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(f) Put the captain’s control column to the neutral detent.
(g) Set the STAB TRIM switch on the stab trim and cabin door, P8-47 module, to the NORM
position.
(h) Move and hold the STAB TRIM switches on the captain’s control wheel to the NOSE DOWN
position.
1) Make sure that the stabilizer leading edge moves up (STAB TRIM indicator movement
in the APL NOSE DOWN direction).
2) Pull the captain’s control column full aft.
3) Make sure the movement of the stabilizer stops.
4) Move and hold the STAB TRIM switches on the captain’s control wheel to the NOSE UP
position.
5) Make sure that the stabilizer leading edge moves down (STAB TRIM indicator
movement in the APL NOSE UP direction).
6) Release the STAB TRIM switches.
(i) Put the captain’s control column to the neutral detent.
(j) Set the STAB TRIM switch on the stab trim and cabin door, P8-47 module, to the OVERRIDE
position.
(k) Push the captain’s control column full forward.
(l) Move and hold the STAB TRIM switches on the captain’s control wheel to the NOSE UP
position.
1) Make sure that the stabilizer leading edge moves down (STAB TRIM indicator
movement in the APL NOSE UP direction).
2) Release the STAB TRIM switches.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN ALL 27-41-00
Page 535
Oct 10/2006
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
(m) Put the captain’s control column to the neutral detent.
(n) Set the STAB TRIM switch on the stab trim and cabin door, P8-47 module, to the NORM
position.
(o) Move and hold the STAB TRIM switches on the captain’s control wheel to the NOSE UP
position.
1) Make sure that the stabilizer leading edge moves down (STAB TRIM indicator
movement in the APL NOSE UP direction).
2) Push the captain’s control column full forward.
3) Make sure the movement of the stabilizer stops.
4) Move and hold the STAB TRIM switches on the captain’s control wheel to the NOSE
DOWN position.
5) Make sure that the stabilizer leading edge moves up (STAB TRIM indicator movement
in the APL NOSE DOWN direction).
6) Release the STAB TRIM switches.
(p) Put the captain’s control column to the neutral detent.
SUBTASK 27-41-00-780-002
(2) Do this task: Remove Pressure from the Elevator Hydraulic Systems A and B,
TASK 27-31-00-800-802.
------------------------- END OF TASK ---------------------------
TASK 27-41-00-700-808
10. Stabilizer Trim Secondary Brake System Test
(Figure 505)
A. General
(1) Use this test to make sure the stabilizer secondary brake can prevent movement of the
horizontal stabilizer.
B. Location Zones
Zone Area
211 Flight Compartment - Left
212 Flight Compartment - Right
311 Area Aft of Pressure Bulkhead - Left
312 Area Aft of Pressure Bulkhead - Right
C. Access Panels
Number Name/Location
311BL Stabilizer Trim Access Door
D. Prepare for the Test
SUBTASK 27-41-00-860-018
(1) Open these circuit breakers and install safety tags:
F/O Electrical System Panel, P6-2
Row Col Number Name
B 10 C00207 FLIGHT CONTROL STAB TRIM CONT
D 10 C00840 FLIGHT CONTROL STAB TRIM ACTUATOR
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN ALL 27-41-00
Page 536
Feb 10/2007
D633A101-GUN
BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
SUBTASK 27-41-00-010-005
(2) To get access to the stabilizer trim actuator, do this step:
Open this access panel:
Number Name/Location
311BL Stabilizer Trim Access Door
E. Procedure
SUBTASK 27-41-00-700-001
(1) Do the stabilizer trim secondary brake system test:
WARNING: MAKE SURE THAT ALL PERSONS AND EQUIPMENT ARE CLEAR OF THE
HORIZONTAL STABILIZER. THE HORIZONTAL STABILIZER WILL MOVE WHEN
YOU TURN THE JACKSCREW. THIS CAN CAUSE INJURIES TO PERSONS AND
DAMAGE TO EQUIPMENT.
CAUTION: IF MORE THAN 800 POUND-INCHES (90.4 NEWTON-METERS) OF TORQUE IS
APPLIED TO POST-SB 27-1210 BALLSCREW ACTUATOR ASSEMBLIES, DAMAGE
TO THE BALLSCREW ACTUATOR ASSEMBLY MAY OCCUR.
(a) Apply a 500 ±20 in-lb (56.5 ±2.3 N
m) counterclockwise torque to the upstop of the
jackscrew and hold.
NOTE: Make sure you do not put the torque on the safety rod nut.
1) While maintaining torque on the jackscrew, use a marker to make a line on the
jackscrew shield and the retainer - seal.
2) Release the torque.
CAUTION: IF MORE THAN 800 POUND-INCHES (90.4 NEWTON-METERS) OF TORQUE IS
APPLIED TO POST-SB 27-1210 BALLSCREW ACTUATOR ASSEMBLIES, DAMAGE
　
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