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A 737-300/400/500MAINTENANCE MANUAL
FLAP CONTROL
TRAILING
EDGE FLAP
Trailing Edge Flap System Component Location
Figure 1 (Sheet 1)
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MACH TRIM SWITCH S290
FLAP 10-
DEGREE
SWITCH
S584
FLAPS UP LIMIT SWITCH S245
FLAPS DOWN LIMIT SWITCH S246
A
737-300/400/500MAINTENANCE MANUAL
LANDING WARNING SWITCH S138
WFFB CABLE
WFFA CABLE
TE FLAP BYPASS VALVETE FLAP CONTROL VALVE
FLAP LOAD LIMITER SOLENOID VALVE
FLAP CONTROL UNIT
LE FLAP
CONTROL VALVE
TAKEOFF WARNING
A
SWITCH S130 STALL WARNING S856
FLAP POSITION TRANSMITTER
B
Trailing Edge Flap System Component Location Figure 1 (Sheet 2)
FLAP ALTERNATE DRIVE UNIT
TORQUE TUBE
FLAP POWER UNIT
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A 737-300/400/500MAINTENANCE MANUAL
2. Trailing Edge Flap
__________________
A. Each trailing edge flap consists of a midflap with an attached hinged exhaust gate segment, a foreflap, and an aftflap. The three flap segments are mechanically separated during flap extension. Each trailing edge flap is supported by two flap carriages which travel on tracks mounted under the wing. The trailing edge flap is driven by two transmission assemblies attached to the midflap.
B. Inboard Midflap
(1)
The inboard midflap consists of ribs, three spars, a honeycomb trailing edge, and clad aluminum skins. A hinged exhaust gate segment is attached to the outboard aft edge of the midflap. Four tracks mounted on the rear spar of the midflap support the aftflap. A drive mechanism for the aftflap is contained in the midflap. An actuation mechanism for the exhaust gate is contained in the midflap.
(2)
The aftflap drive mechanism consists of a cable drum with cam slot, a bellcrank with cam follower, a slave bellcrank, two pushrods, an actuating mechanism boom, an actuating cable support fitting, and connecting cables (Fig. 2). The actuating mechanism boom, which pivots about a bracket on the inboard flap track, is not structurally attached to the midflap. The actuating cable support fitting is mounted on the inboard midflap carriage. The remaining components of the drive mechanism are contained in the midflap between the front spar and midspar. A cable mounted at each end of the boom passes over the actuating cable support fitting and attaches to the inboard cable drum. A cam follower on the inboard bellcrank rides in the cable drum cam slot. The slave bellcrank is connected to the inboard bellcrank by two cables. As the midflap moves, the aftflap drive mechanism is actuated by the change in relative position between the actuating mechanism boom and the actuating cable support fitting. The inboard bellcrank and slave bellcrank provide aftflap motion through the aftflap pushrods.
(3)
There is an exhaust gate actuation mechanism installed on the outboard end ot the inboard midflap (Fig. 3). As the midflap and the foreflap separate between the 25- and 40-unit position, the actuation mechanism opens the exhaust gate.
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