Environmental Control Systems

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Why Choose Us?

STC Twenty One Ltd has extensive experience in all aircraft types (fixed wing and rotorcraft) for environmental control systems.

Services & Approvals
Environmental Control Systems STC Twenty One Why Choose Us

Services & Approvals

In support of our wide ranging design capability, we design and certify services consisting of : Bleed Air, Air Conditioning & Pressurisation, Ice Protection, Water & Waste and Oxygen Systems.

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Environmental Control Systems STC Twenty One Services

Speak To The Team

Our EASA approved CVE’s have over 80 years combined experience in this sector.


Anthony Pimblott

Senior Design / Certification Engineer & Structures / Interiors CVE

EASA Approved Design Organisation

STC Twenty One

All Aircraft modifications and Aircraft repairs are managed by our EASA approved Design Office represented by STC Twenty One (EASA DOA.21J.198).

What We Offer


STC Twenty One Limited holds a Part 21 Subpart J DOA enabling it to certify EASA approved STCs and Major Repairs. Additionally, where a design change or repair is classified as minor, STC Twenty One Limited is authorised to approve them under the DOA using approval reference EASA.21J.198.

Our employees are spread across our Avionics, Mechanical, Quality and Commercial Teams with a high level of experience and certification enabling the company to perform specialised services on engines and aircraft. Read more about our Services.

Environmental Control Systems

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+44 (0) 1332 576830

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