-
at the maintenance test: 60 s.
During a system test, all the detectors are isolated from the FDU. The detector conditions are simulated by the BITE to test any failure in the FDU and its connections.
The BITE can tell if the failure is in the detector or the circuitry.
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(2)
Test combinations used by the BITE are as follows:
-
Loop A NORMAL and Loop B NORMAL
-
Loop A FIRE and Loop B FIRE
-
Loop A INTEGRITY FAULT and Loop B FIRE
-
Loop A NORMAL and Loop B NORMAL
-
Loop A FIRE and Loop B INTEGRITY FAULT
-
Loop A FIRE for less than 17 seconds while Loop B is NORMAL
-
Loop A FIRE for more than 17 seconds while Loop B is NORMAL
-
Loop B FIRE for less than 17 seconds while Loop A is NORMAL
-
Loop B FIRE for more than 17 seconds while Loop A is NORMAL
-
Loop A NORMAL and Loop B NORMAL
-
Loop A CONTAMINATION FAULT and then Loop B CONTAMINATION FAULT within 5 seconds
(3)
The list of maintenance messages sent to the CFDIU by the FDU is as follows:
-------------------------------------------------------------------------------MAINTENANCE MESSAGES CLASS INT/EXT ATA REF -------------------------------------------------------------------------------
CHECK ENG (*) FIRE LOOP A 1 INT 26-12-15 CHECK ENG (*) FIRE LOOP B 1 INT 26-12-15 CHECK FDU ENG (*) SUPPLY 1 INT 26-12-00 CHECK FDU ENG (*) LOOP A WARN CKT 3 INT 26-12-00 CHECK FDU ENG (*) LOOP B WARN CKT 3 INT 26-12-00 CHECK FDU ENG (*) FIRE A WARN CKT 3 INT 26-12-00 CHECK FDU ENG (*) FIRE B WARN CKT 3 INT 26-12-00 CHECK FDU ENG (*) LGCIU INTFC 3 EXT 26-12-00 CHECK FDU ENG (*) PIN PROG 3 INT 26-12-00 CHECK FDU PIN PROG 3 INT 26-10-00 FDU ENG (*) 3 INT 26-12-34 -------------------------------------------------------------------------------
* = 1 (2) for engine 1 (2)
NOTE : When the failure occurs on the ground, GND precedes the
____
maintenance message.
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B. Built-In Test Equipment (BITE)
(1) Description
The function of the BITE is to:
-monitor the condition of the FDU and the related inputs,
-analyze and confirm the faults and,
-store them in the Non-Volatile Memory (NVM).
The FDU is a type 2 system. The FDU BITE functions are as follows:
-acquisition of discrete input signals,
-link with the CFDS (thru an ARINC 429 bus),
-memorization of failure in a NVM,
-tests.
The BITE test of the FDU is performed at power up or when the maintenance test discrete signal is sent from the MCDU via the CFDIU. In the two cases, the BITE test is performed if and only if the aircraft is on the ground.
Upon selection by the operator from the MCDU, the CFDIU displays the "FIRE PROT: FDU 1 (2)" menu and presents data on the MCDU.
For the system, the basic functions are:
-LAST LEG/GND REPORT,
-LRU IDENTIFICATION,
-CLASS 3 FAULTS,
-TEST.
BITE Test duration:
-
at power up: 75 s,
-
at the maintenance test: 90 s.
During a system test, all the detectors are isolated from the FDU. The detector conditions are simulated by the BITE to test any failure in the FDU and its connections.
The BITE can tell if the failure is in the detector or the circuitry.
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(2) Test combinations used by the BITE are as follows:
(a)
Check:
-loops A and B for normal operating condition, 中國航空網 www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：A320飛機維護手冊 AMM FIRE PROTECTION 防火1(26)
