FLAP SYSTEM ELECTRONICS.pdf

GULFSTREAM G650ER SYSTEM DESCRIPTION MANUAL FLAP SYSTEM ELECTRONICS — SYSTEM DESCRIPTION 1. General A. Description NOTE: The following paragraphs are used in conjunction with Figure 1. The Flap Electronic Control Unit (FECU) is an electronic controller with a command / monitor architecture that prov...

GULFSTREAM G650ER SYSTEM DESCRIPTION MANUAL FLAP SYSTEM ELECTRONICS — SYSTEM DESCRIPTION 1. General A. Description NOTE: The following paragraphs are used in conjunction with Figure 1. The Flap Electronic Control Unit (FECU) is an electronic controller with a command / monitor architecture that provides control of the flap actuation system. The FECU provides data to the Flight Control Computers (FCCs) using an ARINC 429 (A429) bus and is electrically bonded to the aircraft structure through the FECU mounting tray. The FECU interfaces with the following devices: Flap handle Flap Hydraulic Control Module (HCM) Flap actuator position resolvers NOTE: The FCCs do not provide direct control data to the flaps. The flap handle is part of the Flap Control Module (FCM). The pilot manually adjusts the flap handle to position the left and right flaps. If the flap handle is out of detent for more than 5 seconds, a CAS message alerts the pilot to place the flap handle in a detent position. 2. Component Location COMPONENT ATA QTY PER A/C LOCATION Flap control module 27-55-01 1 Pedestal Flap electronic control unit 27-55-03 1 REER Flap hydraulic control module 27-55-05 1 Main wheel well 3. Component Details A. Flap Control Module The FCM provides the interface for the pilot to select the desired flap position. The FCM contains four discrete detent positions corresponding to flap 0, flap 10, flap 20 and flap 39. The detent positions are machined into a detent plate that is fastened to the FCM chassis. The flap handle is set in a detent position by a locating pin that is spring loaded to maintain the selected detent position. A friction pack provides tactile feedback to the pilot. In the event of a locating pin failure, the friction pack will maintain the last commanded flap position. The friction pack is factory adjustable to allow control of the force required to move the flap handle. The FCM contains three discrete switches that are monitored by the FCC. The FCC compares switch positions to a predetermined logic to determine if the switches are valid. A valid discrete switch position is provided to the FECU for use in determining valid flap commands. The FCM contains two single channel RVDTs geared to the flap handle. The RVDTs provide flap handle position feedback to the FECU for use in determining valid flap commands. The RVDTs are not replaceable components. The FCM contains an Edge Lit Panel (ELP). The ELP provides lighted indication for operations in low light conditions. The ELP provides FCM identification and detent position indications. (1) Alternate Flap Arm Switch 27-55-00 Page 1 August 15/14 GULFSTREAM G650ER SYSTEM DESCRIPTION MANUAL The alternate flap arm switch (marked GPWS / GND SPLR / FLAP ORIDE) is a manually operated switch located in the pedestal. When prompted, the pilot / copilot selects the switch to change the operating mode from normal to alternate. By selecting the switch, the normal FECU channel is simultaneously deactivated and the alternate channel activated. The alternate flap arm switch interfaces with the FECU. The FECU monitors the switch change of state (Open / GND) and changes the mode of operation from normal to alternate. B. Flap Electronic Control Unit To ensure flap actuation system availability and integrity, the FECU consists of two independent channels, normal and alternate channel. The flap actuation system is designed to operate in the normal mode and is always active. The alternate channel is not powered unless manually activated by the pilot / copilot. The alternate flap arm switch is used to activate the alternate channel. (1) Flap Electronic Control Unit Normal Channel The FECU normal channel features two processor based lanes, command and monitor, ensuring flap actuation system integrity. Each channel excites and demodulates one of the flap handle position sensors. The flap handle position is monitored by two RVDTs. The FECU normal channel provides excitation to the flap handle RVDT position sensors and monitors the flap handle position. Both the command and monitor paths shall agree on a valid commanded position before flap movement is allowed. The FECU determines that the command and flap actuation system integrity are valid. The FECU normal command and monitor lanes, each excites and demodulates one of the flap handle position sensors. Both the command and monitor paths shall agree on a valid commanded position before flap movement occurs. If the FECU normal channel fails, a momentary loss of control of the flaps will occur. The flaps remain in the last commanded position. The failure is annunciated to the flightcrew and the pilot activates the alternate flap arm switch. Activation of the alternate flap arm switch disables the normal channel until the flap arm switch is deactivated. (2) Flap Electronic Control Unit Alternate Channel The alternate channel consists of fully analyzable and testable analog and digital circuitry with no software and programmable logic. When the alternate channel is active, the normal channel is disabled. The FECU alternate channel provides flap control if any of the following normal channel failures occurs: Flap handle sensor failure Command lane failure Monitor lane failure Power loss in command or monitor lanes The FECU alternate channel reads the flap handle position from four flap handle detent discrete switches and has the following functions: Enables flap movement when the flap handle is moved, provided the flap position sensor readings are valid Performs flap position and rate closed-loop control, based on the left and right outboard actuators position sensors feedback signals Energizes and de-energizes the HCM Solenoid Operated Valve (SOV) alternate coil Provides current commands to the HCM Electro-hydraulic Servo Valve (EHSV) alternate coil Monitors agreement between the left and right outboard actuator position sensors 27-55-00 Page 2 August 15/14 GULFSTREAM G650ER SYSTEM DESCRIPTION MANUAL NOTE: When monitoring left and right outboard actuator position sensors, the alternate channel uses analog signals provided by the normal channel command and monitor lanes. C. Flap Hydraulic Control Module The HCM is installed near the Power Drive Unit (PDU) in the main wheel well and responds to electrical commands received from the FECU. The HCM interfaces with the aircraft left hydraulic system and provides directional control, extend / retract and low / high speed rate control to the flap system PDU. The HCM manifold houses one solenoid operated SOV and one EHSV). Both valves are controlled by electrical commands from the FECU. The HCM SOV stops hydraulic flow when not energized. 4. Controls and Indications A. Circuit Breakers The system is protected by the following circuit breakers: NOMENCLATURE PANEL LOCATION POWER SOURCE FLAP MON REER A8 R ESS 28VDC FLAP CMD LEER A10 L ESS 28VDC B. CAS Messages The CAS messages for the system are shown in the following table: MESSAGE COLOR MESSAGE DESCRIPTION Flaps Asymmetry Amber Flap position asymmetry detected. Flaps have stopped moving toward selected position. Plan for landing with reduced flap setting. Flap Command Invalid Amber Flap handle is placed or jammed in an invalid position. Reposition flap handle to valid position. Flaps Failed Amber No surface movement when flap handle is commanded or surface movement in opposite direction or uncommanded flap surface movement. Place handle to previous position, reduce airspeed and reset handle to desired position. If flap operation not recovered, plan for landing with reduced flap setting. Uncommanded Flaps Amber Flaps are not commanded. NOTE: The FCC status information required by the flightcrew is shown on the main displays as CAS messages and synoptic page data. 5. Operation A. Flap System Electronics The pilot / copilot initiate flap deployment commands using the FCM. Flap deployment and rate depends on the commands given and on the EHSV command current magnitude. The EHSV 27-55-00 Page 3 August 15/14 GULFSTREAM G650ER SYSTEM DESCRIPTION MANUAL provides direction and flow control to the PDU. The SOV opens when the FECU energizes the solenoid coil with 28 Vdc. When open, the valve allows hydraulic flow and pressure supply to the EHSV. 27-55-00 Page 4 August 15/14