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Figure 402 (Sheet 2 of 4)/27-51-31-990-802
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN ALL; AIRPLANES WITH VERTICAL TORQUE TRIP
INDICATORS
27-51-31
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Inboard Flap Inboard Transmission Installation
Figure 402 (Sheet 3 of 4)/27-51-31-990-802
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN ALL; AIRPLANES WITH HORIZONTAL TORQUE TRIP
INDICATORS
27-51-31
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Inboard Flap Inboard Transmission Installation
Figure 402 (Sheet 4 of 4)/27-51-31-990-802
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
GUN ALL 27-51-31
Page 415
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TASK 27-51-31-400-802
5. Inboard Flap Inboard Transmission Installation
(Figure 402)
A. General
(1) This task is applicable to the transmissions at flap supports No. 4 and 5.
B. References
Reference Title
12-22-51-640-802 Inboard Flap Inboard Ballscrew 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)
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. 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
42 Ballscrew assembly 27-51-32-02-050 GUN 001-007, 155-157,
201-999
49 Transmission assembly 27-51-31-11-045 GUN 001-007, 155-157,
201-999
27-51-31-11-050 GUN 001-007, 155-157,
201-999
70 U joint assembly 27-51-24-04-010 GUN ALL
E. 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
541 Left Wing - Fairing Flap Support No. 4
641 Right Wing - Fairing Flap Support No. 5
F. Inboard Flap Inboard Transmission Installation
SUBTASK 27-51-31-420-005
(1) Install the transmission assembly [49]:
NOTE: The transmission assembly [49] weighs approximately 50 pounds (23 kilograms).
(a) Apply a thin layer of compound, C00913 to the mating surface of the transmission
assembly [49] and the transmission attach fitting [51].
(b) Apply a layer of compound, C00913 to the bolt holes in the transmission assembly [49].
(c) Apply a layer of compound, C00913 to the shank and threads of the bolts [60], bolt [64] and
bolt [65].
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AIRCRAFT MAINTENANCE MANUAL
EFFECTIVITY
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(d) Carefully lift the transmission assembly [49] to its position on the transmission attach fitting
[51].
(e) Install the bolts [60], bolt [64], bolt [65], washers [61], washers [62] and nuts [63] to attach
the transmission assembly [49] to the transmission attach fitting [51].
(f) Tighten the nuts [63] to 500-550 pound-inches (56.5-62.1 newton-meters) more than the runon
torque.
SUBTASK 27-51-31-420-006
(2) Connect the ballscrew assembly [42] to the yoke [53] on the transmission assembly [49]:
(a) Turn the ballscrew nut [55] until it is at the forward end of the ballscrew assembly [42].
(b) Apply a layer of grease, D00633 to the mating surfaces of the yoke [53] and the ballscrew
assembly [42].
(c) Put the ballscrew assembly [42] into the yoke [53].
(d) Apply a layer of grease, D00633 to the shank and threads of the bolts [56].
(e) Install the bolts [56], washers [57], washers [58] and nuts [59] to attach the ballscrew
assembly [42] to the yoke [53].
(f) Make sure the ballscrew assembly [42] is installed correctly in the yoke [53]:
1) Turn the transmission assembly [49] until the nut [50] on the U-joint [52] is up.
2) Turn the ballscrew nut [55] until the upstop is 1808 from the upstop [54] on the yoke [53].
3) If the ball returns on the ballscrew nut [55] are not in the correct position, then change
the position of the ballscrew assembly [42]:
　
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