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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
FUEL CONTROL SYSTEM - MAINTENANCE PRACTICES
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1. General
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A. Paragraph 2 gives the tasks to examine the engine control system for category 2 faults. The test is done with the central maintenance computer system (CMCS).
B. Paragraphs 3 and 4 are the tasks which change the EEC channel in command (from Channel A to Channel B or from Channel B to Channel A), as necessary for maintenance. This can be done while the engine operates (par. 3) or after an engine shutdown (par. 4).
TASK 73-21-00-862-014-N00
2. Engine Control System Inspection for Category 2 Faults
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A. General
(1)
This task examines the engine control system for category 2 faults. The test is done with the central maintenance computer system (CMCS).
(2)
You can use one of the steps that follow to find the Category 2 faults: the most recent leg of the CMCS Fault History, the CMCS Present Leg Faults, or the last three legs of the CMCS Fault History.
B.
References
(1)
AMM 45-10-00/201, Central Maintenance Computer System
(2)
FIM 71-CMCS Message Index
C.
Access
(1)
Location Zone
221 and 222 Control Cabin
D.
Use the CMCS Fault History to Find the Category 2 Faults
(1)
Find the CMCS Fault History menu (AMM 45-10-00/201).
S 862-037-N00
(2)
Do these steps to get access to the CMCS messages.
(a)
Find the <71 POWER PLANT prompt.
S 862-009-N00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(b) Push the line select key adjacent to the <71 POWER PLANT prompt.
S 862-044-N00
(3)
AIRPLANES WITH CMC S/W -009; Make sure none of these CMCS messages show: ~................................................................. | 71927 ENG-1 EEC SYSTEM TIME LIMITED DISPATCH FAULT CATEGORY 2 | ................................................................... | 72927 ENG-2 EEC SYSTEM TIME LIMITED DISPATCH FAULT CATEGORY 2 | ................................................................... | 73927 ENG-3 EEC SYSTEM TIME LIMITED DISPATCH FAULT CATEGORY 2 | ................................................................... | 74927 ENG-4 EEC SYSTEM TIME LIMITED DISPATCH FAULT CATEGORY 2 | 2.................................................................1
S 862-045-N00
(4)
AIRPLANES WITH CMC S/W -010;
Make sure none of these CMCS messages show: ~............................................................................ | 71927 ENG-1 CATEGORY 2 FAULT TIME LIMITED DISPATCH ENGINE CONTROL SYSTEM | .............................................................................. | 72927 ENG-2 CATEGORY 2 FAULT TIME LIMITED DISPATCH ENGINE CONTROL SYSTEM | .............................................................................. | 73927 ENG-3 CATEGORY 2 FAULT TIME LIMITED DISPATCH ENGINE CONTROL SYSTEM | .............................................................................. | 74927 ENG-4 CATEGORY 2 FAULT TIME LIMITED DISPATCH ENGINE CONTROL SYSTEM | 2............................................................................1
S 862-028-N00
(5) If one of the C2 fault messages show, find the flight leg (LEG:) of the C2 fault message.
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