(3) Interface with the FDIU and the DMU The FDIU provides aircraft identification. This parameter is acquired by the CFDIU at each flight phase change and at power-up. The FDIU and the DMU provide fault information (label 350) to the CFDIU (label 270), which in turn transmits it to the ECAM system. These items of information are permanently acquired by the CFDIU. The FDIU or the DMU is declared failed or invalid (= incorrect operation) by the CFDIU when at least one of the labels of the "aircraft identification" parameter is not refreshed or transmitted with incorrect parity, confirmed over 4 seconds (no SSM). In this case, after a flight phase transition (+ confirmation), the CFDIU uses and retransmits in lieu of the incorrect label(s), the last label(s) acquired correctly, i.e. received with the correct state during a flight phase transition. This (these) used and retransmitted label(s) is (are) frozen, even after other flight phase transitions, as long as it (they) remains (remain) incorrect. If moreover a CFDIU power cutoff occurs, the CFDIU uses blank characters for its own reports (e.g. printouts) and retransmits 0s by default, for the incorrect label(s) before cutoff.
NOTE : - During the confirmation time related to the incorrect
____ operation, the CFDIU uses and retransmits the last correct labels acquired.
-When the incorrect operation disappears, the CFDIU resumes use and normal transmission of the parameter at the following acquisition (phase transition).
The FDIU or the DMU is declared invalid (but not failed) by the CFDIU when their fault information (label 350) is transmitted at NCD = 01 or FW = 11 or FT = 10, confirmed over 3 cycles. In this case, after the confirmation time, the CFDIU retransmits at NO = 00 the label 270 with the last correct value acquired on the failed label 350. The label 270 bits corresponding to the failed label 350 are frozen as long as the label is failed. If moreover a CFDIU power cutoff occurs, the CFDIU retransmits 0s by default at NO = 00 for the values corresponding to failed label 350.
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(4) Interface with the FAC1 The FAC1 provides the flight number and the departure and arrival airports. The CFDIU acquires the flight number at NULL/DC2 transition at each flight phase change, at touchdown (nose landing gear) and power-up. The CFDIU acquires the departure and arrival airports at NULL/DC2 transition, every 30 seconds on ground, at each flight phase change in flight, at touchdown and power-up. The FAC1 is declared failed by the CFDIU when at least one of the labels of the "flight number" or "city pair" parameters is not refreshed or transmitted with incorrect parity, confirmed over 4 seconds. In this case, after a flight phase transition (+ confirmation), the CFDIU uses and retransmits at NCD = 01, in lieu of the failed label(s), the last label(s) acquired correctly, i.e. received with the correct state during a flight phase transition. This (these) used label(s) which is (are) retransmitted at NCD = 01, is (are) frozen, even after other flight phase transitions, as long as it (they) remains (remain) incorrect. If moreover a CFDIU power cutoff occurs, the CFDIU uses dashes for its own reports (e.g. printout) and retransmits 0s by default at NCD = 01, for the incorrect label(s) before cutoff. The FAC1 is declared invalid (but not failed) by the CFDIU when at least one of the labels of the "flight number" or "city pair" parameters is transmitted at NCD = 01, confirmed over 3 cycles. In this case, the CFDIU performs a processing which is identical to that of the previous case.
NOTE : - During the confirmation times related to the invalid or
____ failed state, the CFDIU uses and retransmits at NO = 11 the last correct labels acquired.
-when the invalid or failed state disappears, the CFDIU resumes use and normal transmission of the parameters at the following acquisi- tion (phase transition).
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(5) Interface with the DMC1 The DMC1 provides the engine serial number. This parameter is acquired 45 s after CFDIU power-up and on flight phase 1/2 transition. The DMC1 is declared failed by the CFDIU when at least one of the labels of the "engine serial number" parameter is not refreshed or transmitted with incorrect parity, confirmed over 18 seconds. In this case :
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after flight phase 1/2 transition (+ confirmation), the CFDIU retransmits at NO = 00 the last labels acquired correctly, i.e. received with the correct state during CFDIU power-up or during phase 1/2 transition.
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