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Decision altitude (DA) is a specified altitude in an instrument approach procedure at which the pilot must decide whether to initiate an immediate missed approach if the pilot does not see the required visual reference, or to continue the approach. Decision altitude is expressed in feet above level.

Decision height (DH) is a specified the in an instrument approach procedure at which the pilot must decide whether to initiate an immediate missed approach if the pilot does not see the required visual reference, or to continue the approach. Decision height is expressed in feet above ground level.

Final approach fix (FAF) defines the of the   segment and the point where final segment descent may .

Flight level means a level of constant atmospheric pressure related to a reference datum of inches of mercury. Each is stated in three digits that represent hundreds of feet. For example, flight level 250 represents a barometric altimeter indication of feet.

Flight visibility means the average forward horizontal distance, from the cockpit of an aircraft in flight, at which prominent unlighted objects may be and by day and prominent lighted objects may be seen and identified by night.

Instrument approach procedure (IAP) is a series of predetermined maneuvers by reference to flight instruments with specified protection from obstacles and assurance of navigation signal reception capability. It begins from the approach , or where applicable, from the beginning of a defined arrival route to a point:

(1) From which a can be completed; or

(2) If a landing is not completed, to a position at which holding or en route obstacle clearance criteria apply.

Minimum descent altitude (MDA) is the %BLANK% altitude specified in an instrument approach procedure, expressed in feet above mean sea level, to which descent is authorized on final approach or during circle-to-land maneuvering until the pilot sees the required visual references for the heliport or runway of intended landing.

Nonprecision approach procedure means a standard instrument approach procedure in which electronic is provided.

Precision approach procedure means a standard instrument approach procedure in which an electronic is provided, such as ILS and PAR.

AGL: level

ALS: system

ASR: surveillance

ATC:

DH:

DME: compatible with TACAN

GS:

HIRL: - light system

ILS:

LDA: -type directional aid

MAA: authorized IFR

MALS: intensity system

MCA: altitude

MDA: altitude

MEA: IFR altitude

MOCA: altitude

MRA: altitude

MSL: level

NDB (ADF): beacon (automatic direction finder)

RAIL: light system

REIL: identification lights

RVR: as measured in the touchdown zone area

VGSI: indicator

VHF:

VOR: very high frequency station

VORTAC: collocated and

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