CAP 413
Radiotelephony Manual
Chapter 1 Page 5
Straight Ahead
When used in departure clearances means: ‘track extended
runway centre-line’. When given in Missed Approach Procedures means: ‘continue
on Final Approach Track’.
Terminal Control Area
A control area normally established at the confluence of
airways in the vicinity of one or more major aerodromes (ICAO).
Threshold
The beginning of that portion of the runway useable for landing (ICAO).
Traffic Alert and Collision Avoidance System (TCAS)
See Airborne Collision
Avoidance System (ACAS).
Traffic Service
A Traffic Service is a surveillance ATS, where in addition to the
provisions of a Basic Service, the controller provides specific surveillance derived
traffic information to assist the pilot in avoiding other traffic. Controllers may provide
headings and/or levels for the purposes of positioning and/or sequencing; however,
the controller is not required to achieve deconfliction minima, and the avoidance of
other traffic is ultimately the pilot’s responsibility.
Vectoring
Provision of navigational guidance to aircraft in the form of specific
headings, based on the use of an ATS surveillance system (ICAO).
VFR Flight
A flight conducted in accordance with the visual flight rules (RoA).
Visual Meteorological Conditions (VMC)
Weather permitting flight in accordance
with the Visual Flight Rules (ANO).
1.2
Abbreviations
1.2.1
The following abbreviations are those in common use in the United Kingdom. If RTF
transmission of an abbreviation is required, and the format is not specified in this
document, the format specified by ICAO (see ICAO PANS-ABC Doc. 8400) should be
used. If no format is defined, the abbreviation should be described using the phonetic
alphabet.
1.2.2
The abbreviations annotated with an asterisk are normally spoken as complete words.
The remainder are normally spoken using the constituent letters rather than the
spelling alphabet. Military abbreviations are marked with '(M)'.
A
AAIB
Air Accident Investigation Branch
aal
Above Aerodrome Level
ACAS*
Airborne Collision Avoidance System (pronounced A-kas) (see TCAS)
ACC
Area Control Centre
ADF
Automatic Direction-Finding Equipment
ADR
Advisory Route
ADT
Approved Departure Time
AEF
Air Experience Flight (M)
AFTN
Aeronautical Fixed Telecommunication Network
AFIS
Aerodrome Flight Information Service
AGCS
Air Ground Communication Service
agl
Above Ground Level
31 March 2011
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