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Guidance, standards and regulatory information for the aviation industry.
Civil Aviation Publications (CAPs) and other key documents issued by the UK Civil Aviation Authority (CAA) provide authoritative guidance, standards and regulatory information for the aviation industry.
Last updated: 04 June 2025
These developments can be seen
in the wider context of the CAA’s ongoing work to expedite the widespread adoption of
electronic conspicuity utilising ADS-B across the aviation sector.
2.3 The information from ATS surveillance systems can be used to improve the situational
awareness of controllers and FISOs and assist in mitigating the risks of mid-air
collision, airspace infringement and controlled flight into terrain.
2.4 Combined, this work has resulted in amendments to Air Traffic Services Safety
Requirements (CAP 670) and Aerodrome FISO Licensing (CAP 1032) alongside the
amendments to CAP 797 and CAP 493 and now in CAP 413.
Last updated: 24 November 2022
Supplementary Instruction
CAP 413
Safety and Airspace Regulation Group
Airspace, ATM & Aerodromes
Page 1 of 5
Number: 2023/01 Issued: 7 July 2023
Issue: 1 Effective: 7 September 2023
Police, HEMS and SAR Callsigns
1 Introduction
1.1 The purpose of this Supplementary Instruction (SI) is to detail changes being made to the to the
Radiotelephony Manual (CAP 413) relating to callsign suffixes used in Police, Helicopter
Emergency Medical Services (HEMS), and Search And Rescue (SAR) activities and the
associated procedures detailed within the manual.
Last updated: 07 July 2023
Supplementary Instruction
CAP 413 Radiotelephony Manual
Safety and Airspace Regulation Group
Airspace, ATM & Aerodromes
Number 2022/01 (Issue 1) Issued: 13 January 2022
Effective Date: 24 March 2022
CAP 413 Radiotelephony Manual – Radio Mandatory Zones
1 Introduction
1.1 The purpose of this Supplementary Instruction (SI) is to detail changes made to the
Radiotelephony Manual (CAP 413) relating to radio mandatory zones (RMZ).
2 Background
2.1 The CAA has undertaken a review of its airspace policy statement for RMZ and, following
consultation with the National Air Traffic Management Advisory Committee (NATMAC), this
has resulted in the development of:
(a) new acceptable means of compliance (AMC) and guidance material (GM) to SERA.6005
(in the Annex to Reg (EU) No. 923/2012 as retained (and amended in UK domestic law)
under the European Union (Withdrawal) Act 2018); and,
(b) a revised airspace policy statement.
3 Amendment to CAP 413
3.1 With
Last updated: 13 January 2022
CAP 413 – Status
14.
Last updated: 21 April 2026
Guidance for licence holders.
If assessment is by oral examination, examiners should consider covering the following areas: Air Law aircraft documents to be carried altitude/height/transition altitude: definitions and appropriate altimeter settings questions on UK chart interpretation: In particular MSA/airspace types/ATZ/Danger Area/prohibited/restricted airspace and so on Holders Pilot licence privileges in UK Any Rules of Air questions - SERA changes UK Accident/incident/occurrence reporting requirements illness/injury-reporting/stop flying requirements/return to flying PIC with passengers' requirements: take off/landings and so on transponder codes: key codes UK Air traffic Services and ATSOCAS: Service types and what they mean position reporting ATC procedures awareness that CAP 413 Radiotelephony manual exists where to find appropriate UK radio frequencies: for example, charts, AIP, flight guides and their limitations emergency states and emergency phraseology: Mayday/Pan/Message relay types of ATC service available
Last updated: 20 December 2024
Advice for applicants.
Operators of a restricted ROCC - FDD are reminded of the guidance contained within CAP 403 and must adhere to all elements contained within.
Last updated: 01 August 2025
Not all phraseology shown in
CAP 413 Radiotelephony Manual is available to station operators.
Last updated: 30 September 2016
Chapter 1 Page 3March 2012
INTENTIONALLY LEFT BLANK
CAP 452 Aeronautical Radio Station Operator’s Guide
Chapter 2 Communications Techniques, Procedures and
Phraseology
1 Reference Material
1.1 Information about communications techniques, procedures and phraseology are
contained in CAP 413 Radiotelephony Manual (www.caa.co.uk/CAP413).
1.2 Operators of aeronautical radio stations are reminded that only the phraseology
appropriate to the service being provided is to be used.
Last updated: 23 March 2012
Regulatory oversight and operational standards.
More information can be found in CAP 670 ATS Safety Requirements Part C, Section 1, COM 04 ATC Datalinks.
Last updated: 19 September 2025
