In a dual FMS, a failure of one computer will result in
- COMPLETELY blank display on one CDU
- down-grade of the landing category
- no effect on the CDU
Explanation
A dual FMS provides redundancy by running two independent flight-management computers. If one computer fails the remaining computer continues to drive both control display units, so the crew see no loss on the CDU and the system simply reverts from independent to single-source operation.
sam612 asking:
In other QA it indicated that 'COMPLETELY blank display on one CDU' was the correct answer ??
Community Comments (7)
T
trap2307 Posts: 43 01.02.2013 / 20:54
In dual FMS we have two computers. When first computer fails, second computer will replace it. So "no effect on the CDU" is correct answer.
D
dimky Posts: 514 01.02.2013 / 20:57
sam, could you tell please give a link to QA where "COMPLETELY blank display on one CDU" was the correct answer?
S
sasna Posts: 20 03.09.2013 / 00:42
I agree with sam yes you have complete blank display as answer in another que- failure of FMS in dual system
C
Crystal Posts: 5 27.11.2017 / 13:52
I agree with trap2307. If one computer fails, the other one takes over so there will be no effect on the CDU.
The other question is asking about failure of the FMS itself where the CDU will go blank
The other question is asking about failure of the FMS itself where the CDU will go blank
J
Jordi Posts: 198 19.11.2022 / 16:56
trap is correct
J
Jordi Posts: 198 19.11.2022 / 16:56
trap is correct
J
Jordi Posts: 198 28.11.2022 / 18:46
The word COMPLETEY makes a) incorrect. The word CDU is displayed on the CDU and it can be selected to a different source.
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