 20°C. It holds 1.1l (0.29 US gal) of total volume of fluid when it is full. PRESSURE TRANSDUCER The pressure transducer gives data for pressure indication on the ECAM and sends information to ELevator Aileron Computers (ELACs) 1 and 2. LEAK MEASUREMENT VALVE The leak measurement valve isolates the primary flight controls when the guarded LEAK MEASUREMENT VALVES P/B on the maintenance panel is set to OFF. The solenoid valve is automatically closed if the yellow electric pump is energized by using cargo door selectors. This is to prevent any movement of the flight controls. U3T06191 - U13T1M0 - UM29D4000000001 HP FILTER The High Pressure (HP) filter has a clogging indicator. The clogging indicator operates when the differential pressure is higher than 87 ± 8.7 psi (6 ± 0.6 bar). SAMPLING VALVE A sampling valve is installed on the HP manifold. MAINTENANCE COURSE - T1 (CFM56-5B/ME) YELLOW HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 68 SINGLE AISLE TECHNICAL TRAINING MANUAL U3T06191 - U13T1M0 - UM29D4000000001 HP MANIFOLD & ACCUMULATOR MAINTENANCE COURSE - T1 (CFM56-5B/ME) YELLOW HYDRAULIC SYSTEM D/O (3) May 10, 2006 29 - HYDRAULIC POWER Page 69 SINGLE AISLE TECHNICAL TRAINING MANUAL YELLOW HYDRAULIC SYSTEM D/O (3) LEAK MEASUREMENT MANIFOLD The leak measurement manifold supplies the flight controls of the RH wing, LH wing and tail section via three outputs. Operating manually a
