(5)
To simulate N1 RPM it is necessary to operate the engines.
NOTE: Before operating the engines refer to 71-00-00, and
____ observe all necessary precautions while operating the engines.
(6)
Operate engine 1 at idle (or above idle) RPM. Verify that the PMS CDU display of N1 for engine 1 corresponds to the N1 indicator reading for engine N1. Shut down engine.
(7)
Repeat steps (6) and (7) for engines 2, 3 and 4.
(8)
Press CDU CLEAR key.
(9) If the PMS is no longer required, restore airplane to normal. AJ. Pneumatic Air Conditioning System Interface.
(1)
If required prepare for test as described in paragraph D.
(2)
Press PERF DATA key on the PMS CDU. Push the CDU slew switch as required to advance the display to PERF DATA.....2/4 page. The left part of data line 3 indicates the air conditioning pack status for each pack as follows:
'PKS X X X'
(1) (2) (3)
The right part of data line 3 indicates the wing isolation valve position status for the left and for the right wings as follows:
'ISOL X X'
(LEFT) (RIGHT)
(3) Provide pneumatic power to the airplane pneumatic system (Ref 36-00-00, Maintenance Practices).
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(4) Close the left and right wing isolation valves by placing the ISOLATION VALVES switches to the closed position (Ref 36-11-00, Maintenance Practices). (The ISOLATION VALVES switches are located on the air conditioning module, on the P4 panel). With both the left and right wing isolation valves closed, verify that the right part of data line 3 on the CDU display indicates as follows:
'ISOL '
NOTE:____ Allow 15 seconds after switch opertaion before confirming display.
(5) Open the left and the right wing isolation valves in succession by operating the ISOLATION VALVES switches on the P4 panel. Verify that the display changes as follows:
WING ISOLATION VALVE PMS CDU DISPLAY
PERF DATA.....2/4 PAGE. LEFT RIGHT DATA LINE 3__________________________________________________________________
CLOSED CLOSED ISOL - -
OPEN CLOSED ISOL L -
OPEN OPEN ISOL L R
(6) (7) Allow both the left and the right wing isolation valves to remain in the open position.On IB airplanes, turn on the air conditioning (A/C) packs in succession, by operating the A/C pack switches on the A/C module on the P4 panel. Verify that the corresponding A/C pack is operating. For A/C pack operation Ref 21-00-00, Maintenance Practices. Verify that the CDU display appears as follows as each A/C pack switch is operated.
NOTE:____ Use only ground cart air or engine air to operate all a/c packs. Test results will be different if pack no.2 is fed from APU bleed.
A/C PACK PMS CDU DISPLAY
PERF DATA.....2/4 PAGE.
NO. 1 NO. 2 NO. 3 DATA LINE 3
__________________________________________________________________
OFF OFF OFF PKS - -ON OFF OFF PKS 1 - -ON ON OFF PKS 1 2 -ON ON ON PKS 1 2 3
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(8) On AF airplanes, turn on the air conditioning (A/C) packs in succession, by operating the A/C pack switches on the A/C module on the P4 panel. Verify that the corresponding A/C pack is operating. For A/C pack operation ref 21-00-00, Maintenance Practices. Verify that the CDU display appears as follows as each A/C pack switch is operated.
NOTE: Use only ground cart air or engine air to operate all a/c
____ packs. Test results will be different if pack no.2 is fed from APU bleed.
A/C PACK PMS CDU DISPLAY PERF DATA.....2/4 PAGE. NO. 1 NO. 2 DATA LINE 3
__________________________________________________________________
OFF OFF PKS - - -ON OFF PKS 1 - -ON ON PKS 1 2 3
OFF ON PKS - 2 -
(9)
Shut down the A/C packs (Ref 21-00-00).
(10)
Depressurize the pneumatic system (Ref 36-00-00).
(11)
Press CDU CLEAR key.
(12) If the PMS is no longer required, restore airplane to normal. AK. Engine Bleed Air and Nacelle Anti-Ice Interface.
(1)
If required prepare for test as described in paragraph D.
(2)
The following checks are to be performed during an engine run period to verify 'bleed air valve (pylon valve) position' and 'nacelle anti-ice valve position'.
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本文链接地址：747飞机维护手册AMM CHAPTER 34 - NAVIGATION 第34章导航4(157)
