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when the groundspeed is more than 20 knots and the airplane
becomes airborne. If the fault is still present at this time, it
becomes an in-flight fault.
In-Flight Faults Page
The in-flight faults page shows this data:
* Name of the LRU/sub-system
* Where the fault occurred (in flight or on the ground)
* Flight leg when the fault occurred.
All of the LRU/sub-systems that interface with the FMCS show
on the IN FLTS FAULTS pages. These LRU/sub-systems show
on pages 1, 2, and 3:
* Air data inertial reference system (ADIRS)
* Digital flight control system (DFCS)
* Distance measuring equipment (DME)
* Fuel quantity indicatng system (FQIS)
* Common display system (CDS)
* VHF omni-directional range (VOR)
* Multi-mode receiver (MMR)
* Clock
* Airborne communication and reporting system (ACARS)
* Control display unit (CDU).
* Flight management computer (FMC)
The LRU/sub-systems with a failure show the number from 1
through 9. This number is the flight leg when the fault occurred.
Flight number 1 is the last flight and flight number 9 is 9 flights
ago. The letter G shows that the fault was recorded on the
ground after the last flight.
NOTE: Ground faults are FMC and MCDU faults only.
If no faults were recorded by the FMCS for that LRU, the display
to the right of the LRU is blank.
Line select key 6L shows the INDEX prompt. This selects the
FMCS BITE INDEX page.
FMCS - TRAINING INFORMATION POINT - FMCS BITE PAGES - INFLIGHT FAULT
EFFECTIVITY
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To see more details about the possible LRU failures, you can
set the engineering code 300 into the scratch pad and push LSK
6R. This shows the flight select page.
Flight Select Page
This page shows a menu of the flight legs that have faults
recorded. If no faults were recorded by the FMCS for a
particular flight leg, the flight leg does not show on the CDU.
The engineering data can be selected for a particular flight leg
or ground fault from this page and show on the FLIGHT page.
Line select key 6L shows the INDEX prompt. This selects the IN
FLT FAULTS page.
Flight Page
This page shows the engineering data for the selected flight leg.
The faults show in chronological order
This engineering data shows for each fault:
* System code
* Label code
* Fault state
* Failure time
* Monitor code.
The system code shows the failed LRU or sub-system.
For an FMCS fault, the label code shows the failed circuitry or a
program fault in the FMC. For a sensor input fault, the label
code identifies the ARINC word with the fault.
Fault condition shows if the fault was steady (S) or intermittent
(I). All faults are initially recorded as a steady fault. If the fault
goes away, the indication changes to intermittent.
Failure time shows the GMT of the first occurrence of the fault.
This time does not change if the fault goes away and then
comes back.
For an FMCS fault, the monitor code shows the type of program
fault in the FMC. For a sensor input fault, the monitor code
shows the specific type of ARINC 429 failure.
These are the monitor codes for ARINC 429 failures:
* Rate (receive rate failure)
* Parity (parity failure)
* SSM (sign/status matrix failure)
* Reason (reasonableness failure).
Line select key 6L shows the INDEX prompt. This selects the
FLIGHT SELECT page.
FMCS - TRAINING INFORMATION POINT - FMCS BITE PAGES - INFLIGHT FAULT
EFFECTIVITY
SHZ ALL 34-61-00
Page 98.130
D633A101-SHZ1 Oct 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-61-00-057
FMCS - TRAINING INFORMATION POINT - FMCS BITE PAGES - INFLIGHT FAULT
FMCS - TRAINING INFORMATION POINT - FMCS BITE PAGES - INFLIGHT FAULT
EFFECTIVITY
SHZ ALL 34-61-00
Page 98.131
D633A101-SHZ1 Oct 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-61-00-057
General
To test the MCDUs, select CDU TEST on line select key (LSK)
2L, from the FMCS BITE page.
The CDU TEST is an interactive self test that shows the MCDU
characters. It also tests the MCDU push buttons and
annunciators.
FMCS CDU TEST Page
On this page you can select the CDU DSPLY TEST (LSK 5R) or
the CDU KEY TEST (LSK 5L).
FMCS DSPLY TEST Page
　
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