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U-Joint and Tee Angle Gearbox Lubrication, TASK 12-22-51-640-806.
G. Put the Airplane Back to Its Usual Condition
SUBTASK 27-51-55-440-001
(1) Do this task: Trailing Edge Flap System Reactivation, TASK 27-51-00-440-801.
SUBTASK 27-51-55-860-001
(2) Do this task: Supply Electrical Power, TASK 24-22-00-860-811.
SUBTASK 27-51-55-860-002
WARNING: KEEP PERSONS AND EQUIPMENT CLEAR OF THE FLIGHT CONTROL SURFACES, THE
THRUST REVERSERS, AND THE LANDING GEAR. THESE COMPONENTS CAN MOVE
SUDDENLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURIES TO
PERSONS AND DAMAGE TO EQUIPMENT.
(3) Supply system B hydraulic power, do this task: Hydraulic System A or B Pressurization,
TASK 29-11-00-860-801.
SUBTASK 27-51-55-710-001
(4) 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.
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(a) Make sure the pointers for the flap position indicators are in the 40-unit white band.
SUBTASK 27-51-55-710-002
(5) 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 27-51-55-860-003
(6) Remove system B hydraulic power, do this task: Hydraulic System A or B Power Removal,
TASK 29-11-00-860-805.
------------------------- END OF TASK ---------------------------
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MLG BEAM ANGLE GEARBOX - REMOVAL/INSTALLATION
1. General
A. This procedure has these tasks:
(1) A removal of the main landing gear beam angle gearbox
(2) An installation of the main landing gear beam angle gearbox.
B. The main landing gear beam angle gearbox is installed on the main landing gear beam between the
transmissions for the inboard flap.
TASK 27-51-56-000-801
2. Main Landing Gear Beam Angle Gearbox Removal
(Figure 401)
A. References
Reference Title
27-51-00-040-801 Trailing Edge Flap System Deactivation (P/B 201)
27-51-00-860-803 Extend the Trailing Edge Flaps (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. 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
D. Prepare for the Removal
SUBTASK 27-51-56-860-001
(1) Extend the trailing edge flaps to the 40-unit position. To extend them, do this task: Extend the
Trailing Edge Flaps, TASK 27-51-00-860-803.
SUBTASK 27-51-56-040-001
(2) Do this task: Trailing Edge Flap System Deactivation, TASK 27-51-00-040-801.
E. MLG Beam Angle Gearbox Removal
SUBTASK 27-51-56-020-001
(1) Disconnect the torque tubes [10] from the gearbox assembly [1]:
(a) Install clamp set, SPL-1726 on the torque tube [10] outboard of the gearbox assembly [1].
(b) Remove the screws [3] that attach the coupling sleeves [4] to the splined couplings [2].
(c) Move the coupling sleeves [4] off the splined couplings [2].
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SUBTASK 27-51-56-020-002
(2) Remove the angle gearbox assembly [1]:
(a) Remove the nuts [8], washers [7], washers [6] and bolts [5] that attach the gearbox
assembly [1] to the main landing gear beam [9].
(b) Remove the gearbox assembly [1].
------------------------- END OF TASK ---------------------------
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