21-51-03
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 017-011
 (4)  Remove the header access door.
 E. Procedure
 S 167-005
 (1)  Clean the heat exchanger.
 CAUTION: DO NOT HOLD THE AIR NOZZLE LESS THAN 6 INCHES FROM THE HEAT
_______ EXCHANGER CORE. YOU WILL BEND THE HEAT EXCHANGER FINS IF YOU TOUCH THEM. IF THE FINS ARE BENT, THE HEAT EXCHANGER WILL NOT OPERATE SATISFACTORILY.
 (a)  
Put the air nozzle through the ram-air exit door.

 (b)  
Move the air nozzle along all of the heat exchanger core to blow the contamination out of the heat exchanger.

 (c)  
Look through the header access door to make sure there is no contamination on the heat exchanger fins.

 (d)  
Do the previous three steps again, until more than 80% of the contamination is gone.

 CAUTION: DO NOT TOUCH THE HEAT EXCHANGER FINS WITH THE VACUUM
_______ NOZZLE. YOU WILL BEND THE FINS IF YOU TOUCH THEM. IF THE FINS ARE BENT, THE HEAT EXCHANGER WILL NOT OPERATE SATISFACTORILY.
 (e)  
Put the vacuum nozzle through the header access door.

 (f)  
Move the vacuum nozzle along all of the heat exchanger core to remove the contamination from the heat exchanger.

 F. Put the Airplane to Its Usual Condition
 S 417-013
 (1)  
Install the header access door.

 (2)  
Connect the ram-air exit door to its actuator.

 S 417-007

 (3)  
Close the applicable access panel 191E-L, 192E-R or 191M-L
 (AMM 06-09-03/201).

 S 417-012
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 AIR CYCLE MACHINE (ACM) - REMOVAL/INSTALLATION
______________________________________________
 1.  General_______
 A.  This procedure has instructions to remove the air cycle machines (ACMs) and to install the air cycle machines. An air cycle machine is in the center of each air cooling pack.
 TASK 21-51-04-004-001
 2.  Air Cycle Machine Removal (Fig. 401)_________________________
 A.  Special Tools and Equipment
 (1)  
ACM Lifting Tool ME65B40000-1

 (2)  
ACM Lifting Tool 2ME65B40005

 B.  References
 (1)  
AMM 06-09-03/201, Body Section 44 Access Doors and Panels

 (2)  
IPC 21-51-00, Fig. 5

 (3)  
IPC 21-51-00, Fig. 6

 (4)  
IPC 21-51-00, Fig. 7

 C.  Access
 (1)  
Location Zone
 133 Air Conditioning Equipment Bay, LH
 134 Air Conditioning Equipment Bay, RH

 (2)  
Access Panels
 191A-L Air Conditioning Access Door
 191H-L Air Conditioning Access Door
 192A-R Air Conditioning Access Door

 D.  Prepare for the Removal
 S 864-003
 (1)  Turn the applicable (1, 2, or 3) PACKS selector, on the overhead panel, P5, to the OFF position.
 (a)  Put a DO-NOT-OPERATE tag on the selector.
 S 014-005
 (2)  Open the applicable access door 191A-L, 191H-L or 192A-R (AMM 06-09-03/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 21-51-04
 ALL  ú ú 01 Page 401 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

COMPRESSOR 
INLET  14. BRACKET 
1. RETAINER  SEE  B 
2. SLEEVE 
3. SEAL  4.  COUPLING 
(QTY 2) 12. COUPLING  5.  O-RING (QTY 2) 
O-RING13. 
(QTY 2) 
TURBINE 
BYPASS 
ACM PACK 1  PACK 3  ACM PACK 2  INLET TURBINE  COMPRESSOR OUTLET 
　
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