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COMPONENTS AND OPERATION The flap power unit (FPU) is located aft of the wing center section behind the wing attachment fitting and contains the hydraulic motor, servo control valve, arming solenoid valve and pressure switch. The servo valve responds to electrical signals from the flap control unit and meters hydraulic pressure to extend or retract the bidirectional hydraulic motor. The arming solenoid valve must be opened by the flap control unit before hydraulic pressure is available to the servo valve. The pressure switch monitors system pressure between the arming solenoid valve and servo valve. If hydraulic pressure is not available on flap selection, flaps are inoperative. If the FPU detects a fault, the flaps may deploy at a reduced speed when selected and FLAPS RATE LOW CAS will illuminate. Stainless steel shafts routed along the rear wing spar transmit the rotary motion of the flap power unit to the input shaft of each of the flap actuators. Two rotary variable differential transformers (RVDTs) mounted on the outboard side of each outboard flap actuator provide position information to the flap control unit (FCU) and the flap position indicating unit. The flap actuators incorporate a screw jack and are attached to the rear spar. These actuators convert the rotary input motion into linear output motion through these screw jacks, driving the flaps. Each actuator has overtravel end stops. The screw jack design of the flap actuators prevents uncommanded retraction due to airloads or vibration. The flap control unit (FCU) performs the following functions: -Controls flap panel movement according to pilot commands -Monitors critical system conditions (runaway/uncommanded movement, surface asymmetry, system jam, over- speed and speed differential) -Switches the system to fail safe condition after detection of a critical failure -Monitors FPU for internal and external hydraulic leakage and provide annunciation to the aircrew -Flap position to the stall protection system -Provides data for cockpit indication and for maintenance purposes In addition to control and monitoring, the FCU also contains the left hand and right hand flap position indication unit (FPIU) and provides flap panel position to the EICAS FLAP ALERTING The flap position alerting system is monitored by airspeed, flap position, spoiler, gear position, and altitude. An overspeed warning horn is activated if flaps are extended above the following speed: -VFE 210 kt — 10° -VFE 210 kt — 20° -VFE 175 kt — 30° Volume 2 Flight Crew Operating Manual Sep 13/2004 CSP 100-6 REV 1 10-02-06 SECONDARY FLIGHT CONTROLS (Cont) FLAP CONTROL LEVER |
