FLIGHT INFORMATION PUBLICATION GENERAL PLANNING(21)

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AIRWAY BEACON - Used to mark airway segments in remote mountain areas. The light flashes Morse Code to identify the beacon site.
ALERT AREA - (See Special Use Airspace).
ALERT NOTICE/ALNOT - A request originated by a Flight Service Station (FSS) or an Air Route Traffic Control Center (ARTCC) for an extensive communication search for overdue, unreported, or missing aircraft.
ALPHANUMERIC DISPLAY/DATA BLOCK - Letters and numerals used to show identification, altitude, beacon code and other information concerning a target on a radar display. (See Automated Radar Terminal Systems, NAS Stage A)
ALTERNATE AERODROME (ICAO) - An aerodrome specified in the flight plan to which a flight may proceed when it becomes inadvisable to land at the aerodrome of intended landing.
NOTE - An alternate aerodrome may be the aerodrome of departure.
ALTERNATE AIRFIELD (JCS, NATO) - An airfield specified in the flight plan to which a flight may proceed when a landing at the intended destination becomes inadvisable. An alternate airfield may be the airfield of departure.
ALTERNATE AIRPORT - An airport at which an aircraft may land if a landing at the intended airport becomes inadvisable.
ALTIMETER SETTING - The barometric pressure reading used to adjust a pressure altimeter for variations in existing atmospheric pressure or to the standard altimeter setting (29.92). (Refer to Federal Air Regulations Part 91) (See QFE Setting, QNE Setting, QNH Setting)
ALTITUDE (P/CG) - The height of a level, point or object measured in feet Above Ground Level (AGL) or from Mean Sea Level (MSL). (See Flight Level)
(1)
MSL ALTITUDE - Altitude, expressed in feet measured from Mean Sea Level.

(2)
AGL ALTITUDE - Altitude expressed in feet measured Above Ground Level.

(3)
INDICATED ALTITUDE - The altitude as shown by an altimeter. On a pressure or barometric altimeter it is altitude as shown uncorrected for instrument error and uncompensated for variation from standard atmospheric conditions.

ALTITUDE (JCS, NATO, ICAO) - The vertical distance of a level, a point or an object considered as a point, measured from mean sea level.
ALTITUDE READOUT/AUTOMATIC ALTITUDE REPORT - An aircraft's altitude, transmitted via the Mode C transponder feature, that is visually displayed in 100 foot increments on a radar scope having readout capability. (See Automatic Radar Terminal System, NAS Stage A, Alpha Numeric Display)
ALTITUDE RESERVATION/ALTRV (IFIM) - Airspace utilization under prescribed conditions normally employed for the mass movement of aircraft or other special user requirements which cannot otherwise be accomplished. ALTRVs are approved by the appropriate Federal Aviation Administration facility. (See Air traffic Control System Command Center. Refer to AP/2, Chapter 1, for EUCOM or AP/3, Chapter 1 for PACOM ALTRV Procedures).
(1) ALTRVs are classified as either moving or stationary.
(a)
A moving ALTRV will normally include the enroute and arrival phases of flight up to and including the arrival holding pattern at which Air Traffic Control provides separation between aircraft in accordance with FAA 7110.65.

(b)
A stationary ALTRV will normally define the fixed airspace area to be occupied as well as the specific altitude(s) and time period(s) the area will be in use. (See FAA 7610.4J)

ALTITUDE RESTRICTION - An altitude or altitudes stated in the order flown, which are to be maintained until reaching a specific point or time. Altitude restrictions may be issued by Air Traffic Control due to traffic, terrain or other airspace considerations.
ALTITUDE RESTRICTIONS ARE CANCELLED - Adherence to previously imposed altitude restrictions is no longer required during a climb or descent.
APPROACH CLEARANCE - Authorization by Air Traffic Control for a pilot to conduct an instrument approach. The type of instrument approach for which cleared and other pertinent information is provided in the approach clearance when required. (See Instrument Approach Procedure, Cleared for Approach) (Refer to Federal Air Regulations Part 91)
　
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