(4)
Remove bolt attaching flexible shaft (8) to brake override lever (9).
(5)
Push brake override lever full forward and push stabilizer brake release handle on control stand down.
(6)
Adjust flexible shaft to match override lever. Attach shaft and lever together with mounting screw, washer, nut, and cotter pin.
(7)
Remove rigging pins from brake arm and elevator quadrant, and close lower nose compartment access door 1103.
(8)
Test stabilizer trim brake per par. 2.A.
501
Feb 20/88 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 27-41-51 Page 501
G10824G10827
Stabilizer Trim Brake Assembly Installation 500
27-41-51 Figure 501 Jun 20/86
Page 502
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500 Forward Elevator Control Quadrant
Feb 15/73 Figure 502 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 27-41-51 Page 503
2. Stabilizer Trim Brake Test
A. Test Stabilizer Trim Brake
NOTE: If brake test is part of a general functional test of entire stabilizer trim system, accomplish functional test per 27-41-0 A/T.
(1)
Check that rigging pin ST-2 is removed from brake arm on stabilizer trim brake.
WARNING: DO NOT MOVE CONTROL COLUMN WITH RIGGING PIN ST-2 INSTALLED. DAMAGE MAY OCCUR TO BRAKE LEAF SPRINGS. A DEFORMED LEAF SPRING MAY RESULT IN UNWANTED ENGAGEMENT OF COLUMN ACTUATED STABILIZER TRIM BRAKE.
(2)
Operate stabilizer trim wheel in AIRPLANE NOSE UP direction, and while rotating trim wheel, push control column forward until brake prevents rotation of trim wheel.
(3)
With control column held in position preventing AIRPLANE NOSE UP trim, check that stabilizer trim wheel is operable in AIRPLANE NOSE DOWN direction.
(4)
Return control column to neutral and check that stabilizer trim wheel is operable in both directions.
(5)
Operate stabilizer trim wheel in AIRPLANE NOSE DOWN direction, and while rotating trim wheel pull control column aft until brake prevents rotation of trim wheel.
(6)
With control column held in position preventing AIRPLANE NOSE DOWN TRIM, check that stabilizer trim wheel is operable in AIRPLANE NOSE UP direction.
(7)
Return control column to neutral and check that stabilizer trim wheel is operable in both directions.
(8)
Pull stabilizer brake release handle and push control column full forward. Check that stabilizer trim wheel is operable in both directions.
(9)
Pull stabilizer brake release handle and pull control column full aft. Check that stabilizer trim wheel is operable in both directions.
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STABILIZER TRIM CONTROL CABLES - REMOVAL/INSTALLATION
1. General
A. To remove a stabilizer trim control cable, it is necessary to position the stabilizer to either extreme end of travel to minimize the amount of cable on the jackscrew gearbox cable drum. Cable tension is released and the cable guards are removed for access to the cable terminal. The forward end of the cable at the forward drum is removed, the stabilizer is manually operated in the opposite direction, and the cable is pulled as it unwinds from the aft drum. Then the aft end of the cable is disconnected from aft drum and the cable removed. Refer to Chapter 20, Control Cables, for cable removal and installation. Refer to 27-09-111 for cable lengths and fittings.
NOTE: Make note of cable left on drum before disconnecting cable ends. (Number of turns and/or fractions of turns.) Approximately the same amount o f cable should be installed on drum when replacing cable. A 50-pound force may be applied to the stabilizer trim control wheel to attach STB cable eye to front drum.
501
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STABILIZER TRIM ELECTRIC ACTUATOR - REMOVAL/INSTALLATION
1. Remove Stabilizer Trim Electric Actuator
A. Open stabilizer trim access door 3701.
B. Open stabilizer trim actuator and stabilizer trim control circuit breakers on panel P6.
C. Remove electrical connector from actuator (Fig. 401).
D. Remove three mounting bolts attaching actuator to jackscrew gearbox.
E. Remove actuator.
F. Cover mounting pad to prevent foreign matter from entering jackscrew gearbox.
2. Install Stabilizer Trim Electric Actuator
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