FAA commercial glider pilot theory foundations key terms

A representation relating airspeed to sink behavior under specified conditions, requiring its actual axes, loading and reference assumptions for interpretation.

The operating point minimizing sink in the specified model, distinguished from the point maximizing horizontal travel per unit height lost.

The operating point maximizing the stated distance-to-height relationship under its assumptions, not a guarantee of range in wind, sink or maneuvering.

Weight per wing area in the specified comparison, affecting the speed and performance relationships rather than automatically granting a ballast permission.

The approved check establishing required connection, security and correct control movement, distinguished from merely observing that a cockpit handle moves.

Correction reducing indications caused solely by speed-height energy exchange, distinct from removing the sailplane's own still-air sink through a netto function.

An estimate of airmass vertical movement using the appropriate aircraft/polar correction, with its sign convention and compensation assumptions kept explicit.

A specified protective link in a launch system, whose strength, placement and acceptability come from applicable rules and aircraft data.

A rising air structure associated with convection, whose usable core, drift and surrounding flow vary with the actual atmosphere and terrain.

Upward airflow associated with wind meeting terrain, requiring assessment of actual wind direction, terrain, turbulence and available landing options.

An organized standing-wave airflow pattern associated with appropriate terrain and atmospheric conditions, potentially accompanied by severe rotor, sink and shear.

The level associated with cloud formation from surface-based convection in the stated model, distinguished from a different parcel lifting process.

A planned remaining height for the stated destination and approach needs, separate from a theoretical range calculation that descends to zero height.

Horizontal travel over the ground per unit vertical height lost in the defined model, affected by wind and vertical air motion.

A field or airfield that remains within a realistic glide model and is assessed for actual surface, obstacle, wind and approach suitability.

Navigation through comparison of visible features with charted references, requiring correct identification rather than confidence in an unverified landmark.

Selecting or interpreting evidence in favor of an existing belief while discounting conflicting information, potentially preserving an unsuitable flying plan.

Commitment to an original course despite changed conditions, especially when completion, passenger or financial pressures make reconsideration difficult.

A defined exception to a certificate requirement under the applicable rule, not a finding of fitness or freedom from relevant medical limitations.

A stated condition used to reassess a plan before margins become inadequate, distinguished from a universal numerical limit invented for every glider.