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Trailing Edge Flaps Primary Drive Schematic
Figure 3 (Sheet 1)
TO LANDING GEAR SELECTORVALVE
P
SHUTOFF INPUT FROMFLAP DRIVE OPERATEDFOLLOW-UP CAM
POWER
TRANSFER
UNIT
NORMAL
LEFT
HYDRAULIC
POWER
SYSTEM
SHUTOFF
TE FLIP BYPASS VALVE
TO FLAP/SLATDEPRESSURIZATION
SOLENOID PILOT
FLAP LOAD RELIEF
VALVE
SOLENOID
FLAP/SLAT DEPRESS-T E FLAP CONTROL VALVE MODULEURIZATION MODULE
T E FLAPSEXTEND HYDRAULIC MOTORMOTOR
PORT XRETRACT
FLAP
CASE DRAINALT DRIVE
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Trailing Edge Flaps Primary Drive Schematic
Figure 3 (Sheet 2)
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MAINTENANCE MANUAL
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FSEU-1
Trailing Edge Flap Alternate Drive System Schematic
Figure 4 (Sheet 2)
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(3)
(4)
(5)
(6)
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MAINTENANCE MANUAL
(b)
The flap system is controlled electrically by a rotary position switch and the trailing edge arming switch.
(c)
The arming switch moves both flap and slat bypass valves to the bypass position and closes the flap/slat depressurization valve to remove hydraulic pressure from the high lift hydraulic system.
(d)
The rotary selector switch commands a closed loop electrical system that selects the same seven flap positions as the hydraulic control system. Rotary selector switch position is monitored by FSEU-2 and FSEU-3. FSEU-3 generates signals to close extend or retract relays which power the PDU electric motor and engergize the electric motor clutch.
(e)
A position transmitter on the PDU sends flap position data to FSEU-3. The FSEU uses this data to control alternate motor operation. When the flaps reach the commanded position the drive relays are opened, the clutch is released, and the alternate drive motor stops.
Primary Power
(a)
The left hydraulic system provides primary power to the flap drive system.
(b)
In the event of a left engine failure, the flaps and slats, as well as the landing gear, are powered by the power transfer unit (PTU). The PTU consists of a hydraulic motor which drives a hydraulic pump. The PTU motor is powered by the right hydraulic system and the PTU pump provides left hydraulic system pressure.
Alternate Power
(a)
The flaps are driven by an electric motor in the alternate control mode. The electric motor runs on 3-phase, 400 Hz, 115-volt AC current provided by the right AC bus.
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