Organizations/ Publications
Charts
Terminal
Weather Reporting
Definition to Abbreviation
100

ATO

Air Traffic Organization

100

DA

Decision Altitude

100

EFC

Expect Further Clearance

100

RVR

Runway Visual Range

100

A person authorized to provide air traffic control service.   

ATCS (Air Traffic Control Specialist)

200

NWS

National Weather Service

200

TCH

Threshold Crossing Height

200

TDZL

Touchdown Zone Lighting

200

CWC

Center Weather Coordinator

200

An airborne collision avoidance system based on radar beacon signals that operates independent of ground-based equipment.

TCAS (Traffic Alert & Collision Avoidance System)

300

AIM

Aeronautical Information Manual

300
RCO

Remote Communications Outlet

300

ASR

Airport Surveillance Radar

300

TEIs

Text Element Indicators
300

A call sign prefix used by FAA aircraft engaged in flight inspection/certification of navigational aids and flight procedures. 

FLC (Flight Check)

400

ICAO

International Civil Aviation Organization

400

MDA

Minimum Descent Altitude

400
RCLS

Runway Centerline Lights

400
METAR

Aviation Routine Weather Report

400

That portion of civil aviation which encompasses all facets of aviation, except air carriers holding a certificate of public convenience and necessity from the Civil Aeronautics Board and large aircraft commercial operators.  

GA (General Aviation)

500

TPP

US Terminal Procedures Publications

500
MOCA

 Minimum Obstruction Clearance Altitude

500

PDR

Preferential Departure Route

500

FB

Wind and Temperature Aloft Forecast

500

The ability, as determined by atmospheric conditions and expressed in units of distance, to see and identify prominent unlighted objects by day and prominent lighted objects by night. 

VIS (Visibility)