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737-300/400/500MAINTENANCE MANUAL
 TRAILING EDGE FLAP POSITION INDICATING SYSTEM - DESCRIPTION AND OPERATION
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General
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 A.  The trailing edge flap position indicating system provides visible indication of the angular position of the trailing edge flaps. The synchro-type system consists of two position transmitter assemblies and one flap position indicator (Fig. 1). The flap position indicator shows angular position of the two outboard trailing edge flaps. Each position transmitter installation consists of a gearbox and a synchro-type transmitter. The gearbox is driven by the flap torque tubes and, in turn, rotates the transmitter shaft. This varies the electrical signal to the flap position indicator.
Flap Position Indicator
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 A.  A flap position indicator shows the position of the trailing edge flaps. It is a dual synchro-type indicator which registers flap position in units. The indicator receives 3-phase electrical signals from the two flap position transmitters and moves two pointers to indicate flap position. The flap position indicator is mounted on the center instrument panel in the control cabin (Fig. 1).
Flap Position Transmitter Assembly
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 A.  A flap position transmitter assembly relays the angular position of each outboard trailing edge flap to a position indicator in the cabin. The position transmitter assembly consists of a synchro-type transmitter mounted on a gearbox (Fig. 1). The gearbox contains a pair of spur gears driven by the outboard flap torque tubes. The pinion gear has splines at each end which are assembled with torque tube coupling halves. The output gear has an internal spline which drives the flap position transmitter mounted on the gearbox housing.
Operation
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 A.  During flap operation, the angular position of each trailing edge flap is indicated by a dual synchro-type indicator on the center instrument panel. A gear-driven position transmitter synchro relays flap position signals to the dual indicator synchros (Fig. 2). The position indicator needles move to reflect flap position. The position indicating system is driven by 28-volt ac power from the No. 2 transfer bus.
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A

737-300/400/500MAINTENANCE MANUAL
SEE A
SEE B
2 5
1
10
UP 15
FLAPS
25 30
40
NOTE: BLACK INDICATOR DIAL WITH WHITE MARKINGS REVERSED FOR CLARITY
POSITION INDICATOR A
FLAP POSITION TRANSMITTER
FWD INBD
OUTBOARD FLAP
TORQUE TUBE

GEARBOX
LEFT WING SHOWN-RIGHT WING OPPOSITE
B
Trailing Edge Flap Position Indicating System Component Location
Figure 1

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A 737-300/400/500MAINTENANCE MANUAL

Trailing Edge Flap Position Indicating System Circuit
Figure 2

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