AIP - Airport Improvement Program - For more information contact the appropriate FAA Airport office or reference the AIP Website.


AGL - Above Ground Level


ALP - (Airport Layout Plan) - The plan of an airport showing the layout of existing and proposed airport facilities. ALPs are used by many organizations for planning, verifying airport data, obstruction evaluation, project coordination, and other studies. They also show whether the airport meets the standards applicable to new instrument approach procedure approval.

Certified Altimeter - Altimeter that meets flight standards certification criteria for use as a altimeter setting at the airport.


Convertible Special - A special instrument flight procedure developed for a designated operator(s) according to 14 CFR 97 standards which is submitted to the FAA for conversion into a public procedure.


DA - Decision altitude: Missed approach point on a precision approach.


DH - Decision height: Missed approach point on an ILS approach.


DOT - Department Of Transportation


FAA - Federal Aviation Administration


Flight Inspection - Flight Check of Instrument Approach


FICO - Flight Inspection Central Operations


FSDO - Flight Standards District Office


GS - Glide Slope


GPS - Global Positioning System


HIRL - High Intensity Runway Lights


IFP - Instrument Flight Procedure


IAWP - In accordance with published


IFR - Instrument Flight Rules


ILS - Instrument Landing System


LAAS - Local Area Augmentation System


LIRL - Low Intensity Runway Lights


LOC - Localizer


MDA - Minimum Descent Altitude


MIRL - Medium Intensity Runway Lights


NACO - National Aeronautical Charting Office


NAS - National Airspace System


NAVAIDS - Navigational Aids


NGS - National Geodetic Survey NGS Website


NDB - Non-Directional Beacon


NFDC - National Flight Data Center


Non-Fed. Facility - A non-federally owned navigation facility that meets the requirements of Title 14 U.S.C. Part 171


Obligated Airport - Any public airport having agreements with the Federal Aviation Administration. These obligations are in the sponsor's assurances in grant agreements under the Airport Improvement Program (AIP) and in real property transfers under the Surplus Property Act and other legislation. Among the obligations is the requirement to maintain an current Airport Layout Plan on file with the FAA.


OM - Outer marker


PFC - Passenger Facility Charge


Reimbursable Agreement - Is a contract that ensures the cost recovery of goods or services provided by the FAA. Contact the appropriate FPO for further details.


RAPT - Regional Airspace Procedures Team - is an integrated team comprised of members from Air Traffic, Aviation System Standards (AVN), Flight Standards, and Airports. The RAPT evaluates customer requests that may have an impact on airspace, airports, or flight procedures.


TERPS - U.S. Standard for Terminal Instrument Procedures, FAA Order 8260.3B. The criteria used for development of most instrument flight procedures in the U.S.A.


RNAV - Area navigation


VFR - Visual Flight Rules


VGSI - Visual Glide Slope Indicator


VOR - Very high frequency Omni directional Range


WAAS - Wide Area Augmentation System