(a)
Connect the sense hose to the pressure transmitter.
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S 865-010
(6)
Pressurize the pneumatic system (AMM 36-00-00/201).
S 785-011
(7)
Look at the EICAS MAINT PAGE for 21 ECS.
(a)
Make sure the left and the right DUCT PRESSURE indications are approximately equal.
F. Put the Airplane to Its Usual Condition
S 865-012
(1)
Release the pressure in the pneumatic system (AMM 36-00-00/201).
S 415-013
(2)
Close the access door (AMM 06-09-03/201).
(3)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
S 865-014
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747-400 MAINTENANCE MANUAL
DUCT PRESSURE TRANSMITTER - REMOVAL/INSTALLATION
________________________________________________
1. General_______
A. This procedure contains two tasks. The first task removes the duct pressure transmitter. The second task installs the duct pressure transmitter.
B. The duct pressure transmitter is installed in the air conditioning bay. It is necessary to open one of the access doors for the air conditioning bay to get access to the transmitter.
C. When a duct pressure transmitter is removed, it is necessary to replace the O-ring that is installed on the transmitter connection.
TASK 36-21-01-004-001
2. Remove the Duct Pressure Transmitter (Fig. 401)____________________________________
A. References
(1)
AMM 06-09-03/201, Body Section 44 Access Doors and Panels
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 36-00-00/201, Pneumatic System
(4)
IPC 36-21-00, Fig. 1
B.
Access
(1)
Location Zone 191 Left Pressure Transmitter - Fairing, Wing-To-Body, Forward Lower Half, Left
192 Right Pressure Transmitter - Fairing, Wing-To-Body, Forward Lower Half, Right
(2)
Access Panel 191-NL Door - Access, Air Conditioning - Left Pressure Transmitter
192-NR Door - Access, Air Conditioning - Right Pressure Transmitter
C. Prepare to Remove the Transmitter
S 864-002
(1)
Supply electrical power (AMM 24-22-00/201).
S 864-003
(2)
Put the two wing ISLN switches, on the P5 Overhead Panel,to the OPEN position.
(3)
Release the pressure in the pneumatic system (AMM 36-00-00/201).
S 864-004
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MAINTENANCE MANUAL
SEE A
SEE B
DUCT PRESSURE TRANSMITTER A SCREW WASHER (4 LOCATIONS)
ELECTRICAL CONNECTOR 0-RING (NOT SHOWN)
NOTE:____ THE RIGHT DUCT PRESSURE TRANSMITTER IS SHOWN. THE LEFT DUCT PRESSURE TRANSMITTER IS OPPOSITE. PRESSURE SENSE HOSE
Figure 401 B Duct Pressure Transmitter Installation FWD
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