DS9 Document EFTA00593629

ESS DC OI Bus FLAP CONT FOR TRAINING PURPOSES ONLY MANUAL RAP CONT FLAP/STAB POS EMER • PEDESTAL SWITCHES FOLLOW UP SWITCHES -• FLAP INFORMATION EXT FLAP EMER FLAP CONTROL a HANDLE VALVE T A FLAP SHUTOFF VALVE (DEENERGIZEDCLOSED) FLAP CONTROL AUXILIARY RELAY PRESSURE COMBINED (OR UTILITY) PRESSURE FLAP POSITION TRANSMITTEFt LEGEND - - - MECHANICAL STAB/FLAP INDICATOR STABILIZER INFORMATION * BREAK CIRCUIT IF ACTUAL FLAP LINEAR TRAVEL EXCEEDS APPROX 1/4 INCH. ONE FROM THE OTHER Figure 27-37. Flap Control System Block Diagram C) C O O O O O a" 2 7 C „5. EFTA00593629 FlightSafety GULFSTREAM GIV/G300/6400 MAINTENANCE TRAINING MANUAL Central Gearbox The central gearbox is mounted on the forward upper end of the torque box in the main wheel well. The gearbox has an input shaft and four output shafts. The input shaft is driven by the hydraulic motor. The hydraulic motor is a fixed displacement motor operating at 6,000 rpm. This speed is reduced in the central gear- box at a ratio of 8.22 to 1. Torque is transmitted at a speed of 730 rpm to the spanwise torque shafts to drive the flaps and to drive the hor- izontal stabilizer. The fourth output is to the flap followup switch assembly and the posi- tion transmitter. Flap Control Handle The flap control handle is located on the right side of the center pedestal. It moves vertically into four detented positions: UP (0°), 10°, TAKEOFF/APPROACH (20°) and DOWN (39°). The emergency flap control handle is located on the copilot's side console. It is mechanically linked to the flap selector valve and is used as a manual override in the event of an electri- cal malfunction in the flap control valve. The handle moves vertically through three de- tented positions: UP, DOWN, and NEUTRAL. To operate the flaps with the emergency han- dle, move it in the desired direction and when the flaps reach the desired position return the handle to neutral. • Flap Selector Valve The flap selector valve is located in the nose wheel well, right side. It is a dual solenoid-op- erated valve. Solenoid "A" is energized for flaps up and solenoid "B" is energized for flaps down. The two positions provide re- versing hydraulic flow to the hydraulic motor for flap operation. The automatic stopping feature of the flaps is controlled by the flap fol- lowup switch assembly. When the flaps reach the desired position, one of the followup switches opens the electrical circuit to deen- ergize the respective solenoid valve. This results in the hydraulic motor stopping and the flaps being held in the desired position. If the selector valve solenoids fail, the emergency handle can be used to operate the valve. Flap Shutoff Valve The flap shutoff valve is located in the nose wheel well forward of the selector valve. It is a single solenoid valve that must be energized open. When energized, it will allow hydraulic fluid to the flap selector valve. It is energized whenever the flap control handle is moved. If the flap control circuit breaker should blow due to an electrical failure in the normal flap con- trol circuit, the valve can be energized through a separate circuit and the emergency flap con- trol handle can be used to move the flaps. Should a flap asymmetry occur during normal or emergency operation, the shutoff valve will be de-energized to prevent flap operation. NOTES FOR TRAINING PURPOSES ONLY 27-65 EFTA00593630 FlightSafety GULFSTREAM GIU/G300/6400 MAINTENANCE TRAINING MANUAL ELECTRICAL OPERATION Power for the flap control system is supplied by the FLAP CONT circuit breaker powered from the ESS DC bus. Additionally, the MAN- UAL FLAP CONT circuit breaker is powered through an integral switch in the FLAP CONT circuit breaker whenever it opens. The control system consists of four switches actuated by the flap control handle. Addi- tional control comes from the flap followup switch assembly. The assembly contains six flap position switches and five warning switches as well as control switches for other aircraft systems. These switches open and close as the flaps cycle through their range of 0 to 39°. As the flaps reach a selected position, the drive cam opens the particular switch, breaking•the circuit to the flap selector valve and halting flap movement. Of the six flap position switches, three control retraction and three control extension. UP (S1)—Retract 10° UP (S3)—Retract 10° Down (S4)—Extend 20° UP (S5)—Retract 20° DOWN (S6)—Extend DOWN (S2)—Extend The remaining switches in the assembly also open and close through the drive cam action in correspondence to flap position w allow cer- tain circuits to be completed. Landing Gear Warning Horn (S7)—Flaps equal to or greater than 22° Takeoff Alarm (S8)—Flaps full up or down Hydraulic Control (S9), not used Speedbrake/Flap Alarm (S 10)—Flaps any po- sition except up Flap/Stab Warning (S11)—Flaps full up, stab not at 1±1/4° AFGCS (S l2)—Flaps any position except up, not used NOTES FOR TRAINING PURPOSES ONLY 27-67 EFTA00593631