E. Do the Installation Test for the Housing
 S 864-031
 (1)  
Remove the DO-NOT-OPERATE tag from the applicable PACKS selector, on the P5 panel.

 S 864-027

 (2)  
Operate the applicable air cooling pack (Ref 21-00-00/201).

 S 794-028

 (3)  
Feel for leaks around the housing.

 (a)  
Small leaks are permitted.

 (b)  
You must repair a large leak.

 F. Put the airplane to its usual condition
 S 414-029
 (1)  
Close the applicable access door, 191A-L, 192A-R, 191H-L
 (Ref 06-09-03/201).

 (2)
Do the procedure to stop the air cooling pack (Ref 21-00-00/201).

 S 864-030
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 PACK DISCHARGE OVERHEAT SWITCH - MAINTENANCE PRACTICES
______________________________________________________
 1.  General_______
 A.  One pack discharge overheat switch is installed on each pack outlet duct. This procedure has instructions to do the following tasks:
 (1)  
Remove the Pack Discharge Overheat Switch

 (2)  
Install the Pack Discharge Overheat Switch

 (3)  
Do the Pack Discharge Overheat Switch Test.

 TASK 21-51-08-002-001
 2.  Remove the Pack Discharge Overheat Switch (Fig. 201)_________________________________________
 A.  References
 (1)  
AMM 06-09-03/201, Body Section 44 Access Doors and Panels

 (2)  
AIPC 21-51-08-01

 (3)  
AIPC 21-51-08-02

 (4)  
AIPC 21-51-08-03

 (5)  
WDM 21-51-21, WDM 21-51-22, WDM 21-51-23

 (6)  
SSM 21-51-02

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

 (2)  
Access Panel
 192H-R Air Conditioning Access Door
 191N-L Air Conditioning Access Door

 C.  Prepare for the Removal
 S 862-002
 (1)  Make sure the applicable (1, 2, or 3) PACKS selector, on the overhead panel, P5, is in the OFF position.
 (a)  Put a DO-NOT-OPERATE tag on the selector.
 S 862-003
 (2)  Open the applicable circuit breaker, on the P180 DC Power Distribution Panel, and attach a DO-NOT-CLOSE tag:
 (a)  
180J2, PACK 1 PROT

 (b)  
180F2, PACK 2 PROT

 (c)  
180J17, PACK 3 PROT

 S 012-004
 (3)  Open the applicable access door (AMM 06-09-03/201):
 -191N-L for packs 1 or 2
 -192H-R for pack 3
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 01 Page 201 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL 
SEPARATOR PACK 2 WATER  SEE  A  1  2  2. 1.  OVERHEAT SWITCH O-RING 

PACK 1 WATER
SEPARATOR
PACK DISCHARGE TEMPERATURE
SEE B
SENSOR B
PACK 3 WATERFWD PACK DISCHARGESEPARATOR FWD TEMPERATURE SENSOR A
AIR CONDITIONING
EQUIPMENT BAY

AIR CONDITIONING PACKS NO. 1 AND 2 1 AIR CONDITIONING PACK NO. 1 2
PACK DISCHARGE
A
OVERHEAT SWITCH
PACK DISCHARGE TEMPERATURE SENSOR A
PACK DISCHARGE TEMPERATURE
PACK DISCHARGE SENSOR A
TEMPERATURE SENSOR B
PACK DISCHARGE TEMPERATURE SENSOR B
FWD
PACK 2 GROUND SERVICE CONNECTION FWD
AIR CONDITIONING PACK NO. 2 2  1. OVERHEAT SWITCH
2. O-RING
A
AIR CONDITIONING PACK NO. 3
1 AIRPLANES WITH TWO GROUND SERVICE CONNECTIONS
B
2 AIRPLANES WITH THREE GROUND SERVICE CONNECTIONS
Pack Discharge Overheat Switch Installation
Figure 201

L56518
　
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