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Supplementary Instruction
CAP 413 Radiotelephony Manual
Safety and Airspace Regulation Group
Airspace, ATM and Aerodromes
Number 2021/03 (Issue 1) Issued: 18 February 2021
Effective Date: 20 May 2021
CAP 413 Radiotelephony Manual – Flight Priorities
1 Introduction
1.1 The purpose of this Supplementary Instruction (SI) is to detail changes made to the
Radiotelephony Manual (CAP 413) relating to flight priorities involving Search and Rescue
(SAR) aircraft.
2 Background
2.1 Following the national response to COVID-19 that required SAR operators to additionally
undertake Helicopter Emergency Medical Services (HEMS) flights, a review of the flight
priorities table within MATS Part 1 section 1, chapter 4 was undertaken.
2.2 This review has resulted in the following changes to CAP 413:
(a) the addition of text detailing the priorities applicable to SAR flights, including SAR
helicopter flights undertaking HEMS tasks.
3 Amendment to CAP
Last updated: 18 February 2021
Supplementary Instruction
CAP 413
Safety and Airspace Regulation Group
Airspace, ATM & Aerodromes
Page 1 of 4
Number: 2024/01 Issued: 21 February 2024
Issue: 1 Effective: 22 April 2024
Special Use Airspace Activity Information and Crossing
Services
1 Introduction
1.1 The purpose of this Supplementary Instruction (SI) is to detail changes being made to the
Radiotelephony Manual (CAP 413) following the introduction of the Policy for the
establishment and operation of Special Use Airspace (SUA), dated 12 February 2024.
2 Background
2.1 The SUA Policy Statement amends the terms danger area crossing service (DACS) and
danger area activity information service (DAAIS) to SUA crossing service and SUA activity
information service.
Last updated: 21 February 2024
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
G-BXBU.
CAA Update Date 24/12/2024 The CAA has reviewed the content of CAP 493 MATS Pt 1, CAP 797, Flight Information Service Officer (FISO) Manual and CAP 413 Radiotelephony manual and have determined that they provide sufficient and appropriate content relating to the information that should be exchanged in an emergency situation.
Last updated: 20 March 2026
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
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
Not all phraseology shown in
CAP 413 Radiotelephony Manual is available to station operators.
Last updated: 30 September 2016
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
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
