FAA PLA Knowledge Test - Private Pilot Airship Practice Questions - FAA Private Pilot Airship Knowledge Test (Test Code PLA) Exam

The altitude at which the ballonets become completely empty and the lifting gas fully expands to fill the entire envelope The maximum altitude at which the envelope gas valves begin to open automatically during descent The pressure altitude at which dynamic lift equals static heaviness during cruise flight The altitude where atmospheric pressure drops to exactly half of sea level pressure