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 ALL  ú ú N01 Page 401 ú Feb 18/00
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
A
A
LPC HUB
SEEA C
1. BLADE LOCK
A-A
SEE B
1. BLADE LOCK
L-A2003
LOCK A JOINT
PIN PUNCH
B
1st-Stage (Fan) Blade Installation Figure 401 (Sheet 1)
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D

SEE
RING CUTOUT
MOMENT WEIGHT MARKING AREA (CONCAVE SIDE)

1st-Stage (Fan) Blade Installation Figure 401 (Sheet 2)
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
F. Procedure
 S 494-073-N00
 CAUTION: MAKE SURE THAT YOU PUT COVERS ON ALL OF THE LOWER HALF OF THE
_______
 INLET COWL SURFACE. ALSO MAKE SURE THAT THE EDGES OF THE MATS
 TOUCH OR ARE ATTACHED WITH SOME TAPE. IF THE EDGES ARE NOT,
 THEN THE TOOLS OR PARTS CAN FALL AND CAUSE DAMAGE TO THE INLET
 COWL SURFACE.

 (1)  
Put the protective mats on the inner lower half of the inlet cowl.

 S 414-074-N00

 (2)  
Remove the inlet cone (AMM 72-31-01/401).

 S 034-075-N00
 WARNING:_______ALWAYS WEAR GLOVES WHEN YOU TOUCH THE FAN BLADES. THE FAN
 BLADES ARE SHARP AND CAN CAUSE INJURY TO YOUR HANDS.

 CAUTION: MAKE SURE YOU INSTALL THE BLADE LOCK IF YOU MUST GO AWAY FROM
_______ THE ENGINE. IF THERE IS ENGINE WINDMILLING WHEN THE FAN BLADES ARE IN THE FORWARD POSITION, THE BLADES CAN BECOME DAMAGED.
 (3)  
Use a small pin punch, in the hole that is near the lock joint, to
 remove the fan blade lock (1) (Fig. 401, sheet 1).

 S 984-076-N00

 (4)  
Turn the fan blades until the blade you will remove is at the 12
 o'clock position.

 S 494-077-N00

 (5)  
Install the (PWA 85035) support fixture to the front LPC hub.

 (a)  
Attach the (PWA 85035) support fixture to the front LPC hub with the bolts (Fig. 401, sheet 2).

 S 014-078-N00
 (6)  
Align the cutout with the blade you will remove (Fig. 401, sheet 2).

 G.
Remove One or Two Fan Blades

 S 024-079-N00
 CAUTION:_______BE CAREFUL WITH THE FAN BLADE WHEN YOU REMOVE IT. YOU CAN EASILY CAUSE DAMAGE TO THE SEAL THAT IS BONDED TO THE BOTTOM OF THE FAN BLADE PLATFORM.
 (1)  
Do the steps that follow to keep the blade shroud and root free to
 move during the blade removal:

 (a)  
Before you move each fan blade, put it at the 12 o'clock position.

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(b)  
Carefully pull the fan blade forward a small increment, in the hub slot.

 (c)  
Go counterclockwise, as seen from the front, to the adjacent fan blade.

 (d)  
Continue to move all of the blades forward, one at a time, until each blade is stopped by the fixture.
　
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