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5/19/22 

Pilot/Controller Glossary 

d. 

Small

 Aircraft of 41,000 pounds or less 

maximum certificated takeoff weight. 

(Refer to AIM.) 

AIRCRAFT CONFLICT

 Predicted conflict, within 

EDST of two aircraft, or between aircraft and 
airspace. A Red alert is used for conflicts when the 
predicted minimum separation is 5 nautical miles or 
less. A Yellow alert is used when the predicted 
minimum separation is between 5 and approximately 
12 nautical miles. A Blue alert is used for conflicts 
between an aircraft and predefined airspace. 

(See 

EN ROUTE DECISION SUPPORT 

TOOL

.) 

AIRCRAFT LIST (ACL)

 A view available with 

EDST that lists aircraft currently in or predicted to be 
in a particular sector’s airspace. The view contains 
textual flight data information in line format and may 
be sorted into various orders based on the specific 
needs of the sector team. 

(See 

EN ROUTE DECISION  SUPPORT 

TOOL

.) 

AIRCRAFT SURGE LAUNCH AND 
RECOVERY

 Procedures used at USAF bases to 

provide increased launch and recovery rates in 
instrument flight rules conditions. ASLAR is based 
on: 

a. 

Reduced separation between aircraft which is 

based on time or distance. Standard arrival separation 
applies between participants including multiple 
flights until the DRAG point. The DRAG point is a 
published location on an ASLAR approach where 
aircraft landing second in a formation slows to a 
predetermined airspeed. The DRAG point is the 
reference point at which MARSA applies as 
expanding elements effect separation within a flight 
or between subsequent participating flights. 

b. 

ASLAR procedures shall be covered in a Letter 

of Agreement between the responsible USAF 
military ATC facility and the concerned Federal 
Aviation Administration facility. Initial Approach 
Fix spacing requirements are normally addressed as 
a minimum. 

AIRCRAFT HAZARD AREA (AHA)

 Used by 

ATC to segregate air traffic from a launch vehicle, 
reentry vehicle, amateur rocket, jettisoned stages, 
hardware, or falling debris generated by failures 
associated with any of these activities. An AHA is 
designated via NOTAM as either a TFR or stationary 

ALTRV. Unless otherwise specified, the vertical 
limits of an AHA are from the surface to unlimited. 

(See CONTINGENCY HAZARD AREA.) 
(See REFINED HAZARD AREA.) 
(See TRANSITIONAL HAZARD AREA.) 

AIRCRAFT WAKE TURBULENCE CATE-
GORIES

  For the purpose of Wake Turbulence 

Recategorization (RECAT) Separation Minima, ATC 
groups aircraft into categories ranging from Category 
A through Category I, dependent upon the version of 
RECAT that is applied. Specific category assign-
ments vary and are listed in the RECAT Orders. 

AIRMEN’S METEOROLOGICAL INFORMA-
TION (AIRMET)

  In-flight weather advisories 

issued only to amend the Aviation Surface Forecast, 
Aviation Cloud Forecast, or area forecast concerning 
weather phenomena which are of operational interest 
to all aircraft and potentially hazardous to aircraft 
having limited capability because of lack of 
equipment, instrumentation, or pilot qualifications. 
AIRMETs concern weather of less severity than that 
covered by SIGMETs or Convective SIGMETs. 
AIRMETs cover moderate icing, moderate turbu-
lence, sustained winds of 30 knots or more at the 
surface, widespread areas of ceilings less than 1,000 
feet and/or visibility less than 3 miles, and extensive 
mountain obscurement. 

(See CONVECTIVE SIGMET.) 
(See CWA.) 
(See SAW.) 
(See SIGMET.) 
(Refer to AIM.) 

AIRPORT

 An area on land or water that is used or 

intended to be used for the landing and takeoff of 
aircraft and includes its buildings and facilities, if 
any. 

AIRPORT ADVISORY AREA

 The area within ten 

miles of an airport without a control tower or where 
the tower is not in operation, and on which a Flight 
Service Station is located. 

(See LOCAL AIRPORT ADVISORY.) 
(Refer to AIM.) 

AIRPORT ARRIVAL RATE (AAR)

 A dynamic 

input parameter specifying the number of arriving 
aircraft which an airport or airspace can accept from 
the ARTCC per hour. The AAR is used to calculate 
the desired interval between successive arrival 
aircraft. 

PCG A