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747-400 MAINTENANCE MANUAL
 2) 414A2 LE FLAP ELEC DRIVE 4
 (d)  P415 Power Distribution Center - Right 1) 415M35 LE FLAP ELEC DRIVE 2 2) 415B32 LE FLAP ELEC DRIVE 3
 S 862-200
 (4)  
Do this task: "Pneumatic Power Removal" (AMM 36-00-00/201).

 S 862-201

 (5)  
Do this task to depressurize hydraulic systems No. 1 and 4: "Hydraulic System Depressurization" (AMM 29-11-00/201).

 E.
Remove the LEFDU Observation Window Assembly (Fig. 205):

 S 022-194
 (1)  Remove observation window, packing, and reflector plate from gear housing. keep screws and special washers for installation (Fig. 205).
 TASK 27-81-03-962-195
 15. LEFDU Observation Window Assembly Instalation
_____________________________________________
 A. Parts ~.............................................................................. | AMM | | AIPC | ................. ...........................| | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ...............................................................................|
 | 205  |  1  |  Housing Assembly  |  27-81-03 | 03  |  662 |
 |  |  2  |  Observation Window  |  |  |  591 |
 |  |  3  |  Packing  |  |  |  592 |
 |  |  4  |  Reflector Plate  |  |  |  593 |
 |  |  5  |  Screw  |  |  |  588 |
 |  |  6  |  Special Washer  |  |  |  589 |
 |  |  7  |  Special Washer  |  |  |  590 |

 2......…........…...................................…...........….....…........1

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A
747-400
MAINTENANCE MANUAL

LEFDU Observation Window Assembly Installation
Figure 205

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K29290
A
747-400
MAINTENANCE MANUAL

 B. Consumable Materials
 (1)  
A00713, Adhesive - MMMM-A-1617, Type 3 - Allied Signal(CMM 27-81-11)

 C.
Access

 (1)  
Location Zone
 512 Krueger Flap Inboard, LH
 523 Variable Camber Flap, LH
 525 Variable Camber Flap, LH
 535 Variable Camber Flap, LH
 612 Krueger Flap Inboard, RH
 623 Variable Camber Flap, RH
 625 Variable Camber Flap, RH
 635 Variable Camber Flap, RH

 D.
Install the LEFDU Observation Window Assembly (Fig. 205):

 S 422-196
 (1)  
Install the LEFDU Observation Window Assembly with the steps that follow (Fig. 205):

 (a)  
Apply a layer of adhesive on the tangs of reflector plate (4) that engages housing assembly (1).

 (b)  
Let air dry adhesive that you applied to the reflector plate (4) for at least 24 hours.

 (c)  
Install reflector plate (4), packing (3) and window (2) in housing assembly (1).

 (d)  
Remove excess of applied adhesive.

 (e)  
Apply a small drop of lubricant (Liqui-Moly) on the starting threads of screw (5).

 (f)  
Install one special washer (7) against window, then install one special washer (6) and one screw (5), at three locations in housing assembly.

 (g)  
Tighten the screws evenly.

 S 092-202
 WARNING:  YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
_______ LE FLAP SAFETY LOCKS. THE LE FLAPS CAN MOVE QUICKLY IF YOU DO NOT DO THE STEPS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
　
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