When do FADEC channels alternate?

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Multiple Choice

When do FADEC channels alternate?

Explanation:
Redundancy with two FADEC channels is used to protect against failures by having one channel actively control the engine while the other stays in reserve. To keep both channels healthy and to verify they agree, the system switches which channel is active on each engine start. So on one start, one channel handles control; on the next start, the other channel takes over, and the pattern continues. This approach balances wear between the channels and provides an effective check for faults. This switching is tied to the start sequence, not during cruise, idle, or shutdown, which is why every other start is when the alternation occurs.

Redundancy with two FADEC channels is used to protect against failures by having one channel actively control the engine while the other stays in reserve. To keep both channels healthy and to verify they agree, the system switches which channel is active on each engine start. So on one start, one channel handles control; on the next start, the other channel takes over, and the pattern continues. This approach balances wear between the channels and provides an effective check for faults. This switching is tied to the start sequence, not during cruise, idle, or shutdown, which is why every other start is when the alternation occurs.

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