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19 

Federal Aviation Administration, DOT 

ยง 1.2 

FSTD  means flight simulation train-

ing 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 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. 

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. 

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