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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 C.  Access
 (1)  
Location Zones
 221 Control Cabin, Left
 222 Control Cabin, Right

 D.  
Prepare for the Test

 S 865-074
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-075

 (2)  
Prepare the CDU for the test:

 (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.

 (e)  
Push the NEXT PAGE key until you find <36 PNEUMATICS.

 (f)  
Push the LSK that is adjacent to <PNEUMATICS to show the GROUND TESTS menu for the pneumatic system.

 E.  
Bleed System Ground Test.

 S 745-076
 (1)  
Push the LSK that is adjacent to the applicable prompt
 (<BLEED SYS ELEC or <BLEED SYS APU or <BLEED SYS ENG).

 (a)  
When the TEST PRECONDITIONS page shows, make sure each instruction on the page is completed. (Push the NEXT PAGE key to show the subsequent pages.)

 (b)  
Push the LSK that is adjacent to START TEST>.

 S 745-113
 (2)  
Do the instructions that show on the CDU.

 S 745-077

 (3)  
When the test is completed, look for PASS or FAIL> adjacent to <BLEED SYS ELEC or <BLEED SYS APU or <BLEED SYS ENG.

 NOTE: If a PASS indication shows, no failures occured during the
____
 test.

 (a)  If FAIL> shows:
 1)  Push the LSK that is adjacent to FAIL> to see the GROUND TEST MSG pages for the failure.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 2) Push the NEXT PAGE key until you find all the GROUND TEST MSG pages. 3) Make a list of all CMCS messages, CMCS message numbers, and ATA numbers that show on the GROUND TEST MSG pages. 4) Go to the CMCS Message Index of the Fault Isolation Manual (FIM) to find the corrective action for each CMCS message.
 F. Put the Airplane in Its Usual Condition
 S 865-078
 (1)  Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

 TASK 36-11-00-795-025
 4.  Pneumatic Duct Leakage Test___________________________
 A. General
 (1)  This pneumatic duct leakage test procedure is intended for use after a complete system overhaul or a major repair, it may also be used at other intervals as desired. This test requires the use of special tools and equipment. The test examines all ducts and equipment from the auxiliary power unit (APU) and ground pneumatic connector to ducts downstream of the high pressure shutoff valve (HPSOV) and the intermediate pressure (IP) check valve on each engine.
 B. Special Tools and Equipment
 (1)  
Part Number: 2TE65B40004 Quantity: 3 (needed only if the leakage is more than permitted) Purpose: The block-out plate is to prevent the air flow through the air-conditioning pack flow control and shutoff valve.

 (2)  
Part Number: 2TE65B07917 Quantity: 1 Purpose: The duct section is to replace the APU check valve.

 (3)  
Part Number: BACC14AD06 Quantity: 5 Purpose: The cap assembly is to be install at these areas:

 -
The four hydraulic reservoir pressurization tubes

 -
The potable water pressurization boss on the pneumatic system crossover manifold

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