(f)  
Lower Forward Cargo DS1904

 (g)  
Lower Aft Cargo DS1905

 S 032-007
 (6)  
Cut the lockwire on the duct overtemperature switch and discard it.

 S 022-008

 (7)  
Remove the duct overtemperature switch.

 TASK 21-61-07-402-009
 3.  Zone Duct Overtemperature Switch Installation (Fig. 201)_____________________________________________
 A.  References
 (1)  
AMM 20-11-28/401, Lockwire

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

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

 (4)  
AMM 45-10-00/201, Central Maintenance Computer System

 (5)  
IPC 21-61-07 Fig. 1 and 2, 21-61-64 Fig. 1

 (6)  
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
 (2)  Access Panel
 192BR Air Conditioning Access Panel

 C. Procedure
 S 422-010
 (1)  
Install the duct overtemperature switch in the duct.

 S 432-011

 (2)  
Install the lockwire to the duct overtemperature switch (AMM 20-11-28/401).

 S 432-012

 (3)  
Connect the electrical connector to the duct overtemperature switch:

 (a)  
Flight Deck DS1894

 (b)  
Upper Deck DS1895

 (c)  
Crew Rest Area DS2282

 (d)  
Forward Main Deck DS2279

 (e)  
Aft Main Deck DS2281

 (f)  
Lower Forward Cargo DS1904

 (g)  
Lower Aft Cargo DS1905

 D. Do a Check of the Overheat Switch
 S 862-013
 (1)  
Push the ZONE RST switch on the P5 overhead panel.

 S 862-014

 (2)  
Set the CMCS EXISTING FAULTS page for air conditioning (AMM 45-10-00/201).

 S 712-015

 (3)  
Make sure there are no messages for the duct overheat switches on the CMC EXISTING FAULTS page.

 TASK 21-61-07-702-023
 4. Zone Duct Overtemperature Switch Test (Fig._____________________________________201)
 A. General
 (1)  This task does a test of the electrical circuit for the zone duct overtemperature switch. This task does not make sure that the zone duct overtemperature switch is calibrated correctly. A calibration test of the overtemperature switch must be done off of the airplane.
 B. References
 (1)  
AMM 25-59-01/401, Main Deck Cargo Lining Panels

 (2)  
AMM 32-00-30/201, Landing Gear Door Locks

 (3)  
IPC 21-61-07 Fig. 1 and 2, 21-61-64 Fig. 1

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

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 01F Page 207 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 C. 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

 (2)  
Access Panel
 192BR Air Conditioning Access Panel

 D. Prepare for the Test
 S 862-036
 (1)  For the Flight Deck, Upper Deck, Crew Rest Area, Forward Main Deck or Aft Main Deck switches, remove the DO-NOT-CLOSE tags and close this circuit breaker:
　
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