The crew of the aircraft is obliged to fasten all seat belts and harnesses

1. To order of the aircraft commander
2. Only for landing
3. To take off and landing
4. ✓To take off and landing, and to order of the aircraft commanderCorrect answer

Explanation

According to operational regulations (such as EASA NCO.OP.140), crew members must be secured by safety belts during critical phases of flight, specifically…

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