Omnidirectional range or omnirange. A radio navigation system that gives bearings in all directions from a transmitter.

P

Pilotage. Navigation by visual reference to check points and by comparing landmarks with symbols on a chart.

Pilot chute. A small parachute which pulls out the main parachute from a pack.

Pitch. The up-and-down, or vertical, movement of an aircraft about its lateral axis.

Pilot-static tubes. A device, consisting of a pilot tube and a static tube, that measures impact and static pressures. The pressure difference registers airspeed in an air-speed indicator. The static pressure may operate an altimeter or similar instruments.

Pressurize. To maintain normal pressure in a cabin at high altitudes.