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GUN ALL 27-51-56
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MLG Beam Angle Gearbox Installation
Figure 401 (Sheet 1 of 2)/27-51-56-990-801
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
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MLG Beam Angle Gearbox Installation
Figure 401 (Sheet 2 of 2)/27-51-56-990-801
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
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TASK 27-51-56-400-801
3. Main Landing Gear Beam Angle Gearbox Installation
(Figure 401)
A. References
Reference Title
12-22-51-640-801 Trailing Edge Flap Torque Tube and Torque Tube Support
Lubrication (P/B 301)
27-51-00-440-801 Trailing Edge Flap System Reactivation (P/B 201)
27-51-00-820-802 Trailing Edge Flap Drive System Adjustment (P/B 501)
27-51-00-860-801 Trailing Edge Flap System Operation With Primary Control (P/B 201)
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-1726 Clamp Set - Trailing Edge Flap Torque Tube
(Part #: C27022-1, Supplier: 81205, A/P Effectivity: 737-600, -700,
-700C, -700ER, -700QC, -800, -900, -900ER, -BBJ)
C. Consumable Materials
Reference Description Specification
C00913 Compound - Nondrying Resin Mix Corrosion
Inhibiting Material
BMS3-27
D00633 Grease - Aircraft General Purpose BMS3-33
D. Expendables/Parts
AMM Item Description AIPC Reference AIPC Effectivity
1 Gearbox assembly 27-51-56-01-010 GUN ALL
27-51-56-01-015 GUN ALL
E. Location Zones
Zone Area
550 Subzone - Left Wing: Trailing Edge, Aft of Rear Spar, Inbd of
Outboard Trailing Edge Flap
553 Left Wing - Inboard Flap
650 Subzone - Right Wing: Trailing Edge, Aft of Rear Spar, Inboard of
Outboard Trailing Edge Flap
653 Right Wing - Inboard Flap
F. MLG Beam Angle Gearbox Installation
SUBTASK 27-51-56-420-001
(1) Install the angle gearbox assembly [1]:
(a) Apply a layer of compound, C00913 to the mating surface of the gearbox assembly [1] and
the landing gear beam [9].
(b) Put the angle gearbox assembly [1] in its position on the main landing gear beam [9].
(c) Apply compound, C00913 to the shank and threads of the bolts [5].
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
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(d) Install the bolts [5], washers [6], washers [7] and nuts [8] to attach the gearbox assembly [1]
to the main landing gear beam [9].
SUBTASK 27-51-56-420-002
(2) Connect the torque tubes [10] to the gearbox assembly [1]:
(a) Apply grease, D00633 to the coupling sleeves [4].
(b) Put the splined couplings [2] in the coupling sleeves [4].
(c) Install the screws [3] to attach the torque tubes [10] to the gearbox assembly [1].
(d) Install lockwire on the screws [3].
(e) Remove the clamp set, SPL-1726 from the torque tube [10] outboard of the gearbox
assembly [1].
SUBTASK 27-51-56-820-001
(3) If the torque tubes [10] moved, while they were disconnected, do this task: Trailing Edge Flap
Drive System Adjustment, TASK 27-51-00-820-802.
SUBTASK 27-51-56-600-001
(4) Lubricate the torque tubes [10]. To lubricate the torque tubes [10], do this task: Trailing Edge
Flap Torque Tube and Torque Tube Support Lubrication, TASK 12-22-51-640-801.
G. Put the Airplane Back to Its Usual Condition
SUBTASK 27-51-56-440-001
(1) Do this task: Trailing Edge Flap System Reactivation, TASK 27-51-00-440-801.
SUBTASK 27-51-56-710-001
(2) Use the primary system to retract the flaps to the UP position, do this task: Trailing Edge Flap
System Operation With Primary Control, TASK 27-51-00-860-801.
(a) Make sure the pointers for the flap position indicators are in the UP white band.
SUBTASK 27-51-56-710-002
(3) Use the primary system to extend the flaps to the 40-unit position, do this task: Trailing Edge
Flap System Operation With Primary Control, TASK 27-51-00-860-801.
(a) Make sure the pointers for the flap position indicators are in the 40-unit white band.
　
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