(a)  
Tighten the No. 1 and 3 housing bolts to 50-70 pound-inches.

 (b)  
Tighten the No. 2 bolt to 63-77 pound-inches.

 S 424-016
 (5)  
Attach the torque tubes to the right angle gearbox (Fig. 401):

 (a)  
Apply a layer of the grease to the torque tube couplings on the right angle gearbox.

 (b)  
Engage the torque tube sleeves with the couplings on the gearbox.

 (c)  
Install the retention screws.

 (d)  
Install the lockwire on the screws.

 (e)  
Remove the support from the flaps.

 (6)  
Supply hydraulic system B power (Ref 27-51-00/201).

 S 864-011
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737-300/400/500MAINTENANCE MANUAL
 (7)  S 714-012Move the flap control lever to make sure the gearbox operates correctly.
 (8)  S 864-013Put the flap control lever to the UP detent to retract the flaps.
 (9)  S 864-014Remove the hydraulic system B power (Ref 27-51-00/201).
 S 414-015

 (10) Install the inboard flap track fairing (Ref 27-51-32/401).

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737-300/400/500MAINTENANCE MANUAL
 FLAP ANGLE GEARBOX - REMOVAL/INSTALLATION
_________________________________________
 1.  General_______
 A.  There are two tasks in this procedure. There is a task for the removal and a task for the installation of a flap angle gearbox.
 TASK 27-51-69-004-001
 2.  Flap Angle Gearbox Removal (Fig. 401)__________________________
 A.  References
 (1)
27-51-00/201, Trailing Edge Flap System

 B.  
Access

 (1)  
Location Zone 309, 409 Wing Trailing Edge Inboard Flap and Spoilers

 C.  
Procedure

 S 864-002
 (1) Supply the hydraulic system B power (Ref 27-51-00/201).
TORQUE TUBE COUPLING SLEEVES
MOUNTING BOLTS (3 LOCATIONS)
LANDING GEAR BEAM
SEE  A
FLAP ANGLE GEARBOX
FWD INBD
TORQUE TUBE COUPLING SLEEVES
A
Flap Angle Gearbox Installation Figure 401
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A 737-300/400/500MAINTENANCE MANUAL
 S 864-004
 (2)  
Put the flap control lever in the 40-unit detent to extend the flaps.

 S 864-003

 (3)  
Remove the hydraulic system B power (Ref 27-51-00/201).

 S 034-005

 (4)  
Disconnect the torque tubes from the flap angle gearbox:

 (a)  
Install a support to hold the flaps while the torque tubes are disconnected.

 (b)  
Remove the screws that attach the coupling sleeves for the torque tube to the couplings on the flap angle gearbox.

 (c)  
Move the coupling sleeves off the couplings to disconnect the torque tubes.

 S 024-006
 (5)  
Remove the flap angle gearbox:

 (a)  
Remove the three bolts that attach the gearbox to the landing gear beam.

 (b)  
Remove the gearbox from the airplane.

 TASK 27-51-69-404-007
 3. Flap Angle Gearbox Installation (Fig. 401)
_______________________________
 A. Consumable Materials
　
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