28.
 SCREW

(HOLDS TUBE (24))
27. CLAMP
(HOLDS
TUBE (23))

I
Engine Bleed Air Recooler Installation Figure 401 (Sheet 5)
28. SCREW
27. CLAMP (HOLDS TUBE (26))
1. PRECOOLER
27. CLAMP (HOLDS TUBE (24))
3. WASHER
29. NUT
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A

28. SCREW
27. CLAMP (HOLDS WIRE BUNDLE)
27. CLAMP (HOLDS TUBE (26))
1. PRECOOLER
3. WASHER
29. NUT
3.
 WASHER

4.
 NUT

3.
 WASHER

4.
 NUT

27. CLAMP (TYP)
747-400
MAINTENANCE MANUAL

27. CLAMP
(HOLDS
TUBE (24))

36.
 SCREW

28. SCREW

36. SCREW
37.
 BRACKET

1. PRECOOLER
J
TUBE (REF)
38. CLAMPSHELL HALF
CLAMPSHELL HALVES ARE THE SAME AND TUBE (REF)
FIT TOGETHER
CLAMPSHELLS FIT ON A TUBE AND HOLD WITHOUT A CLAMP
Engine Bleed Air Precooler Installation
Figure 401 (Sheet 6)

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747-400 MAINTENANCE MANUAL
 (c)  
Remove the tee (30), jamnut (31), and O-ring (32) from the lower corner of the forward left side of the precooler. 1) Discard the O-ring (32).

 (d)  
Remove the bushing (20), barrel nut (19), and barrel nut retainer (18) from the upper corner of the forward left side of the precooler.

 TASK 36-12-01-404-020
 3.  Install the Precooler (Fig. 401)_____________________
 A. Equipment
 (1) A36001-45, Tool - Precooler Removal/Installation Equipment
 B. Consumable Materials
 (1)  
D01062, Never-Seez, Pure Nickel Special, NSBT-8N
 (High temperature anti-seize compound)

 (2)  
G00095, Detector - Leak, Leak-Tek (160X)

 (3)  
D00062, Lubricant - Pneumatic System Thread, FS 1292 (Fluor-Silicone) MIL-G-4343

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

 (2)  
AMM 36-12-04/401, Fan Air Modulating Valve

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

 (4)  
AMM 71-00-00/201, Power Plant

 (5)  
AMM 71-11-04/401, Fan Cowl Panels

 (6)  
AMM 71-11-06/201, Core Cowl Panels

 (7)  
AMM 78-31-00/201, Thrust Reverser System

 D. 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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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
 E. Install the Precooler
　
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