In Low Cab mode, to what altitude is the cabin set according to the FMS?

• A. The field elevation of the destination
• B. The field elevation at the departure
• C. Sea level
• D. 2,000 feet

Answer: (A)

The idea being tested is how the FMS controls cabin pressure when using the Low Cab mode. In this mode, the system targets the field elevation of the destination as the cabin altitude. That means as you descend toward the destination, the cabin pressure is managed to bring the cabin altitude in line with the airfield’s elevation, giving a smoother, more comfortable transition on arrival and avoiding unnecessary large pressure changes when you reach the airport.

Using the destination field elevation ensures the cabin is already near the local altitude you’ll be operating at, which is more appropriate for most arrivals than aiming for the departure elevation, sea level, or a fixed altitude like 2,000 feet.