Q Subject:
AA = Minimum altitude (specify en route/crossing/safe)
AC = Class B, C, D, or E Surface Area
AD = Air defense identification zone
AE = Control area
AF = Flight information region
AH = Upper control area
AL = Minimum usable flight level
AN = Area navigation route
AO = Oceanic control area
AP = Reporting point (specify name or coded designator)
AR = ATS route (specify)
AT = Terminal control area
AU = Upper flight information region
AV = Upper advisory area
AX = Significant point
AZ = Aerodrome traffic zone
CA = Air/ground facility (specify service and frequency)
CB = Automatic dependent surveillance - broadcast (details)
CC = Automatic dependent surveillance - contract (details)
CD = Controller-pilot data link communications (details)
CE = En route surveillance radar
CG = Ground controlled approach system (GCA)
CL = Selective calling system (SELCAL)
CM = Surface movement radar
CP = Precision approach radar (PAR) (specify runway)
CR = Surveillance radar element of precision approach radar system (specify wavelength)
CS = Secondary surveillance radar (SSR)
CT = Terminal area surveillance radar (TAR)
FA = Aerodrome
FB = Friction measuring device (specify type)
FC = Ceiling measurement equipment
FD = Docking system (specify AGNIS, BOLDS, etc.)
FE = Oxygen (specify type)
FF = Fire fighting and rescue
FG = Ground movement control
FH = Helicopter alighting area/platform
FI = Aircraft de-icing (specify)
FJ = Oils (specify type)
FL = Landing direction indicator
FM = Meteorological service (specify type)
FO = Fog dispersal system
FP = Heliport
FS = Snow removal equipment
FT = Transmissometer (specify runway and, where applicable, designator(s) of transmissometer(s))
FU = Fuel availability
FW = Wind direction indicator
FZ = Customs/immigration
GA = GNSS airfield-specific operations (specify operation)
GW = GNSS area-wide operations (specify operation)
IC = Instrument landing system (specify runway)
ID = DME associated with ILS
IG = Glide path (ILS) (specify runway)
II = Inner marker (ILS) (specify runway)
IL = Localizer (ILS) (specify runway)
IM = Middle marker (ILS) (specify runway)
IN = Localizer (not associated with ILS)
IO = Outer marker (ILS) (specify runway)
IS = ILS Category I (specify runway)
IT = ILS Category II (specify runway)
IU = ILS Category III (specify runway)
IW = Microwave landing system (MLS) (specify runway)
IX = Locator, outer (ILS) (specify runway)
IY = Locator, middle (ILS) (specify runway)
LA = Approach lighting system (specify runway and type)
LB = Aerodrome beacon
LC = Runway centre line lights (specify runway)
LD = Landing direction indicator lights
LE = Runway edge lights (specify runway)
LF = Sequenced flashing lights (specify runway)
LG = Pilot-controlled lighting
LH = High intensity runway lights (specify runway)
LI = Runway end identifier lights (specify runway)
LJ = Runway alignment indicator lights (specify runway)
LK = Category II components of approach lighting system (specify runway)
LL = Low intensity runway lights (specify runway)
LM = Medium intensity runway lights (specify runway)
LP = Precision approach path indicator (specify runway)
LR = All landing area lighting facilities
LS = Stopway lights (specify runway)
LT = Threshold lights (specify runway)
LU = Helicopter approach path indicator
LV = Visual approach slope indicator system (specify type and runway)
LW = Heliport lighting
LX = Taxiway centre line lights (specify taxiway)
LY = Taxiway edge lights (specify taxiway)
LZ = Runway touchdown zone lights (specify runway)
MA = Movement area
MB = Bearing strength (specify part of landing area or movement area)
MC = Clearway (specify runway)
MD = Declared distances (specify runway)
MG = Taxiing guidance system
MH = Runway arresting gear (specify runway)
MK = Parking area
MM = Daylight markings (specify threshold, centre line, etc.)
MN = Apron
MO = Stopbar (specify runway)
MP = Aircraft stands (specify)
MR = Runway (specify runway)
MS = Stopway (specify runway)
MT = Threshold (specify runway)
MU = Runway turning bay (specify runway)
MW = Strip/shoulder (specify runway)
MX = Taxiway(s) (specify)
MY = Rapid exit taxiway (specify)
NA = All radio navigation facilities (except...)
NB = Nondirectional radio beacon
NC = DECCA
ND = Distance measuring equipment (DME)
NF = Fan marker
NL = Locator (specify identification)
NM = VOR/DME
NN = TACAN
NO = OMEGA
NT = VORTAC
NV = VOR
OA = Aeronautical information service
OB = Obstacle (specify details)
OE = Aircraft entry requirements
OL = Obstacle lights on ... (specify)
OR = Rescue coordination centre
PA = Standard instrument arrival (specify route designator)
PB = Standard VFR arrival
PC = Contingency procedures
PD = Standard instrument departure (specify route designator)
PE = Standard VFR departure
PF = Flow control procedure
PH = Holding procedure
PI = Instrument approach procedure (specify type and runway)
PK = VFR approach procedure
PL = Flight plan processing (filing and related contingency)
PM = Aerodrome operating minima (specify procedure and amended minimum)
PN = Noise operating restriction
PO = Obstacle clearance altitude and height (specify procedure)
PR = Radio failure procedure
PT = Transition altitude or transition level (specify)
PU = Missed approach procedure (specify runway)
PX = Minimum holding altitude (specify fix)
PZ = ADIZ procedure
RA = Airspace reservation (specify)
RD = Danger area (specify)
RM = Military operating area
RO = Overflying of ... (specify)
RP = Prohibited area (specify)
RR = Restricted area (specify)
RT = Temporary restricted area (specify area)
SA = Automatic terminal information service
SB = ATS reporting office
SC = Area control centre
SE = Flight information service
SF = Aerodrome flight information service
SL = Flow control centre
SO = Oceanic area control centre
SP = Approach control service
SS = Flight service station
ST = Aerodrome control tower
SU = Upper area control centre
SV = VOLMET broadcast
SY = Upper advisory service (specify)
WA = Air display
WB = Aerobatics
WC = Captive balloon or kite
WD = Demolition of explosives
WE = Exercises (specify)
WF = Air refueling
WG = Glider flying
WH = Blasting
WJ = Banner/target towing
WL = Ascent of free balloon
WM = Missile, gun or rocket firing
WP = Parachute jumping exercise, paragliding, or hang gliding
WR = Radioactive materials or toxic chemicals (specify)
WS = Burning or blowing gas
WT = Mass movement of aircraft
WU = Unmanned aircraft
WV = Formation flight
WW = Significant volcanic activity
WY = Aerial survey
WZ = Model flying
XX = not specified
Q Status:
AC = Withdrawn for maintenance
AD = Available for daylight operation
AF = Flight checked and found reliable
AG = Operating but ground checked only, awaiting flight check
AH = Hours of service are now?(specify)
AK = Resumed normal operations
AL = Operative (or reoperative) subject to previously published limitations/conditions
AM = Military operations only
AN = Available for night operation
AO = Operational
AP = Available, prior permission required
AR = Available on request
AS = Unserviceable
AU = Not available (specify reason if appropriate)
AW = Completely withdrawn
AX = Previously promulgated shutdown has been canceled
CA = Activated
CC = Completed
CD = Deactivated
CE = Erected
CF = Operating frequency(ies) changed to
CG = Downgraded to
CH = Changed
CI = Identification or radio call sign changed to
CL = Realigned
CM = Displaced
CN = Canceled
CO = Operating
CP = Operating on reduced power
CR = Temporarily replaced by
CS = Installed
CT = On test, do not use
HA = Braking action is ...
HB = Friction coefficient is ... (specify friction measurement device used)
HC = Covered by compacted snow to depth of
HD = Covered by dry snow to a depth of
HE = Covered by water to a depth of
HF = Totally free of snow and ice
HG = Grass cutting in progress
HH = Hazard due to (specify)
HI = Covered by ice
HJ = Launch planned ... (specify balloon flight identification or project code name, launch site, planned period of launch(es)-date/ time, expected climb direction, estimate time to pass 18 000 m (60 000 ft), or reaching cruise level if at or below 18 000 m (60 000 ft), together with estimated location)
HK = Bird migration in progress
HL = Snow clearance completed
HM = Marked by
HN = Covered by wet snow or slush to a depth of
HO = Obscured by snow
HP = Snow clearance in progress
HQ = Operation canceled ... (specify balloon flight identification or project code name)
HR = Standing water
HS = Sanding in progress
HT = Approach according to signal area only
HU = Launch in progress ... (specify balloon flight identification or project code name, launch site, date/time of launch(es), estimated time passing 18 000 m (60 000 ft), or reaching cruising level if at or below 18 000 m (60 000 ft), together with estimated location, estimated date/time of termination of the flight, and planned location of ground contact when applicable)
HV = Work completed
HW = Work in progress
HX = Concentration of birds
HY = Snow banks exist (specify height)
HZ = Covered by frozen ruts and ridges
LA = Operating on auxiliary power supply
LB = Reserved for aircraft based therein
LC = Closed
LD = Unsafe
LE = Operating without auxiliary power supply
LF = Interference from
LG = Operating without identification
LH = Unserviceable for aircraft heavier than
LI = Closed to IFR operations
LK = Operating as a fixed light
LL = Usable for length of...and width of...
LN = Closed to all night operations
LP = Prohibited to
LR = Aircraft restricted to runways and taxiways
LS = Subject to interruption
LT = Limited to
LV = Closed to VFR operations
LW = Will take place
LX = Operating but caution advised due to
XX = Where 4th and 5th letter Code does not cover the situation, use XX and supplement by plain language
Traffic:
I = IFR
V = VFR
IV = IFR+VFR
Scope:
A = Aerodrome
E = Enroute
W = Warning
AE = Aerodrome/Enroute
AW = Aerodrome/Warning
K = Checklist
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