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Abbreviations and symbols.
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.

EWIS , as defined by ยง25.1701 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.

V A means design maneuvering speed.

V B means design speed for maximum gust intensity.

V C means design cruising speed.

V D means design diving speed.

V DF/ M DF means demonstrated flight diving speed.

V EF means the speed at which the critical engine is assumed to fail during takeoff.

V F means design flap speed.

V FC/ M FC means maximum speed for stability characteristics.

V FE means maximum flap extended speed.

V FTO means final takeoff speed.

V H means maximum speed in level flight with maximum continuous power.

V LE means maximum landing gear extended speed.

V LO means maximum landing gear operating speed.

V LOF means lift-off speed.

V MC means minimum control speed with the critical engine inoperative.

V MO/ M MO means maximum operating limit speed.

V MU means minimum unstick speed.

V NE means never-exceed speed.

V NO means maximum structural cruising speed.

V R means rotation speed.

V REF means reference landing speed.

V S means the stalling speed or the minimum steady flight speed at which the airplane is controllable.

V S0 means the stalling speed or the minimum steady flight speed in the landing configuration.

V S1 means the stalling speed or the minimum steady flight speed obtained in a specific configuration.

V SR means reference stall speed.

V SRO means reference stall speed in the landing configuration.

V SR1 means reference stall speed in a specific configuration.

V SW means speed at which onset of natural or artificial stall warning occurs.

VTOSS means takeoff safety speed for Category A rotorcraft.

V X means speed for best angle of climb.

V Y means speed for best rate of climb.

V 1 means 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. V1 also 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.

V 2 means takeoff safety speed.

V 2min means minimum takeoff safety speed.

VFR means visual flight rules.

VHF means very high frequency.

VOR means very high frequency omnirange station.

VORTAC means collocated VOR and TACAN.

Here are further guidelines.