C.
Consumable Materials

 (1)  
D00137 Engine Oil - PWA 521B

 D.
References

 (1)  
AMM 72-34-03/401, Fan Exit Liner Segments

 E.
Access

 (1)  
Location Zone
 412 Engine 1 - Engine
 422 Engine 2 - Engine
 432 Engine 3 - Engine
 442 Engine 4 - Engine

 (2)  
Access Panel 415 and 416 Thrust Reverser Halves - Engine 1 425 and 426 Thrust Reverser Halves - Engine 2 435 and 436 Thrust Reverser Halves - Engine 3 445 and 446 Thrust Reverser Halves - Engine 4

 F.
Do the 4th-Stage LPC Blade and Vane Inspection.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
No. 14 - LPC 4th-Stage Blade and Vane Inspection
________________________________________________
 S 486-318-N00
 WARNING: DO NOT DO A BORESCOPE INSPECTION IF THE WIND IS MORE THAN
_______ 3 - 5 MPH (4.8 - 8 KPH). DURING WINDY CONDITIONS, THE N1 ROTOR CAN TURN (WINDMILL). THIS CAN CAUSE INJURY TO INSPECTION PERSONNEL AND DAMAGE TO BORESCOPE EQUIPMENT.
 (1)  Do this procedure: If there are mild wind conditions, less than 3 - 5 miles per hour (4.8 - 8 kph), install PWA 102757 Wedges as
 follows:
 WARNING:_______ INSTALL PWA PWA 102757 WEDGES BETWEEN THE FAN BLADES
 DURING MILD WIND, LESS THAN 3 - 5 MPH (4.8 - 8 KPH).  IF

 YOU DO NOT INSTALL THE WEDGES DURING MILD WIND CONDITIONS, THE N1 ROTOR CAN TURN (WINDMILL). THIS CAN CAUSE INJURY TO INSPECTION PERSONNEL AND DAMAGE TO BORESCOPE EQUIPMENT.
 (a)  
Install two or three PWA 102757 Wedges between several fan blades and the fan case at approximately the 6 o'clock location.

 (b)  
Make sure the wedge is installed tight enough to prevent the fan blades from turning but they must not raise the fan blades up.

 (c)  
The red warning streamer must go towards the front of the engine inlet.

 (d)  
If it is necessary to turn the N1 rotor to complete the borescope inspection, you will have to remove the wedges, turn the fan rotor by and install the wedges again. Do this procedure again until the borescope inspection is complete.

 S 846-140-N00
 (2)  
Do this procedure: Prepare for the Borescope Inspection.

 S 016-141-N00

 (3)  
Examine the 4th-stage vanes and blades through one of the fourteen AP-1 access port locations (the flow path of the 2.5 bleed air) (Fig. 609) (AMM 72-34-03/401).

 NOTE: The flow path of the 2.5 bleed air is through one of the
____ fourteen openings in the fan exit liner segments (inner rear) and an open 2.5 bleed air valve. The top eight openings have screens which must be removed before you put the borescope in the flow path. The remaining six openings across the bottom of the engine do not have screens and the borescope access is direct.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
No. 14 - LPC 4th-Stage Blade and Vane Inspection
________________________________________________
 S 016-182-N00
 (4)  
If you will use one of the top eight AP-1 access ports, remove the screens:

 (a)  
Remove the screws from the applicable inner, front, lining segments of the fan exit.

 NOTE: The removal of these inner, front lining segments of the
____ fan exit gives access to the bolts of the bleed screens.
 (b)  
Remove the lining segments.

 (c)  
Remove the bolts and the washers from the bleed valve ducts and screens.

 (d)  
Remove the ducts and the screens.

 S 296-142-N00
 WARNING: DO NOT USE THE POWER CABLE OF THE BORESCOPE IF YOU FIND
_______ CIRCUMFERENTIAL CUT HOLES, FRAYING, OR BROKEN HOLES IN THE EXTERNAL RUBBER COVERING ON THE CABLE. POWER CABLES WITH THOSE CONDITIONS CAN CAUSE INJURY TO PERSONS.
　
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