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 AIR SUPPLY CONTROL AND TEST UNIT (ASCTU) - REMOVAL/INSTALLATION
_______________________________________________________________
 1.  General_______
 A.  This procedure contains two tasks. The first task removes the air supply control and test unit (ASCTU). The second task installs the ASCTU.
 B.  The ASCTU is an electronic module. It is found in the E2 electronic rack in the main equipment center. It is aft of the wheel well for the nose landing gear.
 TASK 36-11-30-004-001
 2.  Remove the Air Supply Control And Test Unit (ASCTU) (Fig. 401)___________________________________________________
 A.  References
 (1)  
20-11-22/401, Rack-Mounted Electrical/Electronic Module

 (2)  
IPC 36-11-30 Fig. 1

 B.  
Access

 (1)  
Location Zone
 118 Main Equipment Center

 C.  
Prepare to remove the ASCTU.

 S 864-002
 (1)  
Open the applicable circuit breaker that follows and attach a DO-NOT-CLOSE tag:

 (a)  
On the 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 ASCTU

 (1)  
Remove the ASCTU electronic module (Ref 20-11-22/401).

 S 024-003
 TASK 36-11-30-404-004
 3.  Install the Air Supply Control And Test Unit (ASCTU) (Fig. 401)____________________________________________________
 A.  References
 (1)  
20-11-22/401, Rack-Mounted Electrical/Electronic Module

 (2)  
24-22-00/201, Manual Control

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 36-11-30
 ALL  ú ú 01 Page 401 ú Feb 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

E2 ELECTRONIC RACK

A

Air Supply Control and Test Unit (ASCTU) Installation
Figure 401

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 ALL  ú ú 01 Page 402 ú Oct 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (3)  
45-10-00/201, Central Maintenance Computer System - Maintenance Practices

 (4)  
IPC 36-11-30 Fig. 1

 B.
Access

 (1)  
Location Zone
 118 Main Equipment Center

 C.
Install the ASCTU

 S 424-005
 (1)  
Install the ASCTU electronic module (Ref 20-11-22/401).

 S 864-006

 (2)  
Remove the DO-NOT-CLOSE tag and close the applicable circuit breaker that follows:

 (a)  
On the 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

 

 S 864-007
 (3)  
Supply electrical power (Ref 24-22-00/201).

 D.
Post Installation Test of the ASCTU

 S 744-011
 (1)  
Do the steps that follow:

 (a)  
Push the MENU key on the CDU to show the MENU.

 (b)  
Push the line select key (LSK) that is adjacent to <CMC to show the CMC MENU.

 (c)  
If <RETURN shows after you push the LSK, push the LSK that is adjacent to <RETURN until you see the CMC MENU.

 (d)  
Push the LSK that is adjacent to <GROUND TESTS to show the GROUND TESTS menu.

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 36-11-30
 ALL  ú ú 01 Page 403 ú Feb 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
　
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