Final answer:
Entering and exiting a helicopter parked on a hill depends on whether the hill is uphill or downhill.
Step-by-step explanation:
Entering and exiting a helicopter parked on a hill requires careful consideration of the hill's slope. When the helicopter is parked on an upslope, the procedure involves approaching the helicopter from the front and climbing up to the cabin.
This is because the helicopter's rotor blades should always be facing uphill to prevent them from striking the hill. When the helicopter is parked on a downslope, the procedure involves approaching the helicopter from the uphill side and descending into the cabin.
This ensures that the rotor blades are facing downhill and there is no risk of hitting the hill during entry or exit. Once close to the helicopter, wait for the pilot to signal before entering or exiting, ensuring that it is safe to do so.