56-21-01
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (6)  
B00027 Compound - Buffing, Learock No. 888

 (7)  
B00026 Compound - Buffing, Learock No. S-30

 (8)  
B00302 Polish - Plex-I-Glow

 (9)  
G02044 Abrasive - Micromesh cloth 1600, 8000 grit

 (10)
 G02167 Sandpaper - Scotchbrite, wet/dry paper C, 100 to 600 grit

 (11)
 B00710 Meguiars Mirror Glaze - MGH-17

 (12)
 B00712 Micro Gloss Mirror - Cleaner

 D. References
 (1)  
AMM 12-16-04/301, Passenger Windows

 (2)  
AMM 56-21-01/401, Passenger Windows

 (3)  
AMM 56-21-01/601, Passenger Windows

 E. Access
 (1)  Location Zones
 211 Passenger Cabin Nose to First Door, Left
 212 Passenger Cabin Nose to First Door, Right
 223 Fwd Upper Deck Passenger Cabin, Left
 224 Fwd Upper Deck Passenger Cabin, Right
 225 Aft Upper Deck Passenger Cabin, Left
 226 Aft Upper Deck Passenger Cabin, Right
 231 Passenger Cabin First to Second Door, Left
 232 Passenger Cabin First to Second Door, Right
 241 Passenger Cabin Second to Third Door, Left
 242 Passenger Cabin Second to Third Door, Right
 251 Passenger Cabin Third to Fourth Door, Left
 252 Passenger Cabin Third to Fourth Door, Right
 261 Passenger Cabin Fourth Door to Sta 2040, Left
 262 Passenger Cabin Fourth Door to Sta 2040, Right
 271 Passenger Cabin Sta 2040 to Sta 2360, Left
 272 Passenger Cabin Sta 2040 to Sta 2360, Right

 F. Prepare for the Outer Pane External Surface Repair.
 S 228-011
 (1)  Use the optical micrometer to find if the window thickness will permit a repair.
 NOTE: The minimum outer pane thickness after repair must not be
____ less than 0.280 inch for all outer windows in the fuselage.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 218-012
 (2)  
Make sure there is no damage to the seal.

 S 028-006

 (3)  
If the window is not clear or there is seal damage, replace the window (AMM 56-21-01/401).

 S 958-014

 (4)
Apply the tape to prevent damage to the window frame and the seal.

 S 178-015

 (5)  
Remove loose dirt with your bare hand and a spray of water.

 NOTE: You must use your bare hand to find large abrasives quickly
____ and remove them before they become embedded in the window surface.
 G. Outer Pane External Surface Repair
 S 128-007
 (1)  Remove small clamshell surface chips, scratches, or other surface crazing.
 NOTE: Use an abrasive paper or cloth applicable to the initial
____ condition of the window (usually not coarser than 100 grit for gouges, deep scratches and bad crazing). If the damage is not too bad, start with a fine abrasive to decrease the subsequent polish time. Use much water to keep the window surface cool and to flush away the grit and the acrylic material removed. You can use a vibrating sander (approximately 8000 cpm). First sand the all the window in the horizontal direction, and then sand all the window in the vertical direction. If you sand with course grit for one to two minutes, you will remove approximately 0.005 inch of acrylic from the window.
 (a)  
Use sufficient water to keep the window surface cool and to flush away the grit and the acrylic material you remove.

 (b)  
Change the abrasive paper frequently and flush with the water.

 (c)  
Continue the repair until you remove all the surface damage and the surface looks uniform.

 (d)  
After you remove the damage, continue for approximately one more minute to make sure you remove all the crazing and the cracks.

 S 128-021
 (2)  Polish the window with subsequently more abrasive materials.
 NOTE: Use 100 - 600 grit paper and micromesh cloths of 1600 - 8000.
____
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