{"id":224,"date":"2025-09-20T12:16:50","date_gmt":"2025-09-20T18:16:50","guid":{"rendered":"https:\/\/eaa1373.org\/v3\/?page_id=224"},"modified":"2025-09-20T13:04:05","modified_gmt":"2025-09-20T19:04:05","slug":"aviation-glossary","status":"publish","type":"page","link":"https:\/\/eaa1373.org\/v3\/aviation-glossary\/","title":{"rendered":"Aviation Glossary"},"content":{"rendered":"
\n\t\t\t
\n\t\t\t\t<\/colgroup>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\n

Acronym<\/p>\n<\/div><\/th>\n\n

\n

Description<\/p>\n<\/div><\/th>\n<\/tr>

\n

A&P<\/p>\n<\/div><\/td>\n\n

\n

Airframe and Power plant \u2014 Generally refers to an aircraft mechanic who is certified to work on both the power plant (engine) and the airframe for aircraft. (Ref.: FAR \u00a765.85<\/a>, \u00a765.87<\/a>)<\/p>\n<\/div><\/td>\n<\/tr>

\n

AC<\/p>\n<\/div><\/td>\n\n

\n

Advisory Circular \u2014 The FAA issues advisory circulars to inform the aviation public of non-regulatory material. Unless incorporated into a regulation by reference, the contents of an advisory circular are not binding on the public.<\/p>\n<\/div><\/td>\n<\/tr>

\n

AD<\/p>\n<\/div><\/td>\n\n

\n

Airworthiness Directive \u2014 The FAA issues airworthiness directives in response to deficiencies or unsafe conditions found in aircraft, engines, propellers, or other aircraft parts. For type-certified aircraft, ADs must be followed to remain in compliance with the FAA. (Ref.: FAR \u00a739.7<\/a>)<\/p>\n<\/div><\/td>\n<\/tr>

\n

ADAHRS<\/p>\n<\/div><\/td>\n\n

\n

Air Data, Attitude and Heading Reference System \u2014 Similar to AHRS (see below) but providing additional information, such as airspeed and OAT.<\/p>\n<\/div><\/td>\n<\/tr>

\n

ADS-B<\/p>\n<\/div><\/td>\n\n

\n

Automatic Dependent Surveillance – Broadcast \u2014 A surveillance technology in which an aircraft determines its position via satellite navigation and periodically broadcasts it, enabling it to be tracked. (Ref.: Wikipedia<\/a>)<\/p>\n<\/div><\/td>\n<\/tr>

\n

ADS-R<\/p>\n<\/div><\/td>\n\n

\n

Automatic Dependent Surveillance – Rebroadcast \u2014 A client-based service that relays ADS-B information transmitted by an aircraft broadcasting on one link (1090MHz or 978MHz) to aircraft equipped with ADS-B In on the other link.<\/p>\n<\/div><\/td>\n<\/tr>

\n

AHRS<\/p>\n<\/div><\/td>\n\n

\n

Attitude and Heading Reference System \u2014 A system of electronic sensors on three axes that provide attitude (roll, pitch, yaw) and heading (directional) information. Often integrated with an EFIS in either panel mounted (permanent) or portable configurations.<\/p>\n<\/div><\/td>\n<\/tr>

\n

AIM<\/p>\n<\/div><\/td>\n\n

\n

Aeronautical Information Manual \u2014 Official guide to basic flight information. (Ref. FAA PDF<\/a>)<\/p>\n<\/div><\/td>\n<\/tr>

\n

AMT<\/p>\n<\/div><\/td>\n\n

\n

Aviation Maintenance Technician<\/p>\n<\/div><\/td>\n<\/tr>

\n

AOPA<\/p>\n<\/div><\/td>\n\n

\n

Aircraft Owners and Pilots Association<\/a><\/p>\n<\/div><\/td>\n<\/tr>

\n

BFR<\/p>\n<\/div><\/td>\n\n

\n

Biennial Flight Review \u2013 All certificated pilots must complete a Flight Review (formerly known as a biennial flight review) every 24 months. (Ref.: FAR \u00a761.56<\/a>)<\/p>\n<\/div><\/td>\n<\/tr>

\n

CFI or CFII<\/p>\n<\/div><\/td>\n\n

\n

Certified Flight Instructor [Instrument]\n<\/div><\/td>\n<\/tr>

\n

CFR<\/p>\n<\/div><\/td>\n\n

\n

Code of Federal Regulations. (Also e-CFR for \u201celectronic\u201d CFR.) (e-CFT link<\/a>)<\/p>\n<\/div><\/td>\n<\/tr>

\n

CHT<\/p>\n<\/div><\/td>\n\n

\n

Cylinder Head Temperature<\/p>\n<\/div><\/td>\n<\/tr>

\n

DA<\/p>\n<\/div><\/td>\n\n

\n

Density Altitude \u2014 Pressure altitude corrected for nonstandard temperature. As temperature and altitude increase, air density decreases. In a sense, DA is the altitude at which the airplane “feels” its flying. (Ref.: AOPA<\/a>)<\/p>\n<\/div><\/td>\n<\/tr>

\n

DAR<\/p>\n<\/div><\/td>\n\n

\n

Designated Airworthiness Representative \u2014 An individual designated by the FAA to act on its behalf in the certification of type-certificated and amateur-built aircraft for the issuance of airworthiness certificates, special flight permits, import aircraft, export certificates for products and articles, conformity inspections and field approvals for repair and alterations. (Ref. Wikipedia<\/a>)<\/p>\n<\/div><\/td>\n<\/tr>

\n

DPE<\/p>\n<\/div><\/td>\n\n

\n

Designated Pilot Examiner \u2014 A person designated by the FAA to conduct the practical test (checkride).<\/p>\n<\/div><\/td>\n<\/tr>

\n

EAA<\/p>\n<\/div><\/td>\n\n

\n

Experimental Aircraft Association<\/a><\/p>\n<\/div><\/td>\n<\/tr>

\n

EAB<\/p>\n<\/div><\/td>\n\n

\n

Experimental Amateur-Built \u2014 See FAQ<\/a>.<\/p>\n<\/div><\/td>\n<\/tr>

\n

EFB<\/p>\n<\/div><\/td>\n\n

\n

Electronic Flight Bag \u2014 Instrument (such as a tablet or smartphone) that manages pilot information electronically. This could include charts, location, flight plans, weather reports, aircraft documents, and other information. Examples include ForeFlight and Garmin Pilot running on an Apple iPad.<\/p>\n<\/div><\/td>\n<\/tr>

\n

EFIS<\/p>\n<\/div><\/td>\n\n

\n

Electronic Flight Information System \u2014 Electronic instrument that displays attitude, airspeed, altitude, turn rate, time, or other information. Typically part of a “glass” panel or cockpit.<\/p>\n<\/div><\/td>\n<\/tr>

\n

EGT<\/p>\n<\/div><\/td>\n\n

\n

Exhaust Gas Temperature<\/p>\n<\/div><\/td>\n<\/tr>

\n

ELSA or E-LSA<\/p>\n<\/div><\/td>\n\n

\n

Experimental Light Sport Aircraft \u2014 A kit version of a S-LSA.<\/p>\n<\/div><\/td>\n<\/tr>

\n

EIS or EMS<\/p>\n<\/div><\/td>\n\n

\n

Engine Information or Monitoring System \u2014 Electronic instrument that monitors and displays engine information such as: fuel level and burn rate, RPM, manifold pressure, cylinder hear temps, oil temp and pressure, amperage, voltage, exhaust gas temps, and other information.<\/p>\n<\/div><\/td>\n<\/tr>

\n

FAR<\/p>\n<\/div><\/td>\n\n

\n

Federal Aviation Regulations. See also CFR above. (e-CFT link to FAR<\/a>)<\/p>\n<\/div><\/td>\n<\/tr>

\n

FIS-B<\/p>\n<\/div><\/td>\n\n

\n

Flight Information Service – Broadcast \u2014 A component of ADS-B technology that provides free graphical National Weather Service products, temporary flight restrictions (TFRs), and special use airspace information. (Ref.: SkyRadar.net<\/a>, FAA<\/a>)<\/p>\n<\/div><\/td>\n<\/tr>

\n

FSDO<\/p>\n<\/div><\/td>\n\n

\n

Flight Standards District Office \u2014 FSDO is a locally affiliated field office of the FAA. Delta and Montrose counties in Colorado are serviced by the Utah FSDO in Salt Lake City. (Ref. FAA website<\/a>)<\/p>\n<\/div><\/td>\n<\/tr>

\n

GPS<\/p>\n<\/div><\/td>\n\n

\n

Global Positioning System \u2014 Often GPS refers to a device capable of receiving information from a global navigation satellite system.<\/p>\n<\/div><\/td>\n<\/tr>

\n

GUMPS<\/p>\n<\/div><\/td>\n\n

\n


Gas, Undercarriage, Mixture, Prop, Seatbelts and\/or Switches \u2014 Widely used pre-landing mental checklist to remind the pilot to check: fuel (tank, pressure, pump), landing gear (down), mixture (rich), propeller (high RPM), seatbelts (fastened) and switches (lights, pitot heat, etc.).<\/p>\n<\/div><\/td>\n<\/tr>

\n

IA<\/p>\n<\/div><\/td>\n\n

\n

Inspection Authority \u2014 Generally refers to an A&P mechanic who is certified to perform inspections. Sometimes called an A&I, meaning “A&P with IA” (Ref.: FAR \u00a765.91<\/a>)<\/p>\n<\/div><\/td>\n<\/tr>

\n

ICAO<\/p>\n<\/div><\/td>\n\n

\n

International Civil Aviation Organization \u2014 A UN specialized agency established to manage the administration and governance of international air navigation.<\/p>\n<\/div><\/td>\n<\/tr>

\n

MEI<\/p>\n<\/div><\/td>\n\n

\n

Multi-Engine Instructor<\/p>\n<\/div><\/td>\n<\/tr>

\n

LODA<\/p>\n<\/div><\/td>\n\n

\n

Letter Of Deviation Authority \u2014 A formal authorization issued by the FAA Flight Standards office authorizing a deviation from specified section(s) of FAR.<\/p>\n<\/div><\/td>\n<\/tr>

\n

LOP<\/p>\n<\/div><\/td>\n\n

\n

Lean Of Peak \u2014 Leaning the fuel\/air mixture to peak EGT, then continuing<\/em> the leaning process to a certain temperature lean of peak.<\/p>\n<\/div><\/td>\n<\/tr>

\n

LSA<\/p>\n<\/div><\/td>\n\n

\n

Light-Sport Aircraft \u2014 See FAQ: MOSAIC.<\/p>\n<\/div><\/td>\n<\/tr>

\n

LSRI<\/p>\n<\/div><\/td>\n\n

\n

Light-Sport Repairman with Inspection rating \u2014 LSA-RI may perform a conditioon inspection on light-sport aircraft that he\/she owns. (Ref.: FAR \u00a7 65.107<\/a>)<\/p>\n<\/div><\/td>\n<\/tr>

\n

LSRM<\/p>\n<\/div><\/td>\n\n

\n

Light-Sport Repairman with Maintenance rating \u2014 LSA-RM may perform maintenance, repairs, alterations, inspections and return to service any light-sport aircraft. (Ref.: FAR \u00a7 65.107<\/a>)<\/p>\n<\/div><\/td>\n<\/tr>

\n

OAT<\/p>\n<\/div><\/td>\n\n

\n

Outside Air Temperature<\/p>\n<\/div><\/td>\n<\/tr>

\n

OL<\/p>\n<\/div><\/td>\n\n

\n

Operating Limitations<\/p>\n<\/div><\/td>\n<\/tr>

\n

PA<\/p>\n<\/div><\/td>\n\n

\n

Pressure Altitude \u2014 Used in aircraft performance calculations. To find pressure altitude, set your altimeter to 29.92 (standard pressure).<\/p>\n<\/div><\/td>\n<\/tr>

\n

POH<\/p>\n<\/div><\/td>\n\n

\n

Pilot\u2019s Operating Handbook \u2014 This is essentially the \u201cowner\u2019s manual\u201d for the airplane.<\/p>\n<\/div><\/td>\n<\/tr>

\n

PPL<\/p>\n<\/div><\/td>\n\n

\n

Private Pilot License \u2014 There is no such distinction in the FAR. Informally, this term is synonymous with \u201cprivate pilot certificate\u201d. (Ref.: FAR \u00a761.113<\/a>, Wikipedia<\/a>)<\/p>\n<\/div><\/td>\n<\/tr>

\n

ROP<\/p>\n<\/div><\/td>\n\n

\n

Rich Of Peak \u2014 Leaning the fuel\/air mixture to peak EGT, then enriching<\/em> the mixture to a certain temperature rich of peak.<\/p>\n<\/div><\/td>\n<\/tr>

\n

SLSA or S-LSA<\/p>\n<\/div><\/td>\n\n

\n

Special Light Sport Aircraft \u2014 Factory-built aircraft constructed to an industry consensus standard and sold with a special airworthiness certification. See\u00a0FAQ<\/a>.<\/p>\n<\/div><\/td>\n<\/tr>

\n

STOL<\/p>\n<\/div><\/td>\n\n

\n

Short TakeOff and Landing<\/p>\n<\/div><\/td>\n<\/tr>

\n

TCAS<\/p>\n<\/div><\/td>\n\n

\n

Traffic Collision Avoidance System \u2014 An aircraft collision avoidance system designed to reduce the incidence of mid-air collisions between aircraft. (Ref.: Wikipedia<\/a>)<\/p>\n<\/div><\/td>\n<\/tr>

\n

TIS-B<\/p>\n<\/div><\/td>\n\n

\n

Traffic Information Service – Broadcast \u2014 A component of ADS-B technology that provides free traffic reporting services to aircraft equipped with ADS-B receivers. TIS-B allows non-ADS-B transponder equipped aircraft that are tracked\u00a0by radar<\/em>\u00a0to have their location and track information broadcast to ADS-B equipped aircraft. (Ref.:\u00a0AOPA article<\/a>)<\/p>\n<\/div><\/td>\n<\/tr>

\n

TSO<\/p>\n<\/div><\/td>\n\n

\n

Technical Standard Order \u2014 A minimum performance standard established by the FAA for specified materials, parts, and appliances used on civil aircraft.<\/p>\n<\/div><\/td>\n<\/tr>

\n

WAAS<\/p>\n<\/div><\/td>\n\n

\n

Wide Area Augmentation System \u2014 An air navigation aid developed by the FAA to augment GPS. WAAS is intended to enable aircraft to rely on GPS for all phases of flight, including precision approaches. (Ref.: Wikipedia<\/a>)<\/p>\n<\/div><\/td>\n<\/tr>

\n

<\/p>\n<\/div><\/td>\n\n

\n

<\/p>\n<\/div><\/td>\n<\/tr><\/tbody><\/table>\n\t\t\t<\/div>\n\t\t<\/div>\n\n\n

For more definitions, see Part 1<\/a> of the Federal Aviation Regulations, including \u00a71.1 General definitions and \u00a71.2 Abbreviations and symbols.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

For more definitions, see Part 1 of the Federal Aviation Regulations, including \u00a71.1 General definitions and \u00a71.2 Abbreviations and symbols.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-224","page","type-page","status-publish","hentry"],"featured_image_src":null,"_links":{"self":[{"href":"https:\/\/eaa1373.org\/v3\/wp-json\/wp\/v2\/pages\/224","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/eaa1373.org\/v3\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/eaa1373.org\/v3\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/eaa1373.org\/v3\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/eaa1373.org\/v3\/wp-json\/wp\/v2\/comments?post=224"}],"version-history":[{"count":13,"href":"https:\/\/eaa1373.org\/v3\/wp-json\/wp\/v2\/pages\/224\/revisions"}],"predecessor-version":[{"id":246,"href":"https:\/\/eaa1373.org\/v3\/wp-json\/wp\/v2\/pages\/224\/revisions\/246"}],"wp:attachment":[{"href":"https:\/\/eaa1373.org\/v3\/wp-json\/wp\/v2\/media?parent=224"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}