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AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#Unpublished Work - See title page for details
(a) Put the lower pan [25] in its location on the flap control unit [23].
(b) Apply a layer of compound, C00913 to the shank and threads of the screws [24].
(c) Install the screws [24] to attach the lower pan [25].
SUBTASK 27-51-51-860-006
(18) Remove the safety tag and close this circuit breaker:
F/O Electrical System Panel, P6-2
Row Col Number Name
D 13 C00841 FLIGHT CONTROL ALTN T.E. FLAP DRIVE
H. Put the Airplane Back to Its Usual Condition
SUBTASK 27-51-51-440-001
(1) Do this task: Trailing Edge Flap System Reactivation, TASK 27-51-00-440-801.
SUBTASK 27-51-51-720-001
(2) Do this task: Flap Power Drive Unit Functional Test, TASK 27-51-51-000-802.
------------------------- END OF TASK ---------------------------
TASK 27-51-51-960-801
4. Flap Power Drive Unit Manual Drive Shearout Replacement
(Figure 401)
A. General
(1) The manual drive input on the power drive unit [21] has a shearout feature. The shearout is
designed to break if too much torque is applied to the manual drive.
B. References
Reference Title
27-51-00-040-801 Trailing Edge Flap System Deactivation (P/B 201)
27-51-00-440-801 Trailing Edge Flap System Reactivation (P/B 201)
27-51-00-980-801 Trailing Edge Flap System Manual Operation (P/B 201)
29-11-00-860-805 Hydraulic System A or B Power Removal (P/B 201)
C. Tools/Equipment
Reference Description
STD-1281 Screw - No. 6 (0.1380-32 UNC-2B) x 2 Inch Minimum Length,
(MS35649)
D. Consumable Materials
Reference Description Specification
C00913 Compound - Nondrying Resin Mix Corrosion
Inhibiting Material
BMS3-27
D00467 Fluid - Landing Gear Shock Strut BMS3-32, Type
II
D00633 Grease - Aircraft General Purpose BMS3-33
E. Expendables/Parts
AMM Item Description AIPC Reference AIPC Effectivity
5 Cover 27-51-55-02-110 GUN 001-028, 101-121,
155-157, 201-999
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
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(Continued)
AMM Item Description AIPC Reference AIPC Effectivity
30 Packing 27-51-55-02-115 GUN 001-028, 101-121,
155-157, 201-999
31 Shearout 27-51-55-02-130 GUN 001-028, 101-121,
155-157, 201-999
32 Retainer 27-51-55-02-130 GUN 001-028, 101-121,
155-157, 201-999
F. Location Zones
Zone Area
133 Main Landing Gear Wheel Well, Body Station 663.75 to Body Station
727.00 - Left
134 Main Landing Gear Wheel Well, Body Station 663.75 to Body Station
727.00 - Right
G. Prepare for the Removal
SUBTASK 27-51-51-040-002
(1) Do this task: Trailing Edge Flap System Deactivation, TASK 27-51-00-040-801.
SUBTASK 27-51-51-860-007
(2) Remove system B hydraulic power, do this task: Hydraulic System A or B Power Removal,
TASK 29-11-00-860-805.
H. Flap Power Drive Unit Manual Drive Shearout Replacement
SUBTASK 27-51-51-010-002
(1) Remove the manual drive cover [5] from the power drive unit [21]:
(a) Remove the bolts [29] and washers [28] that attach the manual drive cover [5].
(b) Remove the manual drive cover [5] from the power drive unit [21].
SUBTASK 27-51-51-020-008
(2) Remove the shearout [31] from the power drive unit [21]:
(a) Install a screw, STD-1281 in the threaded part of the shearout [31].
(b) Pull on the screw, STD-1281 to remove the shearout [31] with the retainer [32] from the
power drive unit [21].
NOTE: It will take approximately 30 pounds (130 newtons) of force to remove the
shearout [31].
SUBTASK 27-51-51-420-008
(3) Install a new shearout [31] in the power drive unit [21]:
(a) Put a new retainer [32] on the shearout [31].
(b) Apply grease, D00633 to the splines on the shearout [31].
(c) Use a 3/8-inch square drive to push the shearout [31] in the power drive unit [21] until you
feel the retainer [32] engage.
SUBTASK 27-51-51-710-001
(4) Use the manual drive to extend and retract the trailing edge flaps. To extend and retract the
flaps, do this task: Trailing Edge Flap System Manual Operation, TASK 27-51-00-980-801.
SUBTASK 27-51-51-410-002
(5) Install the manual drive cover [5] on the power drive unit [21]:
(a) Apply fluid, D00467 to the packing [30] on the manual drive cover [5].
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
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