(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)
APPROACH CONTROL FACILITY - A terminal Air Traffic Control facility that provides approach control service in a terminal area. (See Approach Control Service, Radar Approach Control Facility).
APPROACH CONTROL SERVICE (P/CG) - Air Traffic Control service provided by an Approach Control facility for arriving and departing VFR/IFR aircraft and, on occasion, enroute aircraft. At some airports not served by an Approach Control facility, the Air Route Traffic Control Center provides limited Approach Control service.
APPROACH CONTROL SERVICE (ICAO) - Air Traffic Control service for arriving or departing controlled flights.
APPROACH GATE - An imaginary point used within Air Traffic Control as a basis for vectoring aircraft to the final approach course. The gate will be established along the final approach course 1 mile from the Outer Marker (or the fix used in lieu of the Outer Marker) on the side away from the airport for precision approaches and 1 mile from the Final Approach Fix on the side away from the airport for nonprecision approaches. In either case when measured along the final approach course, the gate will be no closer than 5 miles from the landing threshold.
APPROACH LIGHT SYSTEM - (See Airport Lighting)
APPROACH SEQUENCE (P/CG) - The order in which aircraft are positioned while on approach or awaiting approach clearance. (See Landing Sequence)
APPROACH SEQUENCE (JCS, NATO) - The order in which aircraft are to approach a given point.
APPROACH SEQUENCE (ICAO) - The order in which two or more aircraft are cleared for an approach.
APPROACH SPEED - The recommended speed contained in aircraft operating manuals used by pilots when making an approach to landing. This speed will vary for different segments of an approach as well as for aircraft weight and configuration.
APPROPRIATE TERRAIN/OBSTACLE CLEARANCE MINIMUM ALTITUDE - Any of the following: Minimum IFR Altitude (MIA), Minimum Enroute Altitude (MEA), Minimum Obstruction Clearance Altitude (MOCA), or Minimum Vectoring Altitude (MVA).