Hydraulic System Questions PDF

# Hydraulic System Questions 1. **Why are the Hydraulic reservoirs pressurized? [FCOM 13.20.1]** * Ensures positive fluid flow to all hydraulic pumps 2. **What indications will you see if you have foaming in flight? [FCOM 13.20.7]** * LOW PRESSURE lights for both pumps (Blinking) * MA...

# Hydraulic System Questions 1. **Why are the Hydraulic reservoirs pressurized? [FCOM 13.20.1]** * Ensures positive fluid flow to all hydraulic pumps 2. **What indications will you see if you have foaming in flight? [FCOM 13.20.7]** * LOW PRESSURE lights for both pumps (Blinking) * MASTER CAUTION (Momentarily) * HYD (Momentarily) 3. **Which system components are common to both Hydraulic System A and B? [FCOM 13.20.2]** * Ailerons * Rudder * Elevators & Elevator Feel * Flight Spoilers (Half of total) 4. **With the loss of Hydraulic System A, what System A components are unrecoverable (no redundancies)? [QRH 13.4]** * Landing gear retraction * Ground spoilers 5. **With the loss of Hydraulic System B, what System B components are unrecoverable (no redundancies)? [QRH 13.9]** * Leading Edge Flaps & Slats retraction * Autobrakes 6. **What components are powered by the Standby Hydraulic System? [FCOM 13.20.4, 13.20.5]** * Rudder * Thrust Reversers * Leading Edge Flaps & Slats (extend only) * Standby Yaw Damper 7. **With regards to fluid volume output, what is the difference between the Engine-Driven Pump (EDP) and the Electric Motor- Driven Pump (EMDP)? [FCOM 13.20.3]** * An Engine-Driven Pump (EDP) supplies approximately 6 times the fluid volume of the related Electric Motor-Driven Pump (EMDP) 8. **When will you see RF (refill) next to the hydraulic quantity? [FCOM 13.10.2]** * Below 76% * Valid only when the airplane is on the ground with both engines shut down or * After landing with flaps up during taxi in 9. **When performing the preliminary preflight procedure, how would you determine that hydraulic quantity is low?** * RF (refill) is displayed next to the A or B quantity displays 10. **What is the appropriate action when you see the RF (refill) during the Preliminary Preflight Procedure? [GOM 11.9.3.1]** * Make M300 writeup * Call Maintenance Control via Dispatch 11. **What are the normal and maximum hydraulic system pressures? [FCOM 13.10.2]** * Normal Pressure: 3000 psi * Maximum Pressure: 3500 psi 12. **What would cause the ELEC 2 OVERHEAT light to illuminate? [FCOM 13.10.1]** * System A Electric Motor-Driven Pump (EMDP) has overheated or * Hydraulic fluid used to cool and lubricate that pump has overheated 13. **What is the minimum fuel in each main wing tank to provide adequate cooling for the hydraulic fluid for ground operation of Electric Motor-Driven Pumps (EDMP)? [FCOM 13.20.3]** * 1675 lbs 14. **What must be done if pushback is required without the use of a nose gear steering lockout pin? [FCOM NP.21.22, NP.21.42]** * Both System A hydraulic pumps must be selected OFF 15. **What is the purpose of the Power Transfer Unit (PTU)? [FCOM 13.20.4]** * Supply the additional volume of hydraulic fluid needed to operate the Autoslats and Leading Edge Flaps & Slats at the normal rate when system B Engine-Driven Pump (EDP) is inoperative 16. **Does the PTU transfer hydraulic fluid? [FCOM 13.20.4]** * No * The PTU uses system A pressure to power a hydraulic Motor-Driven Pump, which pressurizes system B hydraulic fluid 17. **When does the Power Transfer Unit (PTU) operate? [FCOM 13.20.4]** * Airborne and * Flaps not up and * System B Engine-Driven Pump (EDP) hydraulic pressure drops below limits 18. **What is the purpose of the Landing Gear Transfer Unit (LGTU)? [FCOM 13.20.4]** * Supply the volume of hydraulic fluid needed to raise the landing gear at the normal rate when system A Engine-Driven Pump (EDP) volume is lost 19. **When does the Landing Gear Transfer Unit (LGTU) operate? [FCOM 13.20.4, 14.20.3]** * Airborne and * No. 1 Engine RPM drops below a limit value and * Landing Gear lever is positioned UP and * Either main Landing Gear is not up and locked 20. **When is the Standby Hydraulic System primarily used? [FCOM 13.20.1, 13.20.4]** * As a backup if system A and/or B pressure is lost 21. **Does the System A or B pressure loss alone cause operation of the Standby Hydraulic System? [FCOM 13.20.5]** * No, the Standby Hydraulic System would need to be activated either manually or automatically 22. **How do you manually activate the Standby Hydraulic System? [FCOM 13.20.5]** * Moving either FLT CONTROL A or B switch to the STBY RUD position or * Moving the ALTERNATE FLAPS Master switch to the ARM position 23. **What would cause the Standby Hydraulic System to automatically activate? [FCOM 13.20.5]** * Airborne or wheel speed greater than 60 kts and * Flaps extended and * Loss of Hydraulic System A or B and Main rudder PCU Force Fight Monitor (FFM) activates 24. **At a cruise altitude of FL350, if you see the Master Caution, FLT CONT annunciator and the STBY RUD ON lights illuminate, what happened? [FCOM 13.20.5]** * Standby Hydraulic System automatically activated by the main rudder PCU Force Fight Monitor (FFM) 25. **When does the STANDBY HYD LOW QUANTITY light illuminate? [FCOM 13.20.7]** * When the standby reservoir is approximately half empty 26. **What does the STANDBY HYD LOW PRESSURE (amber) light indicate and when is it armed? [FCOM 13.10.4]** * Output pressure of standby pump is low * Armed only when standby pump operation has been selected or automatic standby function is activated 27. **Which hydraulic system(s) are powering the elevator, ailerons, and rudder if the FLT CONTROL A switch is moved to STBY RUD?** * Elevator - B System * Ailerons - B System * Rudder - Standby System 28. **Will reverse thrust be available from both engines in the above scenario?** * Yes, the #1 reverser is pressurized by the Standby Hydraulic System 29. **If hydraulic system A and/or B fails, alternate operation for the affected Thrust Reverser can be provided by which Hydraulic System? [FCOM 7.20.12]** * Standby Hydraulic System