Fitting Aviation Learning Center Online Nexus

The ratio of compressor discharge pressure to compressor inlet pressure.

In gas turbine engines, a condition in an axial-flow compressor in which one or more stages of rotor blades fail to pass air smoothly to the succeeding stages. A stall condition is caused by a pressure ratio that is incompatible with the engine rpm. Compressor stall will be indicated by a rise in exhaust temperature or rpm fluctuation, and if allowed to continue, may result in flameout and physical damage to the engine.

A point used to define a navigation track for an airborne computer system such as GPS or FMS.

Dashed-line circles depicted in the plan view of IAP charts, outside of the reference circle, that show en route and feeder facilities.

A change of state of water from a gas (water vapor) to a liquid.

Small particles of solid matter in the air on which water vapor condenses.

A cone-shaped volume of airspace directly above a VOR station where no signal is received, causing the CDI to fluctuate.

This is a general term, which normally refers to the position of the landing gear and flaps.

A controllable-pitch propeller whose pitch is automatically varied in flight by a governor to maintain a constant rpm in spite of varying air loads.

System that supplies a constant supply of pure oxygen to a rebreather bag that dilutes the pure oxygen with exhaled gases and thus supplies a healthy mix of oxygen and ambient air to the mask. Primarily used in passenger cabins of commercial airliners.