C. Flight-Fault Memory History Procedure
(1) Do this procedure, if required, to examine the Flight-Fault Memory history for hard or intermittent faults.
(a)
Push and release either of the two switches on the front panel of the LRRA Receiver/ transmitter to start the BITE self-test.
(b)
Do these steps when the BITE self-test is complete to show maintenance mode pages.
NOTE: There is no five minute timeout in the Maintenance Mode if a switch is not pushed.
1) Push the MAINT switch to enter the Maintenance Mode.
2) Use the MORE switch to scroll through the Maintenance Mode pages.
NOTE: After the last page is shown and no failures are stored for previous flight legs, a push of the MORE switch returns to the first Maintenance Mode page. 3) When the page FAILURES HAVE BEEN RECORDED FOR PREVIOUS FLIGHT LEGS is shown, this begins the Flight-Fault Memory Mode. 4) Push the YES switch to see the most recent flight leg (00).
NOTE: The unit stores data for 64 flight legs that contain faults or no faults. Four pages are required for each flight leg. The first page contains the date, flight number, aircraft number, and departure/destination stations. Three data pages follow for each flight leg to contain the possible failures. The data page shows FC (fault code), UTC (time), and R (fault repetition count).
EFFECTIVITY SIL ALL 34-33 TASK 801
D633A103-SIL BOEING PROPRIETARY -Copyright # Unpublished Work -See title page for details Page 202 Feb 15/2010
NOTE: R greater than 0 indicates an intermittent fault. The number shows how many times the fault occurred. 5) Use the MORE switch to scroll through the flight leg data pages.
NOTE: After the last page is shown for the oldest flight leg, a push of the MORE switch returns to the first flight leg page. 6) Check the data pages for fault codes (FC). a) See the fault code table to determine fault location.
Fault Code Table
FAULT CODE (FC) FAULT LOCATION REFERENCE DATA
Any A Code Rear connector program pins WDM 34-33-11 or WDM 34-33-21
All B, C, D, E (except Em and En), F, G, H, I, M, Q, S and Z Radio Altimeter R/T FIM 34-33 TASK 802
Em Transmit Antenna or Coax Cable FIM 34-33 TASK 803
En Receive Antenna or Coax Cable FIM 34-33 TASK 804
b) If you have an intermittent fault, then follow your airline’s policy for intermittent faults.
7) Review previous flight legs as necessary.
SIL ALL -------------------------END OF TASK ---------------------------
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