More important ATC Clearance abbreviations

ABM

abeam

ABV

above

@

at

at or above (not below)

at or below (not above)

BL

base leg

BPOC

before proceeding on course

BLO

below

CNL

cancel

cancel IFR

CS

centre stored

CSR

centre stored route

CCZ

clear of (control) zone

CX

clearance, cleared to

CC

clearance cancelled

A

cleared to the airport for an approach

F

cleared to an airport

AI

cleared for ILS approach

ASI

cleared to the airport, straight-in ILS approach

AV

cleared to the airport, visual approach

AO

cleared to the airport, VOR approach

N(ident)

cleared to (name) NDB

AK

cleared for a contact approach

O (ident)

cleared to (name) VOR

B

cleared out of controlled airspace

climb

CNA

climb not above

RH

runway heading

COC

climb on course

CTAM

climb to and maintain

CFP

close flight plan

CFI

close flight itinerary

CTC

contact

TWR

control towers

CZ

control zone

X

cross(ing)

DR

depart runway

descend

DTAM

descend to and maintain

direct

DNCA

do not climb above

DNDU (time/event)

do not depart until (time/event)

D/C

down and clear

EAC (time)

expect approach clearance at (time)

EACNL (time)

expect approach clearance not later than (time)

EFC (time)

expect further clearance at (time)

EHATO

expect higher after takeoff

EHR

expect higher en route

FPR

flight plan route

HDG

heading

ICA

in control airspace

intercept

INT

intersection

EMA

in the event of a missed approach

M (altitude)

maintain (altitude)

NA

not above

NBFR

not before

OC

on course

PP

present position

POC

proceed on course

RDL

radial

RE

report established

RL

report leaving

RLVL

report level

RP

report passing

RR

report reaching

RD

report down

RQ

request or requested

#(transponder code)

squawk

SI

straight-in

TL

turn left

TR

turn right

UNA

unable

TIL

until

UFA

until further advised

VDA

VFR departure approved

WICA

while in controlled airspace

EH(reason)

expect higher (reason)

UFN

until further notice

not above

not below