(3)
Position cam follower bearings with bushings in installed position.
(4)
Secure cam follower bearings to toggle assembly with washers and nuts. Tighten nuts to 95-110 pound-inches.
(5)
Install cotter pins.
C. Position toggle assembly so that forward cam follower bearings can be installed.
(1)
Coat threads and shank of cam follower bearings with BMS 3-24 grease prior to installation.
(2)
Install bushings on shanks of the cam follower bearings.
(3)
Position forward cam bearings with bushings in installed position.
(4)
Secure forward cam bearings to toggle assembly with washers and nuts. Tighten nuts to 95-110 pound-inches.
(5)
Install cotter pins.
D. Grease cam follower bearings and track roller bearing with MIL-G-23827 (Ref 12-22-41).
5. Restore Airplane to Normal
A. Provide system A hydraulic power (Ref 27-51-00 MP).
B. Position flap control lever to FLAP UP detent.
C. Remove system A hydraulic power (Ref 27-51-00 MP).
D. Install inboard flap track fairing (Ref 27-51-141 R/I).
500
27-51-361 Page 404 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 20/90
TRAILING EDGE FLAP POSITION INDICATING SYSTEM - DESCRIPTION AND OPERATION
1. General
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 electric signal to the flap position indicator.
2. Flap Position Indicator
A. A flap position indicator shows the position of the trailing edge flaps. It is a dual synchro-type indicator that registers flap position in units. The indicator receives 3-phase electric 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).
3. Flap Position Transmitter Assembly
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 that drives the flap position transmitter that is mounted on the gearbox housing.
4. Operation
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.
516
Aug 15/77 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 27-58-01 Page 1
G27289G27335
Trailing Edge Flap Position Indicating System Component Location 518
27-58-01 Figure 1 Feb 15/78
Page 2
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
558 Trailing Edge Flap Position Indicating System Circuit
May 15/77 Figure 2 27-58-01
Page 3
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
TRAILING EDGE FLAP POSITION INDICATING SYSTEM - TROUBLE SHOOTING
1. General
A. All trouble shooting procedures are based on the assumption that wiring is OK and that electrical power is available. If corrective action in the procedure does not correct the problem, check wiring using the wiring diagram.
B. The trailing edge flap system must be properly adjusted prior to trouble shooting the trailing edge flap position indicating system.
2. Prepare for Trouble Shooting
A. Provide electrical power.
B. Check that TRAILING EDGE FLAP POS IND circuit breaker is closed.
C. Check that FLAP SHUT-OFF VALVE circuit breaker is closed.
D. Provide system A hydraulic power (Ref 27-51-0, Maintenance Practices).
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