(8) MCDP Flight Fault Display Message Format (Fig. 9)
(a) The flight fault mode displays three groups of flight faults: LAST, PREVIOUS, and PRESENT. The PRESENT flight fault function is not usable because the EICAS Maintenance Panel is disabled in flight (Ref 31-41-00). 1) The historical flight tag is incremented during an auto
power-on if the MCDP receives a store data bit from one or more FCCs, FMCs and TMC (FCCs channel not engaged). The store data bit is transmitted to the MCDP by the computers when the following sequence of events occur: a) IRS Ground Speed is greater than 100 knots.
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b) Air/ground relay equals IN AIR c) IRS Ground Speed is less than 40 knots. d) Air/ground relay equals ON GROUND
(b) The flight fault review manager routine controls the flight fault display. The executive routine enables the review manager routine when it receives the FLT FAULT REVIEW ENABLE signal. The signal is generated after a manual power-up or flight fault mode is selected while in the ground test mode. The flight fault review enable is held high when the following conditions are present: MCDP power OK; ground test not required; ground test not enabled; FLT FAULTS required selected, or power latched ON flip-flop set; and auto ON not engaged. The flight fault mode is disabled when the power is turned off or the ground test mode is selected.
HISTORICAL FLIGHT TAG
00- PRESENT FLIGHT FAULT
01- LAST FLIGHT FAULT
02-99 PREVIOUS FLIGHT FAULT FLIGHT DECK EFFECT
OR DIAGNOSTIC CODE
FAULTY LRU OR TWO LRU'S SEPARATED BY A / INDICATING AN INTERFACE FAILURE
MCDP Flight Fault Display Message Format
Figure 9
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(c) Last Flight Faults 1) After the flight fault review routine is initialized, the FLT FAULT light/switch is turned on and the message LAST FLT FAULT? is displayed. The operator pushes the YES/ADV button to select the sub-mode being offered. Pushing the NO/SKIP pushbutton causes the MCDP to exit the LAST FLT FAULT routine and enter the PREVIOUS FLT FAULT routine. 2) Before displaying the last flight faults, the routine checks all ARINC 429 ports for valid interface data. The MCDP displays NO INFC + computer and position for each inactive port. Each computer interface fault message is displayed by pushing the YES/ADV button to progress to the next fault. 3) After all interface faults have been displayed, the Last Flight Faults of the valid computers are displayed. The YES/ADV pushbutton is used to review them. The message ALL LAST FLIGHT FAULTS DSPLY is displayed after all faults have been displayed. Exiting the Last Flight Fault mode, before the ALL LAST FLIGHT FAULTS DSPLY message is displayed, is done by pushing the NO/SKIP pushbutton. Pushing the NO/SKIP or YES/ADV pushbutton when the ALL LAST FLT FAULTS DSPLY message is displayed causes the routine to advance to the Previous Flight Fault routine. The GRD TEST switch selects the ground test mode only when the aircraft is on the ground. The ON/OFF pushbutton causes the MCDP to power-down.
4) The Last Flight Fault messages have the flight segment 01 preceding the flight deck effect message on the first line of the display. The flight fault is displayed on line two.
(d) Display Previous Flight Faults
1) The operation of the Previous Flight Fault routine is similar to the Last Flight Fault routine with the exception that the flight segment number ranges from 02 to 99. The flight segment number indicates how many flights ago the fault occurred.
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