Employment & Aviation Consulting

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Mark Prior

Curriculum Vitae: Mark Prior

Rotary Pilot & Expert Witness

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Mark Prior
  Aviation Consultant & Expert Witness



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Flying Hours:

Total Time: 7,500 hours (split equally between civil & military operations)


Flying Ratings:

Airline Transport Pilot (ATPL(H)) Helicopters with Instrument Rating
EASA Class 1 Flight Test Rating with additional approvals when operating under a Part 21J Design Organisation’s Flight Test Approvals
Formerly rated on:
Aerospatiale SA340 Gazelle, Super Puma Mk1 & Super Puma Mk2, AS350,
Sikorsky S61, Eurocopter EC225, Bell 212 & Bell 412


Key Roles and Appointments:

Co-lead for the ICAO Helicopter All Weather Operations (AWOPS) workstream & member of the ICAO Helicopter Sub Committee
Member of the EASA All Weather Operations Rule Making Task
Member of the CAA H-TAWS (Helicopter Terrain Awareness and Warning System) Research Group
Member of the RTCA Special Committee 212 H-TAWS Committee
Member of EASA Ops 001 Group - transposing JAR OPS 1 & 3 into EASA Part Ops
Member of the EASA Safety Standards Consultative Committee
Member of the JAA Helicopter Sub-Sectorial Team which developed JAR OPS 3


Professional Bodies:

The Association of Personal Injury Lawyers (APIL) Expert
Fellow of the Royal Aeronautical Society (RAeS) & a member of the RAeS Rotorcraft Committee


Career  History:


2017 - date

GMR Consulting, UK & USA
Aviation Consultant and Expert Witness
Provide Expert Witness services in connection with aviation accidents, including research, analysis & accident reconstruction. Accept instructions from Claimant & Defendant lawyers.


 2016 - date

M Prior Consulting Ltd, UK
Technical Director
Provide clients with technical, regulatory & safety expertise to enhance their operational efficiency, effectiveness & risk management. Current projects include:

  • H-TAWS (HelicopterTerrain Awareness and Warning System) research for the UK CAA to refine offshore Mode 1-7 thresholds using Flight Data Monitoring;
  • Operational Expert for a CAA safety study, in conjunction with Helios Technology, on the safety of automated offshore approaches;
  • Supporting the rewriting of the MOD Helicopter Certification Regulations in Def Stan 00-970;
  • Compliance Verification Engineer (CVE) for a Part 21J Design Office. Areas of expertise include aircraft performance & handling, cockpit ergonomics, safety systems & OSD;
  • Safety audits for oil & gas clients & a non-UK Coast Guard.

1998 - 2016
     (2000 - 2016)

Bristow Group, UK
Group Chief Test Pilot
Responsible for the flight testing of modifications developed by the Bristow Part 21J Design Office, which has EASA and CASA Part 27/29 Approvals. Associated with this role was being a Certification Verification Engineer for Bristow modifications regarding cockpit design, performance, aircraft handling & human factors. In addition, the role involved the development of Safety System Assessments & compilation of Certification Plans. Additionally, assessed new aircraft & systems for commercial air transport operations & SAR. These types included the S92, EC225, H175, AW139, AW189, S76D & most recently the AW609 tiltrotor. For a number of years held dual military/civil currency on the Squirrel, Bell 212 & Bell 412 as Bristow provided these types to the MOD, as it was a contractor in the Defence Helicopter Flying School.

      (2014 - 2016)

Senior Manager Safety Analysis
Responsible for the management of the Global Aviation Safety Office which processes, analyses & investigates accidents & incidents affecting the Bristow Group worldwide; this included rotary offshore, SAR & military training as well as fixed wing operations.

      (2010 - 2014)

Manager Global Operational Standards
Responsible for the design, implementation & auditing of standards across the Group, as well as subcontractors, suppliers and affiliates.   Lead auditor for supplier audits by Bristow into the design, certification & production of aircraft from 3 major helicopter manufacturers. 

      (1998 - 2000)

Aircraft Commander
Operated in the all weather IFR offshore commercial air transport role.


1979 - 1998
     (1992 - 1998)

Royal Air Force
Experimental Test Pilot
From 1992 - 1993 selected to attend the French Test Pilot School – EPNER. Following EPNER, appointed as the Certification Flight Commander on the Rotary Wing Test Squadron, Boscombe Down, from 1993 - 1998. A requirement of the test pilot role was to assess aircraft during development or modification, or for a given role. Therefore test flew as P1 on the EH101/Merlin Mk3, Chinook Mk2, Puma HC1, Lynx Mk1/7/8/9, MD500, MD900, SA365N & N2, Aerospatiale AS355 & AS350B, Sea King M3/3A/4/7, Agusta 109A, Bell 412, Bell 206, Skyship 600 airship. In addition, flew another 5 airship types as part of an MOD feasibility study and flew simulator trials on new systems under development. Typically flew about 25 types a year along with a variety of training and research simulators.
In addition to the management & conduct of flight trials, the role involved liaison with the MOD Operational Requirements staff & MOD Project Offices at Abbey Wood.

     (1979 - 1992)

Operational RAF Pilot
RAF pilot training qualified as P1/Captain on: Bulldog TMk1, Jet Provost TMk5, Hawk TMk1, Gazelle & Wessex. Flew three operational tours on the Puma, HC1 & Lynx AH1/7.