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Providing value driven aircraft and helicopter solutions through experience and innovation.

The Inter-Tec Group is a professional, experienced design consultancy offering a commercially focused and no-nonsense approach to finding and delivery of practical, affordable EASA and UK CAA Part 21J Design Organisation (DOA) certifiable technical solutions to the critical issues affecting our Original Equipment Manufacturers (OEM), aircraft operators and Maintenance and also Repair and Overhaul (MRO) customers across the aviation sector. Filling the missing piece in our customer’s puzzle, by providing fully approved, manufactured and installed modifications and repairs.

Our History




Established in 1997 by Managing Director, Fred Gorrie, Inter-Tec Aero Group started as a privately owned one-person consultancy, Inter-Tec Services Ltd, located in a small office space in Kilmarnock. In the early years Inter-Tec specialised in the provision of stress analysis consultancy services to a number of UK based customers including aircraft and equipment OEM’s and Tier suppliers. Following a period of steady growth, expanding our customer base to Western Europe, this increase in experience, and resultant demand for the skills and service offering of Inter-Tec, prompted the need for the expansion in both the team size and scope of capability and capacity.



AS9100 Rev D Approval

From establishment as a multi-person design consultancy, in 2005 Inter-Tec gained AS/EN 9100 approval, one of the first SME consultancies in the UK to achieve this.


EASA Part 21J
DOA approval

EASA Part 21 subpart J

In 2012, following a period of market analysis of customer needs and expectations, Inter-Tec obtained EASA Part 21J Design Organisation Approval (DOA), further enhancing our service offering and adding a complete package of design, analysis and certification approval services. The DOA, covering the scope of minor changes and repairs to both small and large helicopters and aeroplanes, established our position within the global market.


New Office

Inter tec office Prestwick

In 2013, the company moved to our current UK based office at the Glasgow Prestwick International Airport Aerospace Park, establishing a strategic position within the west coast of Scotland’s aerospace hub centre.


AS9100 Rev D

AS9100 Rev D

In 2016 we increased our Approval from Rev C to Rev D to enhance our quality management system process approach and ensure better integration with other business activities, including our Part 21J DOA QMS.


Extension to Scope

European Technical Standards Order

In 2016, we added the certification approval for minor structural repairs to aircraft Auxiliary Power Units (APU).


Extension to Scope
Nacelle Repairs

European Technical Standards Order

In 2017, we added a further extension to our Part 21J DOA scope to include the scope for minor and major structural repairs to aircraft engine nacelles.


Extension to Scope
ETS0 C127b, C39c

European Technical Standards Order

In 2021, Inter-Tec further expanded our scope of approval to include European Technical Standards Order (ETSO) authorisation of the C127b approval of aircraft economy seats.


UK CAA DOA Approval

UK CAA DOA Approval

In 2021, Inter-Tec Services Ltd obtained UK CAA Part 21J DOA approval, concurrent and supplemental to our EASA DOA approval, serving a wider of scope of certification support to both our UK and global customers. Furthermore, we delivered our 1000th DOA approved design solution.


Formation of
Inter-Tec Aero Ltd

European Union EU flag

In 2021, Inter-Tec expanded through formation of the Inter-Tec Aero Group, opening headquarters in Sligo, Republic of Ireland, our new principal site of business for EASA approvals. In line with this, Inter-Tec Aero Ltd was formed and secured EASA Part 21J Design Organisation Approval (DOA), replicating the core capabilities and certification services provided up to this point by Inter-Tec Services.



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