The EEC alternates between control channels with each engine start attempt.

The EEC alternates between control channels with each engine start attempt.

• A. With each engine start attempt.
• B. Only on the first start attempt.
• C. On every shutdown.
• D. Never alternates between channels.

Answer: (A)

Redundant control channels are used to keep the engine safe and reliable. The EEC has two independent control channels, and to ensure both are healthy and not overused, it switches which channel is actively controlling the engine on each start attempt. This deliberate alternation means the channel that was in control on one start will be swapped for the other on the next start attempt, so both channels are exercised and cross-checked over time. If a fault shows up on a channel during its active turn, the system can flag it and rely on the other channel, preserving safe operation. This behavior is not tied to the very first start, nor to shutdown events, and it certainly isn’t something that never happens. The best-fitting description is that the EEC alternates control channels with each engine start attempt.

Redundant control channels are used to keep the engine safe and reliable. The EEC has two independent control channels, and to ensure both are healthy and not overused, it switches which channel is actively controlling the engine on each start attempt. This deliberate alternation means the channel that was in control on one start will be swapped for the other on the next start attempt, so both channels are exercised and cross-checked over time. If a fault shows up on a channel during its active turn, the system can flag it and rely on the other channel, preserving safe operation.

This behavior is not tied to the very first start, nor to shutdown events, and it certainly isn’t something that never happens. The best-fitting description is that the EEC alternates control channels with each engine start attempt.