Abbreviations and symbols.
In Subchapters A through K of this chapter:
AFM means airplane flight manual.
AGL means above ground level.
ALS means approach light system.
APU means auxiliary power unit.
ASR means airport surveillance radar.
ATC means air traffic control.
ATS means Air Traffic Service.
CAMP means continuous airworthiness maintenance program.
CAS means calibrated airspeed.
CAT II means Category II.
CHDO means an FAA Flight Standards certificate holding district office.
CMP means configuration, maintenance, and procedures.
CONSOL or CONSOLAN means a kind of low or medium frequency long range navigational aid.
DH means decision height.
DME means distance measuring equipment compatible with TACAN.
EAS means equivalent airspeed.
EFVS means enhanced flight vision system.
Equi-Time Point means a point on the route of flight where the flight time, considering wind, to each of two selected airports is equal.
ETOPS means extended operations.
, as defined by § 25.1701
of this chapter, means electrical wiring interconnection system.
FAA means Federal Aviation Administration.
FFS means full flight simulator.
FM means fan marker.
FSTD means flight simulation training device.
FTD means flight training device.
GS means glide slope.
HIRL means high-intensity runway light system.
IAS means indicated airspeed.
ICAO means International Civil Aviation Organization.
IFR means instrument flight rules.
IFSD means in-flight shutdown.
ILS means instrument landing system.
IM means ILS inner marker.
INT means intersection.
LDA means localizer-type directional aid.
LFR means low-frequency radio range.
LMM means compass locator at middle marker.
LOC means ILS localizer.
LOM means compass locator at outer marker.
M means mach number.
MAA means maximum authorized IFR altitude.
MALS means medium intensity approach light system.
MALSR means medium intensity approach light system with runway alignment indicator lights.
MCA means minimum crossing altitude.
MDA means minimum descent altitude.
MEA means minimum en route IFR altitude.
MEL means minimum equipment list.
MM means ILS middle marker.
MOCA means minimum obstruction clearance altitude.
MRA means minimum reception altitude.
MSL means mean sea level.
NDB (ADF) means nondirectional beacon (automatic direction finder).
NM means nautical mile.
NOPAC means North Pacific area of operation.
NOPT means no procedure turn required.
OEI means one engine inoperative.
OM means ILS outer marker.
OPSPECS means operations specifications.
PACOTS means Pacific Organized Track System.
PAR means precision approach radar.
PMA means parts manufacturer approval.
PTRS means Performance Tracking and Reporting System.
RAIL means runway alignment indicator light system.
RBN means radio beacon.
RCLM means runway centerline marking.
RCLS means runway centerline light system.
REIL means runway end identification lights.
RFFS means rescue and firefighting services.
RNAV means area navigation.
RR means low or medium frequency radio range station.
RVR means runway visual range as measured in the touchdown zone area.
SALS means short approach light system.
SATCOM means satellite communications.
SSALS means simplified short approach light system.
SSALSR means simplified short approach light system with runway alignment indicator lights.
TACAN means ultra-high frequency tactical air navigational aid.
TAS means true airspeed.
TCAS means a traffic alert and collision avoidance system.
TDZL means touchdown zone lights.
TSO means technical standard order.
TVOR means very high frequency terminal omnirange station.
Ameans design maneuvering speed.
Bmeans design speed for maximum gust intensity.
Cmeans design cruising speed.
Dmeans design diving speed.
DFmeans demonstrated flight diving speed.
EFmeans the speed at which the critical engine is assumed to fail during takeoff.
Fmeans design flap speed.
FCmeans maximum speed for stability characteristics.
FEmeans maximum flap extended speed.
FTOmeans final takeoff speed.
Hmeans maximum speed in level flight with maximum continuous power.
LEmeans maximum landing gear extended speed.
LOmeans maximum landing gear operating speed.
LOFmeans lift-off speed.
MCmeans minimum control speed with the critical engine inoperative.
MOmeans maximum operating limit speed.
MUmeans minimum unstick speed.
NEmeans never-exceed speed.
NOmeans maximum structural cruising speed.
Rmeans rotation speed.
REFmeans reference landing speed.
Smeans the stalling speed or the minimum steady flight speed at which the airplane is controllable.
0means the stalling speed or the minimum steady flight speed in the landing configuration.
1means the stalling speed or the minimum steady flight speed obtained in a specific configuration.
SRmeans reference stall speed.
Omeans reference stall speed in the landing configuration.
1means reference stall speed in a specific configuration.
SWmeans speed at which onset of natural or artificial stall warning occurs.
VTOSSmeans takeoff safety speed for Category A rotorcraft.
Xmeans speed for best angle of climb.
Ymeans speed for best rate of climb.
1means the maximum speed in the takeoff at which the pilot must take the first action (e.g., apply brakes, reduce thrust, deploy speed brakes) to stop the airplane within the accelerate-stop distance. V1also means the minimum speed in the takeoff, following a failure of the critical engine at VEF, at which the pilot can continue the takeoff and achieve the required height above the takeoff surface within the takeoff distance.
2means takeoff safety speed.
2minmeans minimum takeoff safety speed.
VFRmeans visual flight rules.
VHFmeans very high frequency.
VORmeans very high frequency omnirange station.
VORTACmeans collocated VOR and TACAN.
[Doc. No. 1150, 27 FR 4590, May 15, 1962]
For Federal Register
citations affecting § 1.2
, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.fdsys.gov