The rotor brake may remain on for how many minutes when one engine operating and START R.BK switch is activated?

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Multiple Choice

The rotor brake may remain on for how many minutes when one engine operating and START R.BK switch is activated?

Explanation:
Holding the rotor brake during a single-engine operation with the START R.BK switch engaged is allowed for a limited period to safely complete the start sequence without letting the rotor wind up or freewheel. The system is thermally limited, so the manual sets a maximum duration to prevent overheating of the brake components. In this case, that maximum duration is five minutes. So the rotor brake may stay on for up to five minutes under these conditions; exceeding that time would require releasing or resetting per procedure. The other time options are not in line with the specified limit.

Holding the rotor brake during a single-engine operation with the START R.BK switch engaged is allowed for a limited period to safely complete the start sequence without letting the rotor wind up or freewheel. The system is thermally limited, so the manual sets a maximum duration to prevent overheating of the brake components. In this case, that maximum duration is five minutes. So the rotor brake may stay on for up to five minutes under these conditions; exceeding that time would require releasing or resetting per procedure. The other time options are not in line with the specified limit.

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