747-400 AMM 飞机维护手册 中央维护计算机系统(10)

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747-400 MAINTENANCE MANUAL
 (d)  FAULT HISTORY menu
 1)  The FAULT HISTORY menu provides a list of systems that have CMCS fault messages stored in NVM. The list is in ATA chapter sequence. A list of more than five systems continues on subsequent pages.
 2)  Selection of a system from the menu causes the FAULT HISTORY SUMMARY to be shown.
 (e)  FAULT HIST SUMMARY
 1)  The FAULT HISTORY SUMMARY shows a CMCS fault message and a list of flight legs during which the CMCS fault message was stored.
 2)  The total number of pages shows the number of different CMCS fault messages in the same ATA chapter.
 3)  The CMC has the capability to erase one or all CMCS fault messages from the CMC NVM. a) Selection of the <ERASE prompt erases all occurrences
 of one CMCS fault message from the CMC NVM. When the messages are erased, the indication ALL MESSAGES ERASED is shown.
 b)  Typing the code ERASE-FH-ALL into the CDU scratchpad on page 2 of the CMC MENU erases all messages from the CMC NVM. When the messages are erased, the indication ERASE COMPLETE shows.
 (f)  FAULT HISTORY MSG page
 1)  There is one FAULT HISTORY MSG page for each flight leg during which the CMCS message occurred. The total number of pages shows the number of occurrences of the CMCS fault message. The date and time that the CMCS fault message occurred is shown.
 2)  A caret (<) adjacent to the FDE shows that there are more FDEs correlated to the CMCS fault message. 3) The <READ SNAPSHOT prompt shows when there is a maintenance page snapshot that is related to the flight deck effect.
 (13) Other Functions
 (a)  
Three additional functions are available on the OTHER FUNCTIONS menu: Shop Faults, Input Monitoring, and Configuration. These functions are not usually necessary for line maintenance.

 (b)  
Also on the OTHER FUNCTIONS menu are these prompts which are used to enable or inhibit a flight leg transition: ENABLE FLT LEG ROLL and INHIBIT FLT LEG ROLL. Only one prompt shows at a time. Selection of one prompt causes the other prompt to show. 1) Selection of INHIBIT FLT LEG ROLL makes sure the flight leg

 does not change.
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747-400 MAINTENANCE MANUAL
 2)  Selection of ENABLE FLT LEG ROLL allows the flight leg to change the next time the first engine is started (or, if the engines are running, when the last door is closed). Selection of ENABLE FLT LEG ROLL is the same to the CMC as the engines reaching take-off thrust with the parking brake released.
 3)  Selection of INHIBIT FLT LEG ROLL or ENABLE FLT LEG ROLL must be for only one CMC. The command is automatically sent to the other CMC so that the flight leg numbers stay the same in the two CMCs.
 (14) Shop Faults (Fig. 16)
 (a)  
The shop faults function supplies shop relevant fault (SRF) data for a selected LRU. The CMCS transmits a signal to an LRU to cause the LRU to transmit SRF data to the CMC. The SRF data is shown on a CDU.

 (b)  
SHOP FAULTS page

 1)  The SHOP FAULTS page shows a list of all systems that have LRUs with SRF data. The list is in ATA chapter sequence.

 (c)  
SHOP FAULTS LRUS page

 1)  The SHOP FAULTS LRUS page shows the LRUs in the selected system that have available SRF data.

 (d)  
SHOP FAULTS DATA page

 1)  The SHOP FAULTS DATA page shows SRF data that the LRU transmits to the CMC.
 (15) Input Monitoring (Fig. 17)
 (a)  
The input monitoring function permits monitoring of inputs to the CMCs or the EIUs. Eight different inputs to the EIUs can be monitored at the same time. Only one input to the CMC can be monitored at a time.

 (b)  
INPUT MONITORING pages 1) The INPUT MONITORING page is first shown without data. The CDU keyboard is used to select the location to monitor.

 2)  The page then shows three data samples. The newest sample is shown above the other two samples. A new data sample is shown each 0.5 seconds.
 3)  Selection of the <FREEZE prompt stops the display of new data samples. Selection of the <RESUME prompt starts the display of new samples.
 4)  The data can be shown in binary or hexadecimal numbers. Some data can also be shown in decimal numbers. 5) Eight pages can be shown. Each page shows data from a different input.
　
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