3) Install the washer and switch arm nut on the switch shaft. a) Tighten the nut by hand.
NOTE: You will tighten the switch arm nut after you
____ adjust the switch.
(c)
Connect the switch wires at the wire connection.
(2)
Close the access door 3701 (AMM 12-31-41/201).
S 864-006
(3)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a)
P6-2 Circuit Breaker Panel
1) STABILIZER TRIM CONT
2) AURAL WARN, if it is open
S 414-009
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A 737-300/400/500MAINTENANCE MANUAL
(4) S 824-005Do this task: "Stabilizer Trim Limit Switch Adjustment" (AMM 27-41-94/501).
(5) S 714-004Do this task: "Stabilizer Trim Limit Switch Test" (AMM 27-41-94/501).
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A 737-300/400/500MAINTENANCE MANUAL
STABILIZER TRIM LIMIT SWITCHES - ADJUSTMENT/TEST
________________________________________________
1. General
_______
A. This procedure has two tasks, one for the adjustment and one for the operational test of the stabilizer trim limit switches S115, S145, S844 (which is referred to as the "limit switch"). The purpose of these limit switch tests is to ensure that there are a minimum of three turns of stabilizer trim wheel adjustment between the electrical cutout of the limit switches and the mechanical stops of the ballscrew. This ensures that there is enough ballscrew travel after limit switch cutout so that contact of the stops does not occur during system coastdown. The procedure has these parts:
(1)
The adjustment of the limit switch
(2)
The operational test of the limit switch. ú B. Refer to AMM 22-11-00/501 for the test of the limit switch S144. ú C. Refer to AMM 22-11-00/501 or AMM 22-11-01/501 for the test of the limit ú switch S144.
D.
Refer to AMM 31-26-00/501 for the adjustment and test of the stabilizer takeoff warning switches S132 and S546.
TASK 27-41-94-825-001
2. Stabilizer Trim Limit Switches Adjustment (Fig. 501)
_________________________________________
A. Special Tools and Equipment
(1)
F80055-1 - Actuator Trammel Bar
B.
References
(1)
AMM 12-31-41/201, Body Section 48 Access Doors and Panels
C.
Access
(1)
Location Zone
701 Tail Compartment
(2)
Access Panels
3701 Stabilizer Trim Access Door
D.
Procedure
S 015-007
(1)
Open the access door 3701 (AMM 12-31-41/201).
(2)
Use the trammel bar to set the necessary B dimension (Table I).
S 825-009
(3)
Adjust the switch arm:
(a)
Loosen the lockscrew.
(b)
Turn the worm gear until the switch starts to operate (when you hear a click).
(c)
Tighten the lockscrew.
(d)
Install a lockwire on the lockscrew.
S 865-008
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A 737-300/400/500MAINTENANCE MANUAL
STABILIZER DOWN
STABILIZER UP
SEE A
TABLE I
UNITS
SWITCH OF
TRIM
STAB AUTOPILOT AND
PSTA LIMIT SWITCH
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