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Stabilizer Trim Limit Switches Adjustment
Figure 501 (Sheet 2 of 5)/27-41-94-990-802
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Stabilizer Trim Limit Switches Adjustment
Figure 501 (Sheet 3 of 5)/27-41-94-990-802
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Stabilizer Trim Limit Switches Adjustment
Figure 501 (Sheet 4 of 5)/27-41-94-990-802
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Stabilizer Trim Limit Switches Adjustment
Figure 501 (Sheet 5 of 5)/27-41-94-990-802
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TASK 27-41-94-700-801
3. Stabilizer Trim Limit Switches Test
A. General
(1) The trim system can move the stabilizer to a position more than the limits that were set during
the adjustment of the limit switches because of the coasting. (Coasting occurs when power has
been removed from the stab trim actuator but the ballscrew is still moving as it comes to a stop.)
This condition is usual. Thus the "B" dimension tolerances for the test are larger than the
tolerance for the adjustment.
(2) This test is applicable only for limit switches S145, S844, and 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)
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
311 Area Aft of Pressure Bulkhead - Left
312 Area Aft of Pressure Bulkhead - Right
E. Access Panels
Number Name/Location
311BL Stabilizer Trim Access Door
F. Prepare for the Test
SUBTASK 27-41-94-860-005
(1) Do this task: Supply Electrical Power, TASK 24-22-00-860-811.
SUBTASK 27-41-94-860-006
(2) Make sure that these circuit breakers are closed:
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 27-41-94-860-007
(3) Make sure the main cutout switch, S272 is in the NORMAL position.
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SUBTASK 27-41-94-860-008
(4) Make sure the STAB TRIM switch on the stab trim and cabin door panel, P8-47 is in the NORMAL
position.
SUBTASK 27-41-94-860-009
(5) Make sure the flaps are in the full up position.
SUBTASK 27-41-94-010-003
(6) To get access to the limit switches, do this step:
Open this access panel:
Number Name/Location
311BL Stabilizer Trim Access Door
G. Stabilizer Trim Limit Switches Test
SUBTASK 27-41-94-710-004
(1) Do the test of the limit switch S844:
(a) Set the main cutout switch, S272, in the CUTOUT position.
(b) Use the stabilizer trim wheel to move the stabilizer to the maximum leading edge up (APL
NOSE DOWN) position.
(c) Set the main cutout switch, S272, in the NORMAL position.
(d) Turn the captain’s stabilizer trim wheel clockwise approximately 3 turns.
(e) Move and hold the STAB TRIM switches on the captain’s control wheel to the NOSE DOWN
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737-600-700-800-900 AIRCRAFT MAINTENANCE MANUAL飞机维护手册4(25)
