19 

Federal Aviation Administration, DOT 

§ 1.2 

FTD 

means flight training device. 

GS 

means glide slope. 

HIRL 

means high-intensity runway 

light system. 

IAS 

means indicated airspeed. 

ICAO 

means International Civil Avia-

tion Organization. 

IFR 

means instrument flight rules. 

IFSD 

means in-flight shutdown. 

ILS 

means instrument landing sys-

tem. 

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 mid-

dle 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 ap-

proach light system. 

MALSR 

means medium intensity ap-

proach light system with runway align-
ment indicator lights. 

MCA 

means minimum crossing alti-

tude. 

MDA 

means minimum descent alti-

tude. 

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 alti-

tude. 

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 re-

quired. 

OEI 

means one engine inoperative. 

OM 

means ILS outer marker. 

OPSPECS 

means operations specifica-

tions. 

PACOTS 

means Pacific Organized 

Track System. 

PAR 

means precision approach radar. 

PMA 

means parts manufacturer ap-

proval. 

POC 

means portable oxygen concen-

trator. 

PTRS 

means Performance Tracking 

and Reporting System. 

RAIL 

means runway alignment indi-

cator light system. 

RBN 

means radio beacon. 

RCLM 

means runway centerline 

marking. 

RCLS 

means runway centerline light 

system. 

REIL 

means runway end identifica-

tion 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 sys-

tem. 

SATCOM 

means satellite communica-

tions. 

SSALS 

means simplified short ap-

proach light system. 

SSALSR 

means simplified short ap-

proach light system with runway align-
ment indicator lights. 

TACAN 

means ultra-high frequency 

tactical air navigational aid. 

TAS 

means true airspeed. 

TCAS 

means a traffic alert and colli-

sion avoidance system. 

TDZL 

means touchdown zone lights. 

TSO 

means technical standard order. 

TVOR 

means very high frequency ter-

minal 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 dur-
ing 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. 

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