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Ace Your 107

Part 107 Glossary

32 terms a Part 107 candidate runs into while studying — each one cited to an FAA source document and linked to where it's taught in depth.

ACS
Airman Certification Standards. The FAA document (FAA-S-ACS-10B) listing every knowledge standard the Remote Pilot knowledge test is built from — 131 codes across five areas.
Source: uas_acs.pdf, p. 1. What's on the test →
ADS-B
Automatic Dependent Surveillance–Broadcast. A satellite-based surveillance technology, deployed throughout the National Airspace System, that gives aircraft faster and more accurate position data than ground radar alone.
Source: faa-h-8083-25c.pdf, Ch. 14, p. 14-26. Operations guide →
AGL
Above Ground Level. Altitude measured from the ground directly below the aircraft, not from sea level — the 400 ft. operating ceiling under Part 107 (§ 107.51) is an AGL limit.
Source: AC_107-2A.pdf, § 5.12, p. 5-11. Regulations guide →
AKTR
Airman Knowledge Test Report. The report issued immediately after the knowledge test, showing your score and — if you failed — the specific ACS codes you were weak on.
Source: uas_acs.pdf, Appendix 3, p. A-5. Passing score & retakes →
ATIS
Automatic Terminal Information Service. A continuous recorded broadcast of non-control airport information — weather, runway in use, active NOTAMs — at towered airports.
Source: faa-h-8083-25c.pdf, Glossary, p. 481. Operations guide →
AWOS
Automated Weather Observing System. An automated weather-reporting system made up of sensors, a processor, and a synthesized-voice broadcast.
Source: faa-h-8083-25c.pdf, Glossary, p. 481. Weather guide →
Certificate of Waiver (CoW)
An FAA authorization to deviate from specific Part 107 provisions — such as visual line of sight or daylight operation — when the applicant shows the operation can still be conducted safely.
Source: AC_107-2A.pdf, § 5.20, p. 5-15. Regulations guide →
Civil twilight
The period from sunset to 30 minutes after sunset, and from 30 minutes before sunrise to sunrise, in the continental U.S. It bookends "night" under § 107.29 and triggers the anti-collision-lighting rule even before full dark.
Source: AC_107-2A.pdf, § 5.7, p. 5-4. Remote ID & night ops guide →
CTAF
Common Traffic Advisory Frequency. The frequency pilots use to self-announce position and intentions at an airport without an operating control tower.
Source: faa-h-8083-25c.pdf, Ch. 14, p. 14-2. Operations guide →
Declaration of Compliance (DoC)
A record a small UA's manufacturer or modifier submits to the FAA, certifying the aircraft meets Category 2 or Category 3 requirements for flight over people.
Source: AC_107-2A.pdf, § 4.2.4, p. 4-2. Operations Over People guide →
Density altitude
Pressure altitude corrected for non-standard temperature — effectively the altitude the aircraft "feels" it is performing at, which rises as heat and humidity increase.
Source: faa-h-8083-25c.pdf, Ch. 4, p. 4-4. Loading & Performance guide →
FRIA
FAA-Recognized Identification Area. A defined geographic area where an unmanned aircraft without Remote ID equipment may still be flown within visual line of sight.
Source: AC_107-2A.pdf, § 5.17.3, p. 5-14. Remote ID & night ops guide →
FTN
FAA Tracking Number. The ID every applicant must establish in IACRA before taking any FAA airman knowledge test — it then appears on your AKTR.
Source: AC_107-2A.pdf, § 6.6, p. 6-5. How to get your Part 107 →
IACRA
Integrated Airman Certification and Rating Application. The FAA's online system for registering for an FTN and submitting your Remote Pilot Certificate application.
Source: AC_107-2A.pdf, § 6.4.1, p. 6-1. How to get your Part 107 →
KTC
Knowledge Testing Center. The FAA-approved, PSI-operated facility where the UAG knowledge test is actually administered.
Source: AC_107-2A.pdf, § 6.7.1, p. 6-4. Test day: what to bring →
Load factor
The ratio between lift and an aircraft's weight on its structure, measured in Gs — a core loading-and-performance concept even for small UAS.
Source: faa-h-8083-25c.pdf, Ch. 5, p. 5-32. Loading & Performance guide →
MEF
Maximum Elevation Figure. A chart figure showing the highest terrain or obstacle elevation in an area, used in preflight planning to minimize the chance of an inflight collision with terrain or obstacles.
Source: faa-h-8083-25c.pdf, Ch. 2, p. 2-9. How to read a sectional chart →
METAR
Aviation Routine Weather Report. A standardized, internationally formatted observation of current surface weather conditions.
Source: faa-h-8083-25c.pdf, Glossary, p. 481. Weather guide →
MoC
Means of Compliance. A method — proposed by anyone, including a voluntary consensus standards body — for showing a small UA meets the injury-severity and exposed-rotating-parts limits for flight over people.
Source: AC_107-2A.pdf, § 8.5, p. 8-12. Operations Over People guide →
MSL
Mean Sea Level. Altitude measured from sea level rather than the ground beneath the aircraft — the reference used for charted obstruction elevations.
Source: AC_107-2A.pdf, § 5.12.1, p. 5-11. How to read a sectional chart →
NOTAM
Notice to Airmen. A notice of a temporary hazard or restriction — including most Temporary Flight Restrictions — that a remote PIC must check for before every flight.
Source: AC_107-2A.pdf, § 5.10.3, p. 5-8. Airspace guide →
RPIC
Remote Pilot in Command. The certificated person who holds final authority and responsibility for a small UAS operation's conduct and safety.
Source: AC_107-2A.pdf, § 4.2.7, p. 4-2. Regulations guide →
sUAS
small Unmanned Aircraft System. A small unmanned aircraft and its associated elements, including the control station, operated under 14 CFR Part 107.
Source: AC_107-2A.pdf, cover. Regulations guide →
TAF
Terminal Aerodrome Forecast. A forecast for the 5-statute-mile radius around an airport, using the same descriptors and abbreviations as a METAR.
Source: faa-h-8083-25c.pdf, Glossary, p. 476. Weather guide →
TFR
Temporary Flight Restriction. A temporary airspace restriction, often issued by NOTAM, that a remote PIC must check for before every flight.
Source: AC_107-2A.pdf, § 5.10.3, p. 5-8. Airspace guide →
UNICOM
A nongovernment air/ground radio station that may provide airport information at a public-use airport with no operating tower or Flight Service Station.
Source: faa-h-8083-25c.pdf, Ch. 14, p. 14-2. Operations guide →
VLOS
Visual Line of Sight. The requirement that the remote PIC and the person manipulating the controls be able to see the small unmanned aircraft, unaided except by corrective lenses, at all times during flight.
Source: AC_107-2A.pdf, § 5.9, p. 5-5. Regulations guide →
Class B airspace
Controlled airspace from the surface to roughly 10,000 ft. MSL around the nation's busiest airports. ATC authorization is required for any small UAS operation inside it.
Source: remote_pilot_study_guide.pdf, pp. 5–6. Airspace guide →
Class C airspace
Controlled airspace from the surface to about 4,000 ft. above the airport elevation, typically a 5 NM core plus a 10 NM shelf. ATC authorization is required for small UAS operations.
Source: remote_pilot_study_guide.pdf, pp. 5–6. Airspace guide →
Class D airspace
Controlled airspace from the surface to about 2,500 ft. above the airport elevation, around smaller towered airports. ATC authorization is required for small UAS operations.
Source: remote_pilot_study_guide.pdf, pp. 5–6. Airspace guide →
Class E airspace
Controlled airspace everywhere not classified B, C, or D — including surface-based extensions around some airports. ATC authorization is required only within a Class E surface area.
Source: remote_pilot_study_guide.pdf, pp. 5–6. Airspace guide →
Class G airspace
Uncontrolled airspace from the surface up to the base of the overlying controlled airspace. No ATC authorization is required for small UAS operations here.
Source: remote_pilot_study_guide.pdf, pp. 5–6. Airspace guide →
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