§ 1.2 Abbreviations and symbols.

In 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.

CMP

means configuration, maintenance, and procedures.

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 § 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

roach 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.

POC

means portable oxygen concentrator.

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

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

S

0

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

V

S

1

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

V

SR

means reference stall speed.

V

SR

O

means reference stall speed in the landing configuration.

V

SR

1

means reference stall speed in a specific configuration.

V

SW

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

V

TOSS

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

ch onset of natural or artificial stall warning occurs.

V

TOSS

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. V

1

also means the minimum speed in the takeoff, following a failure of the critical engine at V

EF

, 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.

VGSI

means visual glide slope indicator.

VHF

means very high frequency.

VOR

means very high frequency omnirange station.

VORTAC

means collocated VOR and TACAN.

[Doc. No. 1150, 27 FR 4590, May 15, 1962]

Editorial Note:

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.govinfo.gov.