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A
747-400
MAINTENANCE MANUAL

 C. Procedure
 S 432-011
 (1)  
Put the filter in the filter cover.

 S 422-012

 (2)  
Install the filter cover with the filter in the air inlet of the temperature sensor assembly.

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747-400 MAINTENANCE MANUAL
 ZONE DUCT OVERTEMPERATURE SWITCH - MAINTENANCE PRACTICES
________________________________________________________
 1.  General_______
 A.  This procedure has these tasks:
 (1)  
The removal of the Zone Duct Overtemperature Switch

 (2)  
The installation of the Zone Duct Overtemperature Switch

 (3)  
Zone Duct Overtemperature Switch Test

 B.  There are seven zone duct overheat switches installed in the following locations:
 (1)  
FLIGHT DECK

 (a)  In the area aft of the crew rest area approximately four feet forward of the flight deck fan.

 (2)  
UPPER DECK

 (a)  In the area aft of the crew rest area just aft and inboard of the flight deck switch.

 (3)  
CREW REST AREA

 (a)  Near the airplane centerline above the ceiling panel approximately six feet aft of the flight deck fan.

 (4)  
FORWARD MAIN DECK

 (a)  
Near the airplane centerline above the ceiling panel at STA

 910.

 (5)  
AFT MAIN DECK

 (a)  Near the airplane centerline above the ceiling panel at STA 1292.

 (6)  
LOWER FORWARD CARGO

 (a)  In the right air conditioning bay on the forward cargo air conditioning duct.

 (7)  
LOWER AFT CARGO

 (a)  In the right wheel well of the body landing gear on the aft cargo air conditioning duct.
 TASK 21-61-07-002-001
 2.  Zone Duct Overtemperature Switch Removal (Fig.________________________________________201)
 A.  References
 (1)  
AMM 09-11-00/201, Towing

 (2)  
AMM 25-59-01/401, Main Deck Cargo Lining Panels

 (3)  
AMM 32-00-30/201, Landing Gear Door Locks

 (4)  
IPC 21-28-51 Fig. 2, 21-61-07 Fig. 1 and 2, 21-61-64 Fig. 1

 B.  Access
 (1)  Location Zone
 134 Air Conditioning Equipment Bay, RH
 138 Body Landing Gear Well, RH
 233 Area Aft of Crew Rest, LH
 243 Area Above Ceiling, LH
 244 Area Above Ceiling, RH

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747-400
MAINTENANCE MANUAL

CREW REST AREA ZONE DUCT OVERTEMPERATURE SWITCH
SEE  A  FORWARD MAIN DECK ZONE 
DUCT OVERTEMPERATURE SWITCH 
UPPER DECK ZONE DUCT  SEE  A 

OVERTEMPERATURE SWITCH SEE A
AFT MAIN DECK ZONE 
DUCT OVERTEMPERATURE SWITCH 
SEE  A 
FLIGHT DECK ZONE DUCT 
OVERTEMPERATURE SWITCH 
SEE  A 

LOCKWIRE ZONE DUCTELECTRICAL TEMPERATURECONNECTOR SENSOR
ZONE DUCT OVERTEMPERATURE SWITCH (EXAMPLE)
DUCT OVERTEMPERATURE SWITCH
(EXAMPLE)

A

Zone Duct Overtemperature Switch Installation
Figure 201 (Sheet 1)

M26681
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