(a) Handling of faults
1_ Activation
- After manual selection of the function, the CFDIU monitors
the internal and external faults.
- The ATA reference and the time at which the fault is
detected are associated with each fault message.
2_ Presentation capacity
Presentation capacity is 5 failures while new faults delete
the oldest ones.
3_ The presentation of this function is identical to that of the
LAST LEG REPORT.
4_ During function progress the CFDIU presents the message: IN
PROGRESS (50 SEC) and a RETURN/STOP key is presented to enable
function interruption and return to CFDIU BITE menu.
5_ Criteria of monitoring
- Monitoring is activated on function selection for the
following systems:
R 1EFF : 001-049, 051-099, 101-105, 151-154, 1 31-32-00Page B30 1201-207, 1May 01/05 1 1 1CES 1 FAC 1, FDIU, DMC 1, AMU, CIDS 1, MCDU, PRINTER, CLOCK, CFDIU
-For the FWCs, monitoring is described below.
(b) Description of faults Monitoring and associated message are identical to the case of the LAST LEG REPORT.
NOTE : This manually activated monitoring does not entail
____ acquisition of monitored parameters by the CFDIU.
(4) POWER-UP TEST RESULT function The purpose of this function is to present the CFDIU internal components detected faulty during the last Power-Up Test. The ATA reference 31-32-34 is associated with each fault message.
(a) In the event of fault, the following messages are displayed:
-
CFDIU I/0 ARINC 1 (or 2 or 3) for fault of multiplexor 1, 2 or 3
-
CFDIU I/0 DISCRETE 1 (or 2) for fault of discrete inputs/outputs 1 or 2
-
CFDIU BITE MEMORY for fault in NVM
-
CFDIU for any other fault of the normal channel
-
CFDIU BACK UP for any fault of the back-up channel.
R **ON A/C 106-149, 155-199, 208-299, 301-399, 401-499,
D. Menu Mode of the CFDIU
The menu mode of the CFDIU comprises the following four functions:
-LAST LEG REPORT
-LRU IDENTIFICATION
-POWER UP TEST RESULT
-GROUND SCANNING.
The menu mode is possible only during the flight phases corresponding to NULL.
(1) LAST LEG REPORT function
The purpose of this function is to memorize the internal or external faults in flight, whether these faults are already present on the ground or not. In the general case, these faults are detected through permanent monitoring and in some cases, through the power-up test.
1EFF : ALL 1 31-32-00Page B31 1 1 Aug 01/05 1 1 1CES 1
(a) Handling of faults
1_ Memorization
- During the flight phases corresponding to DC1, the CFDIU
memorizes the internal and external fault except the MCDU 3
fault (which is not monitored under DC2).
- During the flight phases corresponding to DC2, the CFDIU
memorizes the internal faults only.
- The ATA reference, the time at which the failure occurred
and the flight phase during which it occurred are associated
with each fault message.
If an external/internal fault was present on DC2/DC1
transition and is still present, the time associated with
this fault is the time of the DC2/DC1 transition.
The same applies to the internal faults on NULL/DC2
transition.
- Processing of faults detected during the power-up tests is
described in the paragraphs above.
2_ Memorization capacity
Memorization capacity is 5 faults, while new faults delete the
oldest ones.
3_ Criteria of monitoring
- Reminder of acquisition of the components which are internal
or external to the CFDS:
* Aircraft configuration parameters :
. FWC 1/2 (label 013)
. DMC 1 (label 305)
. AMU (label 350)
. CIDS (label 146)
and engine serial number parameter : DMC 1 (label 46,47):
These labels are acquired on the ground 45 s after power-up
(i.e. further to long power cutoff) and on flight phase 1/2
transition.
* Parameters from :
. FAC 1 (labels 233 ---> 236, 040 --->042)
. FDIU (labels 301 ---> 304):
These labels are acquired at each flight phase transition
and at power-up.
* Parameters from :
. FWC 1/2 (label 126)
. PRINTER (labels 303, 350) (IF INSTALLED)
. MCDU 1/2 (labels 303, 270)
. CLOCK (labels 125, 260):
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