(e)
Push the NEXT PAGE key until you find <21 AIR CONDITIONING.
(f)
Push the LSK that is adjacent to <21 AIR CONDITIONING to show the GROUND TESTS menu for the air conditioning system.
(g)
Push the NEXT PAGE key until you find <SHUTOFF / DUMP VLV
NOTE: If INHIBITED shows above <SHUTOFF / DUMP VLV the test will not operate.
(h)
If INHIBITED shows above <SHUTOFF / DUMP VLV: 1) Push the LSK that is adjacent to the test prompt. 2) Do the steps shown on the CDU. 3) Push the LSK that is adjacent to <RETURN to show the ground
test menu again.
S 714-004
(4) Push the LSK that is adjacent to SHUTOFF / DUMP VLV.
(a)
When the TEST PRECONDITIONS page shows, make sure each instruction on the page is completed. (Push the NEXT PAGE key to see subsequent pages.)
(b)
Push the LSK that is adjacent to START TEST>.
NOTE: IN PROGRESS shows during the test.
____
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S 714-005
(5) When IN PROGRESS goes out of view, look for PASS or FAIL> adjacent to <SHUTOFF / DUMP VLV
NOTE: If a PASS indication shows, no failures occurred 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. 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.
S 794-005
(6) Do a leak check of the valve installation:
(a)
Supply pneumatic power (AMM 36-00-00/201).
(b)
Put the applicable PACK selector (1 or 3), on the P5 panel, to the NORM position.
(c)
Feel for leaks around the valve.
1) Small leaks are permitted.
2) You must repair a large leak.
E. Put the Airplane Back to its Usual condition
S 414-006
(1)
Close the applicable access door, 191H-L or 191H-R
(AMM 06-09-03/201).
S 864-010
(2)
Turn the applicable PACK selector, on the P5 panel, to the OFF position.
S 864-012
(3)
Release the pressure in the pneumatic system, if it is not necessary (AMM 36-00-00/201).
S 864-014
(4)
Remove the electrical power, if it is not necessary
(AMM 24-22-00/201).
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747-400 MAINTENANCE MANUAL
HEAT EXCHANGER - REMOVAL/INSTALLATION
_____________________________________
1. General_______
A. This procedure has instructions to remove and install the heat exchangers. A heat exchanger is installed in each air cooling pack. The heat exchanger, the ram-air outlet door, and the ram-air outlet door actuator must be removed and installed as a unit.
TASK 21-51-03-004-001
2. Heat Exchanger Removal (Fig. 401)______________________
A. Special Tools and Equipment
(1)
ME65B40000-1 Heat Exchanger Lifting Tool
(2)
2ME65B40006 Heat Exchanger Lifting Tool
B. References
(1)
AMM 06-09-03/201, Body Section 44 Access Doors and Panels
(2)
AMM 21-62-05/401, Ram Air Exit Door Actuator
(3)
AMM 21-62-12/401, Ram Air Exit Door Limit Switch
(4)
AMM 36-00-00/201, Pneumatic System
(5)
AMM 45-10-00/201, Central Maintenance Computer System
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