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A 747-400 MAINTENANCE MANUAL
(2) S 436-014Connect the heat exchanger hydraulic tubes to the adapter fittings at the rear spar. (a) Tighten the B-nuts to 450-550 pound-inches (50-60 N.m).
(3) S 866-015Supply electrical power (AMM 24-22-00/201).
(4) S 866-016Pressurize the hydraulic system (AMM 29-11-00/201).
(5) S 866-017Pressurize the pneumatic system (AMM 36-00-00/201).
(6) S 796-018Check for leakage.
(7) S 016-019Install the hydraulic access panels (AMM 06-09-08/201).
(8) S 616-020Service the hydraulic fluid reservoir (AMM 12-12-01/301).
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A
747-400 MAINTENANCE MANUAL
PRESSURE MODULE - MAINTENANCE PRACTICES
_______________________________________
1. General_______
A. This procedure contains these 12 tasks:
(1)
Pressure module removal.
(2)
Pressure module installation.
(3)
Pressure filter element removal.
(4)
Pressure filter element installation.
(5)
Pressure relief valve removal.
(6)
Pressure relief valve installation.
(7)
Pressure check valve removal.
(8)
Pressure check valve installation.
(9)
Differential pressure indicator removal.
(10)
Differential pressure indicator installation.
(11)
Ground service disconnect removal.
(12)
Ground service disconnect installation.
B.
You must open the doors on the trailing edge fairing to do these tasks.
TASK 29-11-23-002-001
2. Pressure Module Removal (Fig. 201)_______________________
A. References
(1)
AMM 12-12-01/301, Hydraulic Systems
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 29-11-00/201, Main Hydraulic Supply System
(4)
AMM 36-00-00/201, Pneumatic System
(5)
AMM 54-62-00/201, Nacelle Strut Access Panels
B.
Access
(1)
Location Zone
454 System 1 - Strut Aft Fairing
464 System 2 - Strut Aft Fairing
474 System 3 - Strut Aft Fairing
484 System 4 - Strut Aft Fairing
(2)
Access Panel 454AL Trailing Edge Fairing Doors - System 1 464AL Trailing Edge Fairing Doors - System 2 474AL Trailing Edge Fairing Doors - System 3 484AL Trailing Edge Fairing Doors - System 4
C.
Procedure
(1)
Supply electrical power (AMM 24-22-00/201).
S 012-003
(2)
Open the left door on the applicable trailing edge fairing (AMM 54-62-00/201).
S 862-002
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A
747-400 MAINTENANCE MANUAL
ENGINE NACELLE STRUT
SEE A
PRESSURE TUBE FOR THE ENGINE-DRIVEN PUMP (PORT IN A)
SYSTEM PRESSURE BOLT
TUBE (PORT OUT) WASHER NUT (4 LOCATIONS)
PRESSURE
MODULE
SEE B RESERVOIR
TUBE (PORT RES)
PRESSURE HOSE FOR
PRESSURE SWITCH FORTHE DEMAND PUMP THE ENGINE-DRIVEN PUMP
(PORT IN B) PRESSURE SWITCH FOR THE DEMAND PUMP
PACKINGS
FILTER
BACKUP RING (QUANTITY 4)
BACKUP RING FILTER
PACKING CHECK VALVE FOR
BACKUP RING
THE GROUND DISCONNECT BACKUP RING
PACKING CHECK VALVE FOR
BACKUP RINGTHE DEMAND PUMP
A
Pressure Module and Component Installation Figure 201 (Sheet 1)
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