747-400 AMM 飞机维护手册 气动系统 PNEUMATIC SYSTEM(137)

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 2.  Remove the Precooler (Fig. 401)____________________
 A.  Equipment
 (1)  
Mat - Protective, Rubber Manufacturers Association Grade SC43, Neoprene Sponge, 1 inch (25 mm) thick, approximately 3 X 4 feet (90 X 120 cm) with warning streamers attached

 (2)  
A36001-45, Tool - Precooler Removal/Installation Equipment

 B.  
References

 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 36-00-00/201, Pneumatic System

 (3)  
AMM 54-62-00/201, Nacelle Strut Access Panels

 (4)  
AMM 71-11-04/201, Fan Cowl Panels

 (5)  
AMM 71-11-06/401, Core Cowl Panels

 (6)  
AMM 78-31-00/201, Thrust Reverser Systems

 C.  
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

 

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A
747-400
MAINTENANCE MANUAL

 (2)  Access Panel 415 Left Thrust Reverser Half - Engine 1 416 Right Thrust Reverser Half - Engine 1 417 Left Core Cowl Panel - Engine 1 452DL Access Door, Mid Lower Strut (Forward) - Engine 1
 425 Left Thrust Reverser Half - Engine 2 426 Right Thrust Reverser Half - Engine 2 427 Left Core Cowl Panel - Engine 2 462DL Access Door, Mid Lower Strut (Forward) - Engine 2
 435 Left Thrust Reverser Half - Engine 3 436 Right Thrust Reverser Half - Engine 3 437 Left Core Cowl Panel - Engine 3 472DL Access Door, Mid Lower Strut (Forward) - Engine 3
 445 Left Thrust Reverser Half - Engine 4 446 Right Thrust Reverser Half - Engine 4 447 Left Core Cowl Panel - Engine 4 482DL Access Door, Mid Lower Strut (Forward) - Engine 4
 D. Prepare to Remove the Precooler
 S 864-002
 (1)  Supply electrical power (AMM 24-22-00/201).
 S 864-003
 (2) Release the pressure in the pneumatic system (AMM 36-00-00/201).
 S 044-042
 WARNING: DO THE DEACTIVATION PROCEDURE FOR THE THRUST REVERSER TO
_______ PREVENT THE OPERATION OF THE THRUST REVERSER. ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
 (3)  Do the deactivation procedure for the thrust reverser for ground maintenance (AMM 78-31-00/201).
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747-400 MAINTENANCE MANUAL
SEE A
1. PRECOOLER SEE G
SEE C
FWD
SEE G
A

Engine Bleed Precooler Installation
Figure 401 (Sheet 1)

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747-400 MAINTENANCE MANUAL
SEE B
TUBE (TO PRSOV) 6. PRESSURE SENSE 
SEE  D 
2. BOLT 3. WASHER 4. NUT 5. BRACKET  SEE  E 

30. TEE  CONTROLLER) (TO PRV SENSE HOSE 9. PRESSURE  A  A 
NUT 31. JAM  SHOWN) 7. COUPLING 8. SEAL (NOT SEE F 
PRECOOLER EXHAUST FLANGE  7. COUPLING 8. SEAL (NOT SHOWN) SEE F 
32. O-RING  B 
A-A 
Engine Bleed Air Precooler Installation Figure 401 (Sheet 2) 

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