747-400 AMM 飞机维护手册 中央维护计算机系统(7)

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 (7)  Present Leg Faults (Fig. 10)
 (a)  The present leg faults function provides information on flight deck effects (FDEs) and CMCS fault messages that were recorded during the present flight leg, whether or not they are still active. Present leg faults include these: 1) CMCS fault messages recorded during the present flight leg. 2) FDEs that are correlated to the recorded CMCS fault
 messages.
 3)  Latched EICAS status messages (correlated or not).
 4)  CMCS fault messages that are correlated to latched EICAS
 status messages.
 (b)  
CMCS fault messages are recorded (stored in non-volatile memory (NVM)) only when the fault occurs during a flight phase that is in the operational period for that fault or system. In this way, nuisance fault indications that occur due to normal maintenance procedures are not included.

 (c)  
PRESENT LEG FAULTS page

 1)  The PRESENT LEG FAULTS page provides a list of FDEs (flight deck effects) that occurred during the present flight leg. The FDEs are shown in sequence of occurrence; the last to occur is shown first. A list of more than four FDEs continues on subsequent pages.
 2)  The level of the FDE (such as status or caution) and the fault code are shown above each FDE.
 3)  Each FDE with an asterisk (*) above it is also shown on the EICAS display. EICAS status messages can be erased from the EICAS display with the ERASE> and <ERASE STATUS prompts.
 4)  The ERASE> prompt shown adjacent to a latched EICAS status message is used to remove that EICAS message from the EICAS display. If the fault which caused the message is not active and you push the ERASE> prompt, the EICAS message is erased from the EICAS display. The asterisk (*) and the ERASE> prompt adjacent to the FDE are erased from the CDU display. If the fault is still active when you push the ERASE> prompt, the message stays on the EICAS display. Up to 10 seconds can be necessary to erase an EICAS message.
 5)  The <ERASE STATUS prompt is used to remove EICAS status messages from the EICAS display all at one time. When you push the LSK adjacent to the <ERASE STATUS prompt, all EICAS messages caused by faults that are no longer active are erased from the EICAS display. The asterisk (*) and the ERASE> prompt adjacent to the corresponding FDEs are erased from the CDU display. The messages that correspond to faults that are still active stay on the EICAS display. Up to 10 seconds can be necessary to erase the EICAS messages.
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747-400 MAINTENANCE MANUAL
 6)  Each FDE with an adjacent caret (<) has at least one CMCS message correlated to it. These CMCS messages are shown on the PRESENT LEG MSG pages. There is a PRESENT LEG MSG page for each FDE that has an adjacent caret (<).
 (d)  
PRESENT LEG MSG page 1) Most PRESENT LEG MSG pages show a FDE and the CMCS fault message that is correlated to that FDE. 2) An asterisk adjacent to the CMCS fault message shows that the fault that caused the CMCS message is active. 3) An asterisk (*) above the FDE indicates that the FDE is active and is shown on the EICAS display. 4) A caret (<) adjacent to the FDE shows that there are more FDEs correlated to the CMCS fault message. 5) The <READ SNAPSHOT prompt shows when there is a maintenance page snapshot that is related to the flight deck effect.

 6)  The total number of pages in the page indication shows the number of CMCS fault messages that are correlated to the FDE.

 (e)  
NON-FDE FAULTS

 1)  The NON-FDE FAULTS prompt on the last PRESENT LEG FAULTS page allows the display of all CMCS fault messages that are not correlated to a FDE.
 2)  On the PRESENT LEG MSG page for a non-FDE fault, the area where the FDE is usually shown is blank.
 (8)  Confidence Tests (Fig. 11)
 (a)  
Confidence tests are used to make sure specific systems are functioning properly. Confidence tests are system ground tests that the flight crew traditionally has access to. They can be performed in flight unless the internal logic of the system inhibits the test.

 (b)  
CONFIDENCE TESTS page

 1)  The CONFIDENCE TESTS page allows tests to be run and shows the test results. When an INHIBITED indication is shown above the test name, the test cannot operate. (The caret (<) is not shown adjacent to a test that cannot operate.)
　
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