-
the date on which the failure occurred
-
the time when the failure first occurred
-
the flight in which the failure occurred. (This shows as a negative number. EG, -01 is the last flight and -02 is the flight before that).
-a code that identifies the failure condition (Ref. Failure Condition Tables)
-
the number of times in a flight that the same failure occurred
-
the flight phase when the failure first occurred
-a SRU identification letter. (The letter A tells you that the failure is external to the LGCIU. The letters B thru J tells you that the failure is of a component in the LGCIU).
The data for a specified failure goes into the NOVOL RAM. At the same time, the failure message also goes to the CFDIU (CFDS Normal Mode). To
1EFF : ALL 1 32-69-00Page 4 1 1 Feb 01/98 1 1 1CES 1 see all the failure data kept in the NOVOL RAM, (the failure messages and the other related data), it is necessary to make the applicable selections on an MCDU (CFDS Menu Mode).
D. Landing Gear Simulation Function
The L/G simulation function is an aid to the maintenance technicians during the trouble shooting and the maintenance tasks. With this function it is not necessary to:
-lift the aircraft on jacks (to operate the proximity sensors on the
shock absorbers)
- operate the L/G.
During the simulation of a L/G configuration the:
-LGCIU supplies output data that agrees with the simulated, and not the correct, configuration
-ARINC 429 and discrete signals go to the applicable interface systems (Ref. 32-62-00).
E. CFDS
The CFDS has two modes of operation, Normal and Menu.
Normal Mode
R The continuous failure monitoring operates only in normal mode. It
R continuously sends the status and the failure messages (Ref. LGCIU BITE
R Messages) to the CFDS. The CFDIU keeps the failure messages in its memory until the start of the subsequent flight. These messages can be seen when
R you set the MCDU to CFDS-LAST LEG REPORT (Ref. 31-32-00). Menu Mode
(Ref. Fig. 001, 002)
This mode is only available while the aircraft is on the ground. With a MCDU set to LGICU-1 or LGCIU-2, the applicable LGCIU sends a menu of the failure data and test items to the MCDU. Each LGCIU menu contains these items:
-LAST LEG REPORT
-PREVIOUS LEG REPORT
-LRU IDENTIFICATION
-TROUBLE SHOOTING DATA
-GROUND SCANNING
-TEST
-LANDING GEAR SIMULATION.
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MCDU - LGCIU Menu and Replies to Key Selection
Figure 001 (SHEET 1)
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1 1 Feb 01/98
1 1
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MCDU - LGCIU Menu and Replies to Key Selection
Figure 001 (SHEET 2)
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1 1 Feb 01/98
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R MCDU - PREVIOUS LEGS REPORT and TROUBLE SHOOTING DATA Displays Figure 002
1EFF : ALL 1 32-69-00Page 8 1 1 Feb 01/02 1 1 1CES 1 1EFF : ALL 1 32-69-00Page 9 1 1 Aug 01/03 1 1 1CES 1 If an aircraft flies with a failure that first occurred on the ground, the display page shows a ground flight phase number (EG, 01 on the applicable line of data).
R R R NOTE : Continuous failure monitoring does not operate in menu mode. BITE____ failure monitoring operates only momentarily at the start of the Test selection.
RR R (1) LAST LEG REPORT This display shows the failure messages kept in the NOVOL RAM during the last flight. It can show a maximum of two failure messages at one time. The display will show more failure messages when you use the NEXT PAGE key. This will have no effect if the display shows all of the failure messages.
(2) PREVIOUS LEG REPORT
This display shows the failure messages (maximium of 30) kept in the NOVOL RAM during the last 63 flights. At the top of the display, the last message kept shows first.
Each page of the display shows a maximum of three failure messages. The NEXT PAGE key lets you see the subsequent failure messages. When the last message shows and you use the NEXT PAGE key, it causes the first failure message to show again.
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