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4) Check the jackscrew for damage or cracking.
5) Move the stabilizer to a different position.
6) Repeat the steps above to examine the newly exposed threads of the jackscrew.
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7) If you find any problems listed above, replace the stabilizer jackscrew actuator:
(Stabilizer Ball Nut and Jackscrew Gearbox Removal, TASK 27-41-81-000-801)
(Stabilizer Ball Nut and Jackscrew Gearbox Installation, TASK 27-41-81-400-801).
8) For any grease removed from the Jackscrew prior to examining the threads for
damage, corrosion, and contamination, do the Stabilizer Trim Jackscrew Lubrication
step in: (Stabilizer Jackscrew, Ballnut and Gimbal - Lubrication,
TASK 12-22-41-600-801).
SUBTASK 27-41-81-410-003
(3) Close this access panel:
Number Name/Location
311BL Stabilizer Trim Access Door
------------------------- END OF TASK ---------------------------
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Stabilizer Ball Nut and Jackscrew Gearbox Visual Inspection
Figure 601 (Sheet 1 of 2)/27-41-81-990-804
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Stabilizer Ball Nut and Jackscrew Gearbox Visual Inspection
Figure 601 (Sheet 2 of 2)/27-41-81-990-804
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TASK 27-41-81-210-802
3. Stabilizer Jackscrew Gearbox Backlash Inspection
(Figure 602)
A. References
Reference Title
27-41-81-000-801 Stabilizer Ball Nut and Jackscrew Gearbox Removal (P/B 401)
27-41-81-400-801 Stabilizer Ball Nut and Jackscrew Gearbox Installation (P/B 401)
B. 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-1752 Equipment - Check, Jackscrew Backlash, Horizontal Stabilizer
(Part #: C27065-1, Supplier: 81205, A/P Effectivity: 737-600, -700,
-700C, -700ER, -700QC, -800, -900, -900ER, -BBJ)
STD-1238 Indicator - Dial
STD-1253 Pump - Hydraulic, Hand
C. Location Zones
Zone Area
311 Area Aft of Pressure Bulkhead - Left
D. Access Panels
Number Name/Location
311BL Stabilizer Trim Access Door
E. Procedure
SUBTASK 27-41-81-010-004
(1) Open this access panel:
Number Name/Location
311BL Stabilizer Trim Access Door
SUBTASK 27-41-81-860-004
(2) Move the stabilizer to 8.5 units of trim.
SUBTASK 27-41-81-860-005
(3) Set the STAB TRIM switches on the P10 Control Stand, to the CUTOUT position.
SUBTASK 27-41-81-860-006
(4) Open this circuit breaker and install safety tag:
F/O Electrical System Panel, P6-2
Row Col Number Name
B 10 C00207 FLIGHT CONTROL STAB TRIM CONT
SUBTASK 27-41-81-480-007
(5) Install equipment, SPL-1752 and dial indicator, STD-1238 on the jackscrew.
(a) Install the plate assembly of equipment, SPL-1752 on the jackscrew fitting with four screws.
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(b) Install the left and right bulkhead plate assembly of equipment, SPL-1752 to the bulkhead
stiffeners with four screws.
(c) Install the C-channel assembly of equipment, SPL-1752 to the left and right bulk head plate
assembly of equipment, SPL-1752 with two pins.
NOTE: The flat side of the C-channel assembly of equipment, SPL-1752 should point
forward.
(d) Hold the upper end of the jackscrew with both hands and turn clockwise and counterclockwise
to ensure the brake ratchet pawls are engaged.
NOTE: This will lock the jackscrew in place so that the jackscrew will not turn when the
load is applied.
(e) Install the hand hydraulic pump, STD-1253 to the clevis on the plate assembly of equipment,
　
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