(2)  
36-00-00/201, Pneumatic System

 (3)  
AMM 45-10-00/201, Central Maintenance Computer System

 (4)  
AIPC 21-61-10 Fig. 10

 (5)  
AIPC 21-61-10, Fig. 10A

 (6)  
WDM 21-61-93

 (7)  
SSM 21-61-05

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

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

 C.  Prepare to Remove the Pressure Sensor
 S 864-002
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 864-003

 (2)  
Set the EICAS ECS maintenance page from the CMC CDU
 (AMM 45-10-00/201).

 (3)
Remove the pressure from the pneumatic system (Ref 36-00-00/201).

 S 214-021

 (4)  
Make sure that the EICAS ECS maintenance page shows that the TRIM AIR PRESS indication is approximately 0.

 S 864-006

 (5)  
Open this circuit breaker on the P180 DC Power Distribution panel and attach a DO-NOT-CLOSE tag:

 S 864-005
 (a)  180F17, TRIM AIR PRESS SENSOR
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A

747-400
MAINTENANCE MANUAL

TRIM AIR PRESSURE SENSOR BSEE 
SEE  A 
FWD 
EQUIPMENT BAY AIR CONDITIONING 
FITTING 
ELECTRICAL CONNECTOR  FITTING SENSOR  EXCHANGER (REF) PACK 2 HEAT 
BOLT/NUT (4 PLACES)  A 

B
Trim Air Pressure Sensor Installation Figure 401
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 014-007
 (6)  Open the access panel, 191N-L (Ref 06-09-03/201).
 D. Remove the Pressure Sensor
 S 214-008
 (1)  
Find the pressure sensor on the bulkhead which is adjacent to the heat exchanger for the pack 2.

 S 034-022

 (2)  
Disconnect the electrical connector, DT1616 from the pressure sensor.

 S 034-009
 WARNING: MAKE SURE THERE IS NO PRESSURE IN THE PNEUMATIC SYSTEM BEFORE
_______ YOU REMOVE THE TUBE FITTINGS FROM THE PRESSURE SENSOR. INJURY TO PERSONS CAN OCCUR IF YOU TRY TO REMOVE THE TUBE FITTINGS WHEN THERE IS PRESSURE IN THE PNEUMATIC SYSTEM.
 (3)  
Remove the tube fittings (2 locations) from the pressure sensor.

 S 034-010

 (4)  
Remove the nuts and the bolts (4 locations) from the pressure sensor.

 S 024-023

 (5)  
Remove the pressure sensor from the bracket.

 TASK 21-61-13-404-011
 3.  Trim Air Pressure Sensor Installation (Fig. 401)_____________________________________
 A. References
 (1)  
06-09-03/201, Body Panels and Access Doors

 (2)  
21-00-00/201, Air Conditioning

 (3)  
24-22-00/201, Manual Control

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

 (5)  
AIPC 21-61-10 Fig. 10

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 ALL  ú ú 03 Page 403 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (6)  
AIPC 21-61-10, Fig. 10A

 (7)  
WDM 21-61-93

 (8)  
SSM 21-61-05

 B. Access
　
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