MTI Moving Target Indicator. MTTR Mean Time To Repair.
N
NATS National Air Traffic Services Limited.
NDB Non-Directional Beacon.
NM Nautical Mile.
NOTAM Notice To Airmen.
O
OPC Operational Control.
OR Operational Requirement.
P
PAPI Precision Approach Path Indicator.
PE Primary Echo.
PES Proposed Eurocontrol Standard.
PFE Path Following Error.
PFN Path Following Noise.
PIATS Principal Inspector of Air Traffic Services.
PRF Pulse Repetition Frequency.
PSIL Perceived Speech Interference Level.
PSR Primary Surveillance Radar.
PTT Press To Talk.
Q
QNH The pressure to be set on the sub-scale of an aircraft altimeter that would read the aerodrome elevation if the aircraft were on the ground at that aerodrome. (ICAO Abbreviations and codes Doc. 8400).
R
R&TTED Radio and Telecommunications Terminal Equipment Directive.
RAF Royal Air Force.
RFFS Rescue and Fire Fighting Service.
RN Royal Navy.
RPM Revolutions per minute.
RPS Radar Position Symbol.
RSLS Receiver Side Lobe Suppression.
RSS The Square-root of the Sum of the Squares.
R/T Radio Telephone.
RTF Radio Telephone Facility.
RVR Runway Visual Range.
S
SAR Search and Rescue.
SARPs Standards and Recommended Practices (ICAO).
SBO Side Band Oscillator.
ScOACC Scottish and Oceanic Area Control Centre.
SD CAA Safety Directive.
SDM Sum of the Depths of Modulation.
SES Single European Sky.
SI Supplementary Instruction.
SID Standard Instrument Departure.
SIL Speech Interference Level.
SMGCS Surface Movement Guidance and Control System.
SMR Surface Movement Radar.
SN CAA Safety Notice.
SPI Special Position Identification.
SRA Surveillance Radar Approach.
SRATCOH Scheme for the Regulation of Air Traffic Controllers’ Hours.
SRG Safety Regulation Group.
SSR Secondary Surveillance Radar.
STO Station Telecommunications Officer.
STP Stop end of a runway.
SVFR Special Visual Flight Rules.
T
TDZ Touch Down Zone (Runway).
THD Total Harmonic Distortion.
TLS Target Level of Safety.
TMA Terminal Manoeuvring Area.
TOI Temporary Operating Instruction.
U
UHF Ultra High Frequency.
UTC Universal Co-ordinated Time.
VCCS Voice Communications Control Systems.
VCR Visual Control Room.
VDF VHF Direction Finding.
VDU Visual Display Unit.
VFR Visual Flight Rules.
VHF Very High Frequency.
VMC Visual Meteorological Conditions.
VOR VHF Omni-directional Range.
VSWR Voltage Standing Wave Ratio.
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