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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 D. Remove the Overheat Switch
 S 022-031
 (1)  Disconnect the applicable electrical connector (3) from the overheat switch (1):
 -DS519 for pack 1
 -DS518 for pack 2
 -DS521 for pack 3
 S 022-032
 (2)  
Cut and remove the lockwire from the overheat switch (1).

 S 022-007

 (3)
Use two wrenches to remove the overheat switch (1) from the duct.

 NOTE: Use one wrench to hold the boss and the other wrench to
____
 turn the overheat switch.

 TASK 21-51-08-402-008
 3. Install the Pack Discharge Overheat Switch (Fig. 201)
__________________________________________
 A. Parts
 ~.............................................................................. | MM | | IPC | ................. ............................ | FIG | ITEM | NOMENCLATURE | SUBJECT | FIG | ITEM | ................................................................................ |201 | 1 | Overheat Switch - Pack 1 | 21-51-08 | 01 | 40 | | | 1 | Overheat Switch - Pack 2 | | 02 | 25 | | | 1 | Overheat Switch - Pack 3 | | 03 | 325 | | | 2 | Packing (O-ring) - Pack 1 | | 01 | 45 | | | 2 | Packing (O-ring) - Pack 2 | | 02 | 30 | | | 2 | Packing (O-ring) - Pack 3 | | 03 | 330 | 2......…........…...................................…..........….....….........1
 B. References
 (1)  
AMM 06-09-03/201, Body Section 44 Access Doors and Panels

 (2)  
AMM 20-11-28/401, Lockwire

 (3)  
AIPC 21-51-08-01

 (4)  
AIPC 21-51-08-02

 (5)  
AIPC 21-51-08-03

 (6)  
WDM 21-51-21, WDM 21-51-22, WDM 21-51-23

 (7)  
SSM 21-51-02

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

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

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

 D. Install the Overheat Switch
 S 422-033
 (1)  
Put a new O-ring (2) on the overheat switch.

 S 422-010

 (2)
Use two wrenches to install the overheat switch (1) in the duct.

 NOTE: Use one wrench to hold the boss and the other wrench to
____
 turn the overheat switch.

 S 422-034
 (3)  
Install a lockwire on the overheat switch (AMM 20-11-28/401).

 S 422-035

 (4)  
Connect the applicable electrical connector (3) to the overheat switch (1):

 -DS519 for pack 1
 -DS518 for pack 2
 -DS521 for pack 3
 E. Put the airplane to its usual condition
 S 412-013
 (1)  
Close the applicable access door, 191N-L or 192H-R
 (AMM 06-09-03/201).

 S 862-014

 (2)  
Remove the DO-NOT-CLOSE tag and close the applicable circuit breaker, on the P180 DC Power Distribution Panel:

 (a)  
180J2, PACK 1 PROT

 (b)  
180F2, PACK 2 PROT

 (c)  
180J17, PACK 3 PROT

 S 862-015
 (3)  Remove the DO-NOT-OPERATE tag from the applicable PACKS selector, on the P5 panel.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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