G11313
Stabilizer Trim Control Switch Installation 500
27-41-111Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 15/70
C. Attach electrical cable to wire guide and pull cable through trim control switch hole and core of control wheel. Disconnect cable from guide.
CAUTION: DO NOT DAMAGE INSULATION. DO NOT PULL EXCESSIVELY AS WIRE CONNECTION AT SWITCH MAY BE DAMAGED.
D. Insert insulator between trim switch and interphone switch wires. (See figure 401.)
E. Pull electrical cable through control wheel until trim control switch and guard assembly can be seated in control wheel. Install pan head screws and tighten to 4 (+ 1/2) pound-inches torque. Verify a minimum of 0.002 inch clearance between control wheel handle and control switch. (See detail B.)
CAUTION: DO NOT OVERTORQUE SCREWS.
F. Remove insulation and install terminals on wires to fit terminals on terminal block. See figure 401 for color code identification of wires for terminal matching.
G. Attach control switch wires to terminal block per figure 401.
H. Close stabilizer trim control circuit breaker on panel P6.
I. Test switch installation. Refer to Stabilizer Trim Control Switch - Adjustment/Test.
J. Replace terminal block cover.
500
Feb 15/73 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 27-41-111 Page 403
STABILIZER TRIM CONTROL SWITCH - ADJUSTMENT/TEST
1. Stabilizer Trim Control Switch Test
A. Equipment and Materials
(1) Insulation tester
B. Test Stabilizer Trim Control Switch
(1)
Rotate aileron control wheel through 5 cycles of full travel 108 degrees each side of neutral.
(2)
Open STAB TRIM CONTROL circuit breaker on P6-2 panel.
(3)
Move STAB TRIM CUTOUT switch on control stand to CUTOUT position.
(4)
Airplanes without FDAU or DFDAU, Test all wires and switch for electrical insulation between wire and ground and electrical isolation between wires VIOLET to RED, VIOLET to ORANGE, VIOLET to BLACK-ORANGE, RED to BLACK-ORANGE, RED to ORANGE, and BLACK-ORANGE to ORANGE. Using insulation tester, test that all wires and switch have a resistance of 2 Megohms or greater. Airplanes with FDAU or DFDAU, Disconnect connector D1241A from M675 (FDAU/DFDAU). Perform wire and switch insulation/isolation between wires VIOLET to RED, VIOLET to ORANGE, VIOLET to BLACK-ORANGE, RED to BLACK-ORANGE, RED to ORANGE, and BLACK-ORANGE to ORANGE. Using insulation tester, test that all wires and switch have a resistance of 2 Megohms or greater. Reconnect D1241A to M675. Perform a visual check of D1241A and mating connector for bent and/or push back pins prior to reconnect.
NOTE: Some airplanes may not have the M675 interface (REF WDM 27-41-01, STABILIZER TRIM CONTROL) then perform 1.B(4) only.
(5)
Do the steps that follow to make sure you did not bend or damage the pins.
NOTE: This step is necessary because the pins are most likely to be damaged the first time an electrical connector is connected.
a) Disconnect the electrical connector. b) Make sure pins are not bent or damaged. c) Make sure electrical connector is not damaged.
NOTE: The pins can cause damage to the connector if the pins do not enter the electrical connector receptacles.
(6)
Move STAB TRIM CUTOUT switch to NORMAL position.
(7)
Provide electrical power.
(8)
Close stabilizer trim actuator and stabilizer trim control circuit breakers on panel P6.
(9)
Actuate stabilizer trim control switch to AIRPLANE NOSE UP and to AIRPLANE NOSE DOWN. Check that stabilizer responds in correct direction.
