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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE A
____NOTE: LINER SEGMENT NO. 4 
OF THE FAN EXIT IS 
SHOWN REMOVED.
ANGLE GEARBOX 
A 
Angle Gearbox Inspection 
Figure 601 

LINER SEGMENT NO. 3 OF THE FAN EXIT
FWD
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(2)  S 016-011-N00Open the fan cowl panels (AMM 71-11-04/201).
 (3)  S 016-012-N00Open the core cowl panels (AMM 71-11-06/201).
 S 016-013-N00

 WARNING: OBEY THE INSTRUCTIONS IN AMM 78-31-00 WHEN YOU OPEN THE THRUST
_______ REVERSER. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (4)  
Open the thrust reversers (AMM 78-31-00/201).

 S 016-003-N00

 (5)  
Remove lining segment No. 4 of the fan exit (AMM 72-34-03/401).

 S 216-004-N00

 (6)  
Examine the angle gearbox for signs of oil leakage.

 (a)  
If you find oil leakage around the angle gearbox, replace the angle gearbox (AMM 72-62-01/401).

 S 216-005-N00
 (7)  
Examine the angle gearbox for cracks.

 (a)  
If you find cracks, replace the angle gearbox (AMM 72-62-01/401).

 S 226-006-N00
 (8)  
Examine the angle gearbox for signs of corrosion.

 (a)  
Areas with corrosion of less than 0.050 inch (1.270 mm) in depth are permitted.

 (b)  
The angle gearbox is serviceable if all of the conditions that follow occur. 1) The depth of the corrosion is equal to 0.050 inch (1.270

 mm). 2) The area of the corrosion is less than 1.00 square inch (645 square mm). 3) The corrosion is more than 2.00 inches (50.80 mm) away from other corrosion.

 (c)  
If the corrosion is more than the limits given, replace the angle gearbox (AMM 72-62-01/401).

 (9)  
Install the lining segment No. 4 of the fan exit (AMM 72-34-03/401).

 S 416-007-N00
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 416-014-N00

 WARNING:_______ OBEY THE INSTRUCTIONS IN AMM 78-31-00 WHEN YOU CLOSE THE THRUST
 REVERSERS.  IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO
 PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.

 (10)
 Close the thrust reversers (AMM 78-31-00/201).

 S 416-015-N00

 (11)
 Close the core cowl panels (AMM 71-11-06/201).

 S 416-017-N00

 (12)
 Close the fan cowl panels (AMM 71-11-04/201).

 S 446-016-N00

 (13)
 Do the activation procedure for the thrust reverser (AMM 78-31-00/201).

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