F.
Put the Airplane Back to Its Usual Condition.

 S 414-029-N00
 WARNING: OBEY THE INSTRUCTIONS IN 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.
 (1)  
Close the left thrust reverser (Ref 78-31-00/201).

 S 414-026-N00

 (2)  
Close the left core cowl panel (Ref 71-11-06/201).

 S 414-027-N00

 (3)  
Close the left fan cowl panel (Ref 71-11-04/201).

 S 444-028-N00

 (4)  
Do the activation procedure for the thrust reverser
 (Ref 78-31-00/201).

 S 614-010-N00

 (5)  
If it is necessary, do the servicing procedure for the oil tank (Ref 12-13-03/301).

 S 794-011-N00

 (6)
Do the Test No. 3 - Ground Test - Idle Power (Ref 71-00-00/501).

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 79-21-07
 ALL  ú ú N01 Page 406 ú Jun 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
ENGINE AIR/OIL HEAT EXCHANGER AND VALVE - REMOVAL/INSTALLATION
______________________________________________________________
 1.  General
_______
 A.  This procedure removes and installs the air/oil heat exchanger and valve
 as an assembly. After the assembly is removed from the engine, you can
 remove the valve from the air/oil heat exchanger if it is necessary.

 B.  The air/oil heat exchanger and valve is installed on the intermediate
 case at the 8 o'clock position.

 C.  You can get access to the air/oil heat exchanger and valve through the
 left thrust reverser half.

 TASK 79-21-09-004-001-N00
 2.  Remove the Engine Air/Oil Heat Exchanger and Valve (Fig. 401)
__________________________________________________
 A.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 71-11-04/201, Fan Cowl Panels

 (3)  
AMM 71-11-06/201, Core Cowl Panels

 (4)  
AMM 72-34-03/401, Fan Exit Liner Segment

 (5)  
AMM 78-31-00/201, Thrust Reverser System

 (6)  
AIPC 79-21-09, Fig. 1

 (7)  
AIPC 79-21-09, Fig. 5

 (8)  
AIPC 79-21-01, Fig. 15

 B.  
Access

 (1)  
Location Zone
 412 Engine 1 - Intermediate Case 8 o'clock
 422 Engine 2 - Intermediate Case 8 o'clock
 432 Engine 3 - Intermediate Case 8 o'clock
 442 Engine 4 - Intermediate Case 8 o'clock

 (2)  
Access Panels
 415 Left Thrust Reverser Half - Engine 1
 425 Left Thrust Reverser Half - Engine 2
 435 Left Thrust Reverser Half - Engine 3
 445 Left Thrust Reverser Half - Engine 4

 C.  
Procedure

 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 864-003-N00

 (2)  
Make sure the applicable FUEL CONTROL switch is in the CUTOFF position.

 S 864-002-N00
 (a)  Install the DO-NOT-OPERATE tag on the FUEL CONTROL switch.
 S 864-004-N00
 (3)  Push the STAT button on the display select panel of the EICAS and make sure the status page shows on the auxiliary EICAS.
 (a)  Make sure the applicable EICAS status message, FUEL SPAR VLV 1, 2, 3, or 4, does not show.
___
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 79-21-09
 ALL  ú ú N01 Page 401 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
FSEE VALVE DUCT  COOLER (REF) FUEL/OIL 
SEE  A  B 

FAN EXIT LINER SEGMENT (REF)
3.  
WASHER

4.  
INNER BOLT

(4 LOCATIONS)
4

FWD  VALVE DUCT
SEE F

3.  WASHER
2.  OUTER BOLT (4 LOCATIONS)
1.  ENGINE AIR/OIL
　
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