CAA Papers & Reports

CAA Notifications on Papers and Reports


CAA Paper 2012/01: The Application of Advanced Anomaly Detection to Tail Rotor HUMS Data
This paper reports on the application of advanced anomaly detection (AAD) techniques successfully developed and demonstrated on HUMS data for helicopter transmissions, reported in CAA Paper 2011/01, to the analysis of HUMS vibration health monitoring data for helicopter tail rotors currently collected in-service.

The study focuses on three tail rotor failures for which data is available, and also a database of historical Bristow Helicopters Eurocopter AS332L IHUMS data. This work builds on the investigation of the extension of HUMS to helicopter rotors reported in CAA Paper 2008/05
Dated: March 2013


Report 2012/01: Flight Data Monitoring Based Precursors Project: Part 1 – Runway Excursions
The report covers the CAA’s investigation into, and the development of, practicable Flight Data Monitoring (FDM) based precursors related to Runway Excursions (focusing on Landing Runway Overruns). The investigation was carried out in collaboration with a major UK Operator and the FDM software developer Aerobytes.

The CAA wishes to share its findings and recommendations with industry to facilitate their own efforts to effectively monitor and control this key area of aviation safety through FDM. The information will be of particular interest to Operators who already run FDM programmes and those who plan on implementing one. The project is the first in a series that will address, through FDM precursors of accidents, some of the ‘Significant 7’ areas of risk to UK aviation identified in the CAA’s Safety Plan.

Dated: December 2012 


CA939: Report on alleged infringements of air navigation legislation

Report on alleged infringements of air navigation legislation
Note: Please complete this form online then print, sign and forward to the address given. You can also save a copy for your records.
Dated: July 2012



CAA Paper 2012/03: Specification for an Offshore Helideck Lighting System

This paper reports on the development of a specification for the new offshore helideck lighting scheme introduced in the 7th Edition of CAP 437, Standards for Offshore Helicopter Landing Areas. Building on the experimental trials reported in CAA Papers 2004/01, 2005/01 and 2006/03, a draft specification was produced and used to tender for the manufacture of a prototype lighting system for installation on an offshore platform for in-service evaluation. The paper describes the development of the initial specification, reports on the trials performed and presents the final version of the lighting system specification which is also contained in CAP 437 7th Edition.
Dated: May 2012


CAA Paper 2011/01: Intelligent Management of Helicopter Vibration Health Monitoring Data

This paper reports on the development and in-service evaluation of an Advanced Anomaly Detection (AAD) system for enhancing the performance of helicopter health and usage monitoring systems (HUMS) through improved analysis of vibration health monitoring data. Potential future enhancements such as data mining and automated reasoning are also explored. This work builds on the work performed on intelligent management of HUMS data reported in CAA Paper 99006.
Dated: May 2012


Paper 2006/06: Evaluation of and Possible Improvements to Current Methods for Protecting Hot-Air Balloon Passengers During Landing

The guidance that hot-air balloon operators provide on the passenger position to be adopted during landing varies and none have been subjected to scientific scrutiny. The objectives of this study were to evaluate by numerical simulations, current methods for protecting passengers of balloons during landings, and to propose possible improvements. The protection methods include the passenger landing positions as well as the protective measures in the basket.
Dated: December 2011


CAA Paper 2011/03: CAA ‘Significant Seven’ Task Force Reports

CAA Paper 2011/03 consolidates the findings and recommendations of the joint CAA-industry ‘Significant Seven’ task forces into one document. The ‘Significant Seven’ covers: loss of control, runway overrun or excursion, controlled flight into terrain, runway incursion and ground collision, ground handling and airborne and post-crash fire. (Annex A of the Paper can be read as a stand-alone document. It summarises the key output from each of the task forces and provides an update on progress made since the task forces reported their findings.)
NOTE: The Paper has been reloaded to reflect the correction of an error in Annex A, Appendix 1.

Dated: July 2011



Report 2011/04: An Independent Review of the Civil Aviation Authority’s Claims Handling Procedures
Consultation on the Civil Aviation Authority’s Air Travel Organisers’ Licensing (ATOL) Scheme Claims Handling Procedures

Dated: May 2011 


CAA Paper 2011/03: CAA ‘Significant Seven’ Task Force Reports

CAA Paper 2011/03 consolidates the findings and recommendations of the joint CAA-industry ‘Significant Seven’ task forces into one document. The ‘Significant Seven’ covers: loss of control, runway overrun or excursion, controlled flight into terrain, runway incursion and ground collision, ground handling and airborne and post-crash fire.
Dated: March 2011



CAA Paper 2009/02: The Aerodynamics of Gyroplanes
This report describes research work undertaken for the Civil Aviation Authority by the University of Glasgow between November 1993 and June 2008 under the study entitled Aerodynamics of Gyroplanes, instigated by the 1991 Air Accidents Investigation Branch (AAIB) review of the airworthiness of Air Command series of gyroplanes. Elements of this study include analytical, wind tunnel and flight test activities. Research included the comparison of a mathematical model of the aircraft validated against actual flight test data. The Report also presents results from a number of associated studies, a literature review, a study of teeter margin, an assessment of blade flexibility on rotor and aircraft stability and a review of BCAR Section T.
Dated: August 2010



CAA Paper 2010/01: The SBAS Offshore Approach Procedure (SOAP)
The report describes the development and preliminary evaluation of a new GPS-guided helicopter offshore approachprocedure. The project comprised piloted simulation trials to evaluate the ‘flyability’ of the procedure, a safetyassessment covering both the ‘success’ and ‘failure’ cases, light trials to collect geostationary satellite (EGNOS)reception data, and an assessment of likely system availability.
Dated: May 2010

CAA Paper 2009/06: Hazard Analysis of the Use of GPS in Offshore Helicopter Operations
The report details the three-part hazard analyses performed for helicopter offshore operations on the UK continentalshelf. Part 1 addresses the use of GPS for en-route navigation. Part 2 covers the existing ‘basic’ offshore weatherradar approach. Part 3 deals with an ‘enhanced’ offshore weather radar approach which utilises existing North Seahelicopter GPS equipment to underpin the ‘basic’ weather radar approach. In each analysis, the individual hazardsand their potential consequences are identified and are then mapped onto conflict scenarios. The conflict scenariosare then assessed for severity and probability and the resulting risk compared with a modified JAA AMJ 25.1309 risk
Dated: February 2010


CAA SRG Organisational Chart

Dated: October 2009


CAA Paper 2008/03: Helideck Design Considerations – Environmental Effects
The report contains guidance on good offshore helideck design practise in terms of environmental issues. This material was generated in support of Offshore Helideck Design Guidelines document published by the Health & Safety Commission on behalf of the Offshore Industry Advisory Committee Helicopter Liaison Group, and forms a section within that document. This material was originally published in CAA Paper 2004/02, and has been updated to take account of progress in several research areas. In particular, a turbulence criterion has been introduced and the original vertical flow criterion removed (see CAA Papers 2004/03 and 2008/02).
Dated: July 2009