(a)
Make sure that the voltage on pin 6 is more than 2 VAC.
S 865-018
(7)
Release the stab trim switches.
S 865-019
(8)
Open this circuit breaker and attach a DO-NOT-CLOSE tag:
(a)
Circuit Breaker Panel, P6-2
1) STAB TRIM ACTUATOR
S 765-020
WARNING: BE SURE NOT TO TOUCH ADJACENT PINS IN CONNECTOR D700 DURING
_______ VOLTAGE CHECKS. THE 115 VAC IN THE CONNECTOR CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(9)
Use a multimeter to measure the voltage on connector D700 between pin 8 and the surrounding structure.
(a)
Make sure that the voltage on pin 8 is less than 2 VAC.
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737-300/400/500MAINTENANCE MANUAL
S 865-021
(10) Move the stab trim switches on the control wheel to the NOSE UP position and hold.
NOTE: The same stab trim switches (captain's or first officer's)
____
should be used during this procedure.
S 765-039
WARNING: BE SURE NOT TO TOUCH ADJACENT PINS IN CONNECTOR D700 DURING
_______ VOLTAGE CHECKS. THE 115 VAC IN THE CONNECTOR CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(11)
Use a multimeter to measure the voltage on connector D700 between pin 7 and the surrounding structure.
(a)
Make sure that the voltage on pin 7 is less than 2 VAC.
S 865-023
(12)
Release the stab trim switches.
S 865-024
(13)
Move the stab trim switches on the control wheel to the NOSE DN position and hold.
S 765-025
WARNING: BE SURE NOT TO TOUCH ADJACENT PINS IN CONNECTOR D700 DURING
_______ VOLTAGE CHECKS. THE 115 VAC IN THE CONNECTOR CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(14)
Use a multimeter to measure the voltage on connector D700 between pin 6 and the surrounding structure.
(a)
Make sure that the voltage on pin 6 is less than 2 VAC.
(15)
Release the stab trim switches.
S 425-027
(16)
Connect the D700 connector to the stabilizer trim motor M1659 (Fig. 501).
S 865-026
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ú 02 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. Page 506Nov 12/00
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737-300/400/500MAINTENANCE MANUAL
S 815-028
(17)
Clear the internal monitoring faults of the stabilizer trim motor, if any, by doing the following steps:
(a)
Open this circuit breaker:
1) Circuit Breaker Panel, P18-1
a) STABILIZER TRIM
(b)
Wait a minimum of 5 seconds.
(c)
Close this circuit breaker:
1) Circuit Breaker Panel, P18-1
a) STABILIZER TRIM
S 865-029
(18)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
Circuit Breaker Panel, P6-2
1) STAB TRIM CONT
2) STAB TRIM ACTUATOR
S 715-030
(19)
Do a test of the high (flaps down) stabilizer trim rate:
(a)
Move the stab trim switches on the control wheel to the NOSE UP (stabilizer leading edge down) position and hold until the stabilizer stops.
(b)
Do the following to measure the time it takes for the stabilizer to move from the leading edge down position to the leading edge up position. 1) Move the stab trim switches on the control wheel to the
NOSE DOWN position and hold until the stabilizer stops. 2) Make sure that the time from the start to stop of stabilizer movement is between 17 and 24 seconds.
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