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TASK 27-41-00-700-804
6. Stabilizer Trim Wheel Free Movement Test
A. General
(1) Use this test to check the freeplay between the horizontal stabilizer trim motor and the
ballscrew.
B. References
Reference Title
24-22-00-860-811 Supply Electrical Power (P/B 201)
C. Location Zones
Zone Area
211 Flight Compartment - Left
212 Flight Compartment - Right
D. Prepare for the Test
SUBTASK 27-41-00-860-007
(1) Do this task: Supply Electrical Power, TASK 24-22-00-860-811.
SUBTASK 27-41-00-860-008
(2) Make sure that these circuit breakers are closed:
CAPT Electrical System Panel, P18-1
Row Col Number Name
C 2 C00849 AFCS STABILIZER TRIM
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
SUBTASK 27-41-00-860-009
(3) Make sure that the main cutout switch, S272, on the P8 panel, is in the NORMAL position.
SUBTASK 27-41-00-860-010
(4) Make sure that the STAB TRIM switch on the stab trim and cabin door panel, P8-47 is in the
NORMAL position.
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
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E. Procedure
SUBTASK 27-41-00-710-005
(1) Do the test of the stabilizer trim wheel free movement:
(a) Set the flaps to the 5-unit position.
1) Move and hold the STAB TRIM switches on the captain’s control wheel to the NOSE UP
position until the system comes to full trim speed.
a) Release the STAB TRIM switches. Make sure the stabilizer trim wheel continues to
move not more than 2.5 turns (900 degrees).
b) Make sure the reverse travel (APL NOSE DOWN) is not more than 27 degrees.
2) Move and hold the STAB TRIM switches on the captain’s control wheel to the NOSE
DOWN position until the system comes to full trim speed.
a) Release the STAB TRIM switches. Make sure the stabilizer trim wheel continues to
move not more than 2.5 turns (900 degrees).
b) Make sure the reverse travel (APL NOSE UP) is not more than 100 degrees.
(b) Set the flaps to the full up position.
1) Push and hold the STAB TRIM switches on the captain’s control wheel to the NOSE
DOWN position until the system comes to full trim speed.
a) Release the STAB TRIM switches. Make sure the stabilizer trim wheel continues to
move not more than 0.5 turns (180 degrees).
b) Make sure the reverse travel (APL NOSE UP) is not more than 65 degrees.
2) Push and hold the STAB TRIM switches on the captain’s control wheel to the NOSE UP
position until the system comes to full trim speed.
a) Release the STAB TRIM switches. Make sure the stabilizer trim wheel continues to
move not more than 0.5 turns (180 degrees).
b) Make sure the reverse travel (APL NOSE DOWN) is not more than 65 degrees.
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TASK 27-41-00-700-805
7. Stabilizer Trim Limit Switches Test
(Figure 504)
A. General
(1) Use this test to make sure the stabilizer trim limit switches operate correctly.
(2) The trim system can move the stabilizer to a position more than the limits that were set during
the adjustment of the limit switches. This condition is usual. Thus the "B" dimension tolerances
for the test are larger than the tolerance for the adjustment.
(3) This test is applicable only for limit switches S145, S844, S144.
B. References
Reference Title
24-22-00-860-811 Supply Electrical Power (P/B 201)
29-11-00-860-801 Hydraulic System A or B Pressurization (P/B 201)
29-11-00-860-805 Hydraulic System A or B Power Removal (P/B 201)
737-600/700/800/900
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EFFECTIVITY
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C. Tools/Equipment
NOTE: When more than one tool part number is listed under the same "Reference" number, the
tools shown are alternates to each other within the same airplane series. Tool part numbers
that are replaced or non-procurable are preceded by "Opt:", which stands for Optional.
Reference Description
SPL-1677 Assembly - Trammel Bar, Stabilizer Trim Actuator
(Part #: F80055-1, Supplier: 81205, A/P Effectivity: 737-100, -200,
-200C, -300, -400, -500, -600, -700, -700C, -700ER, -700QC, -800, -900,
-900ER, -BBJ)
D. Location Zones
Zone Area
211 Flight Compartment - Left
　
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