(e)  
Disengage the drive shafts (14).

 (f)  
Remove bolts (4), washers (5) and nuts (6) that attach the gearbox to the structure.

 (g)  
Remove the gearbox (1).

 TASK 27-81-16-404-011
 3.  Offset Gearbox Installation___________________________
 A. Special Tools and Equipment
 (1)  
17MIT65B04017 Leading Edge Flap Drive Unit Lock

 B.
Consumable Materials

 (1)  
D00013 Grease - MIL-G-23827

 (2)  
C00590 Primer - BMS 10-11, type I

 (3)  
C00308 Corrosion Preventive Compound MIL-C-11796, class 3

 C. Parts ~.............................................................................. | AMM | | AIPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ | 401 | 1 | Offset Gearbox | 27-81-51 | 01 | 180 | | | 2 | Bolt | 27-81-16 | 01 | 40 | | | 3 | Washer | | | 45 | | | 4 | Bolt (Upper) | 27-81-51 | 01 | 145 | | | 4 | Bolt (Lower - LH) | | | 150 | | | 4 | Bolt (Lower - RH) | | | 155 | | | 5 | Washer (Upper) | | | 160 | | | 5 | Washer (Lower) | | | 165 | | | 6 | Nut (Upper) | | | 170 | | | 6 | Nut (Lower) | | | 175 | | | 7 | Gear | 27-81-16 | 01 | 55 | | | 9 | Drain | | | 20 | | | 10 | Bolt (Middle 2) | | | 25 | | | 10 | Bolt (Bottom 2) | | | 5 | | | 11 | Washer (Middle 2) | | | 30 | | | 11 | Washer (Bottom 2 - On Drain) | | | 10 | | | 12 | Nut | | | 15 | | | 13 | Screw | 27-81-51 | 01 | 15 | | | 15 | Screw | 27-81-16 | 01 | 60 | 2......…........…...................................…...........….....…........1
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747-400
MAINTENANCE MANUAL

 D. References
 (1)  
24-22-00/201, Manual Control

 (2)  
27-81-00/201, Leading Edge Flap System

 (3)  
27-81-16/601, Offset Gearbox

 (4)  
29-11-00/201, Main Hydraulic Supply System

 (5)  
36-00-00/201, Pneumatic System

 (6)  
SSM 27-81-04, 27-81-05, 27-81-06

 (7)  
WDM 27-81-31, 27-81-32, 27-81-81, 27-81-82

 E.
Access

 (1)  
Location Zone
 513 Krueger Flap Midflap, LH
 613 Krueger Flap Midflap, RH

 F.
Install the Offset Gearbox

 S 224-012
 (1)  
Do this task if you install used drive shaft and coupling: "Offset Gearbox Inspection/Check" (Ref 27-81-16/601).

 S 424-013

 (2)  
Install the offset gearbox (Fig. 401):

 (a)  
Remove bolts (2 and 10), washers (3 and 11) and nuts (12) to remove the drain (9).

 (b)  
Lubricate the gears (8) with grease. 1) Fill the gear teeth with grease but not the housing.

 (c)  
Install the drain with bolts (2 and 10), washers (3 and 11) and nuts (12).

 (d)  
Align the holes in the gearbox and the structure.

 (e)  
Apply a layer of the corrosion preventive compound or wet primer to the mounting bolts (4).

 (f)  
Install three mounting bolts (4), washers (5) and nuts (6).

 (g)  
If the LE flap system stays in the initial position: 1) Connect the drive shafts. 2) Install the lockwire.

 (h)  
If the LE flap system is not in the initial position, adjust the LE flap position: 1) Manually extend the LE flaps until the rotary actuators

 touch the actuator links.
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747-400 MAINTENANCE MANUAL
 2)  Apply a light layer of grease to the drive shaft and
 gearbox splines. 3) Connect the drive shafts (14, 16) to the gearbox (1). 4) Install the lockwire on the screws. 5) Turn the gearbox input shaft (16) three times in the
　
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