747-400
MAINTENANCE MANUAL

FORWARD CARGO CONDITIONED AIR SUPPLY
SEE B
PACK 3 WATER SEPARATOR PACK 3 WATERSEE C SEPARATOR
FORWARD CARGO CONDITIONED AIR SUPPLY (IN RIGHT AIR CONDITIONING EQUIPMENT BAY)
B
LOCKWIRE
FORWARD CARGO DUCT OVERTEMPERATURE SWITCH
FORWARD CARGO DUCT
TEMPERATURE SENSOR ELECTRICAL CONNECTOR
C
Zone Duct Overtemperature Switch Installation Figure 201 (Sheet 2)
M26691
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747-400
MAINTENANCE MANUAL

AFT CARGO ZONE DUCT OVERTEMPERATURE SWITCH
SEE D
AFT CARGO ZONE DUCT TEMPERATURE SENSOR
LOCKWIRE
ELECTRICAL
CONNECTOR

AFT CARGO ZONE DUCT OVERTEMPERATURE SWITCH
AFT CARGO ZONE DUCT OVERTEMPERATURE SWITCH D
Zone Duct Overtemperature Switch Installation Figure 201 (Sheet 3)
M26694
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747-400 MAINTENANCE MANUAL
 (2)  Access Panel
 192BR Air Conditioning Access Panel

 C.  Prepare for the Removal
 S 862-002
 (1)  If you remove the Flight Deck, Upper Deck, Crew Rest Area, Forward Main Deck or Aft Main Deck Switch, open this circuit breaker on the P6 main power distribution panel and attach a DO-NOT-CLOSE tag:
 (a)  6F30, MASTER TRIM AIR CONT
 S 862-003
 (2)  If you remove the lower Forward Cargo Switch, open this circuit breaker on the P6 main power distribution panel and attach a DO-NOT-CLOSE tag:
 (a)  6F36, A/C CONT CARGO - FWD LWR
 S 862-004
 (3)  If you remove the lower Aft Cargo Switch, open this circuit breaker on the P6 main power distribution panel and attach a DO-NOT-CLOSE tag:
 (a)  6F35, A/C CONT CARGO - AFT LWR
 S 012-005
 (4)  Get access to the applicable duct overtemperature switches:
 (a)  
FLIGHT DECK AND UPPER DECK

 1)  Get access to the area behind the crew rest area through the access door at the aft right side of the crew rest area.

 (b)  
CREW REST AREA

 1)  Remove the main deck ceiling panel that is on the airplane centerline at STA 820 (AMM 25-59-01/401).

 (c)  
FORWARD MAIN DECK

 1)  Remove the ceiling panel that is on the airplane centerline at STA 910 (AMM 25-59-01/401).

 (d)  
AFT MAIN DECK

 1)  Remove the ceiling panel that is on the airplane centerline at STA 1292 (AMM 25-59-01/401).

 (e)  
FORWARD CARGO COMPARTMENT 1) Open the access panel, 192BR (AMM 06-09-03/201).

 (f)  
AFT CARGO COMPARTMENT

 1)  Install the ground locks for the landing gear (AMM 09-11-00/201).
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747-400
MAINTENANCE MANUAL

 WARNING: REFER TO 32-00-30/201 FOR THE CORRECT INSTALLATION
_______ OF THE LOCKS FOR THE LANDING GEAR DOORS. THE DOORS CAN MOVE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO THE EQUIPMENT IF YOU DO NOT INSTALL THE LOCKS CORRECTLY.
 2)  Install the door locks for the body landing gear and the wing landing gear (AMM 32-00-30/201).
 S 032-006
 (5)  Disconnect the electrical connector from the applicable duct overtemperature switch:
 (a)  
Flight Deck DS1894

 (b)  
Upper deck DS1895

 (c)  
Crew Rest Area DS2282

 (d)  
Forward Main Deck DS2279

 (e)  
　
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