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Describes how airspace
changes can improve access for other
airspace users by reducing the net
volume of controlled airspace and
enabling integration, in conjunction
with the widespread adoption of
electronic conspicuity technology.
Last updated: 11 May 2022
Your transponder must always be switched
to mode C (ALT) when airborne, with the
appropriate conspicuity code (VFR – 7000) or
Frequency Monitoring Code (FMC) set, unless
instructed otherwise.
Last updated: 18 April 2024
Minimum meteorological conditions: sufficient meteorological conditions to maintain
VMC minima plus additional requirements to increase visible conspicuity.
Last updated: 22 June 2026
OFFICIAL - Public
Appendices
Appendix: Abbreviations
Abbreviation Description
AAM Advanced Air Mobility
ANAC National Civil Aviation Agency of Brazil
ANSP Air Navigation Service Provider
AOC Air Operator Certificate
ATC Air Traffic Control
CA Control Action
CAA Civil Aviation Authority
CAP Civil Aviation Publication
CAST Causal Analysis based on Systems Theory
CAT Commercial Air Transport
CF Causal Factor
CIF Controller Impact Factor
CPL Commercial Pilot Licence
DAL Design Assurance Level
EASA European Union Aviation Safety Agency
EC Electronic Conspicuity
EJ Expert Judgement
ETA Event Tree Analysis
eVSLG eVTOL Safety Leadership Group
eVTOL electric vertical take-off and landing
FAA Federal Aviation Administration
FMEA Failure Mode and Effects Analysis
FTA Fault Tree Analysis
G350 Gaseous Hydrogen 350BAR
44
OFFICIAL - Public.
Last updated: 20 July 2026
First published 2018
The latest version of this document is available in electronic format at: www.caa.co.uk
January 2018 Page 3
Contents
1.
Last updated: 09 January 2018
The analysis showed a need to implement Electronic Conspicuity (EC) (or
similar capabilities) especially for helicopter operations when used for special events,
and other high density traffic scenarios, due to the volume and workload of each of the
stakeholders involved.
Last updated: 11 August 2025
Consideration also needs to be given to the wider use of
drones and the conspicuity challenge they bring.
Last updated: 18 July 2018
This would correlate with continued concerns
as documented in company risk logs for the need of electronic conspicuity for those
operating in Class G airspace.
Last updated: 29 November 2019
The various
methods of electronic conspicuity combined with radar sources means there
are a number of options to consider to fully inform the use of the UK’s
airspace.
Last updated: 30 November 2020
First published September 2024
Enquiries regarding the content of this publication should be addressed to: airspace.classification@caa.co.uk
The latest version of this document is available in electronic format at: www.caa.co.uk/CAP3027
mailto:airspace.classification@caa.co.uk
CAP 3027 Contents
September 2024 Page 3
OFFICIAL - Public.
Last updated: 12 September 2024
