747-400
MAINTENANCE MANUAL

40. PLUG  SUPPLY PORT 
41. PACKING  5. O-RING 
42. SPRING  JAMNUT4. 
43. FILTER  3. ELBOW 
44. SLEEVE 
45. PACKING 
PRECOOLER 
PRESSURE 
14. FLANGE PLATE 
GROUND STUD 
SEE C 
FROM 
FLOW  FAN AIR 
TEMPERATURE 
3  SENSOR SIGNAL2 1 
PRESSURE PORT 
TEMPERATURE PORT 
6. ELBOW 
13. BOLT  7. UNION 
12. WASHER  8. O-RING 
11. NUT 
(8 LOCATIONS)  TERMINAL 
BLOCK 
9. WASHER 
10. NUT 
B 
15. SELF-LOCKING  BONDING 
NUT  JUMPER 
16. PRESSURE 
WASHER 
17. ELECTROPLATED 
BRASS PLAIN 
CLEAN  ELECTRICAL NUT 
THIS AREA 
18. CORROSION 
PROTECTION 
VALVE  WASHER 
GROUND STRAP 
19. LOCKWASHER 
20. GROUND STUD 

C

Fan Air Modulating Valve Installation
Figure 401 (Sheet 2)

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747-400 MAINTENANCE MANUAL
 S 014-028
 (2)  
Open the right fan cowl panel (AMM 71-11-04/201).

 S 014-037

 (3)  
Open the right core cowl panel (AMM 71-11-06/201).

 S 014-029
 WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO OPEN THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTION WHEN YOU OPEN THE THRUST REVERSER, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (4)  
Open the right thrust reverser (AMM 78-31-00/201).

 S 864-003

 (5)  
For the applicable engine, open this circuit breaker and attach a DO-NOT-CLOSE tag:

 (a)  
P6 Main Power Distribution Panel
 1) 6H32 AIR SUPPLY CONT ENG 1
 2) 6H33 AIR SUPPLY CONT ENG 2
 3) 6H34 AIR SUPPLY CONT ENG 3
 4) 6H35 AIR SUPPLY CONT ENG 4

 D. Remove the Fan Air Modulating Valve
 S 034-004
 (1)
Disconnect and put tags on the three wires from the terminal block.

 S 034-005

 (2)  
Disconnect the bonding jumper from the ground stud (20).

 S 034-006

 (3)  
Disconnect the three tubes from the valve (1).

 S 034-030

 (4)  
Remove the coupling (2).

 (5)  
Remove the fan air modulating valve (1).

 S 034-008

 (6)  
If you install a new fan air modulating valve, do the steps that follow to remove the fittings from the used valve:

 (a)  
Remove the elbow (6), union (7), and O-ring (8) from the TEMP port. 1) Discard the O-ring (8).

 (b)  
Remove an elbow (3), union (4), and O-ring (5) from the SUPPLY port and the cooling air port. 1) Discard the O-rings (5).

 S 024-031
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (c)  
Remove the eight bolts (13), washers (12), and nuts (11) to remove the flange plate (14).

 (d)  
Remove the ground stud (20) from the valve ground strap.

 TASK 36-12-04-404-009
 3.  Install the Fan Air Modulating Valve (Fig. 401)____________________________________
 A. Consumable Materials
 (1)  
D01062, Never-Seez, Pure Nickel Special, NSBT-8N (High temperature anti-seize cmpound)

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

 B.
References

 (1)  
AMM 20-11-15/401, Bonding Jumpers and Ground Leads

 (2)  
　
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