(2)
The installation of the PRSOV. This task contains a test of the PRSOV installation.
B.
The PRSOV is installed in the strut. It is necessary to open the aft mid lower strut access door on the strut left side to get access to the PRSOV. It is also necessary to open the pressure relief door opposite of the strut access door for access.
C.
If you must replace the PRSOV with a new PRSOV, it is necessary to remove the two elbows from the used PRSOV. The elbows are installed in the new PRSOV. It is also necessary to replace the O-ring that is installed on each elbow.
TASK 36-11-04-004-034
2. The PRSOV Removal (Fig. 401)
_________________
A. References
(1)
AMM 06-09-09/201, Nacelle and Engine-to-Wing Fairing Access Doors and Panels
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 36-00-00/201, Pneumatic System
B.
Access
(1)
Location Zone
452 Engine 1 - Strut Torque Box
462 Engine 2 - Strut Torque Box
472 Engine 3 - Strut Torque Box
482 Engine 4 - Strut Torque Box
(2)
Access Panel 452FL Access Door, Mid Lower Strut Aft - Engine 1 452ER Access Door, Forward Lower Midspar Pressure Relief -
Engine 1 462FL Access Door, Mid Lower Strut Aft - Engine 2 462ER Access Door, Mid Lower Strut Aft - Engine 2 472FL Access Door, Mid Lower Strut Aft - Engine 3 472ER Access Door, Mid Lower Strut Aft - Engine 3 482FL Access Door, Mid Lower Strut Aft - Engine 4 482ER Access Door, Forward Lower Midspar Pressure Relief -
Engine 4
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A
747-400
MAINTENANCE MANUAL
2. BONDING
JUMPER OPPOSITE
SEE A 1. PRSOV SIDE
SEE C
SEE B
PRESSURE SENSE PORT PRECOOLER 4. COUPLING 5. SEAL SEE D 3. ELECTRICAL CONNECTOR A FWD
A
A
B
B
7. DOWNSTREAM PRESSURE SENSE TUBE FWD B DOWNSTREAM PRESSURE SENSE PORT SENSE TUBE 6. PRECOOLER PRESSURE
Engine Bleed Air PRSOV Installation Figure 401 (Sheet 1)
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A
747-400 MAINTENANCE MANUAL
14. NUT
4. COUPLING
PRSOVGROUND STRAP
8. ELBOW 11. ELBOW
A-A B-B
Engine Bleed Air PRSOV Installation
Figure 401 (Sheet 2)
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747-400 MAINTENANCE MANUAL
C. Procedure
S 864-002
(1) Supply electrical power (AMM 24-22-00/201).
S 864-003
WARNING: YOU MUST RELEASE THE PRESSURE IN THE PNEUMATIC DUCT BEFORE YOU
_______ REMOVE A PNEUMATIC SYSTEM COMPONENT. THE HOT, HIGH PRESSURE AIR CAN CAUSE INJURY.
(2)
Release the pressure in the pneumatic system (AMM 36-00-00/201).
S 864-004
(3)
For the applicable engine, Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P6 Main Power Distribution Panel
1) 6H32 AIR SUPPLY CONT ENG 1
2) 6H33 AIR SUPPLY CONT ENG 2
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