Aerospace Engineering Services UK

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In the mean time you can continue to browse our services below…

Structural Modifications

STC Twenty One, your trusted partner in aviation engineering, is dedicated to elevating safety and performance, offering a pathway to aviation's future with expertise and innovation.

Electrical Modifications

Our electrical systems services prioritise flight comfort, control and safety, offering meticulous scrutiny and assessment of everything from in-flight environment to fire protection systems.

Avionics Modifications

Digital flight control systems are the cornerstone of precision, handling autopilot, altitude control and more to ensure a safe journey. Communication, electrical power, recording systems and navigation play vital roles in maintaining aircraft performance, safety and efficiency.

Environmental Control Systems (ECS) Modifications

The air conditioning and pressurisation system maintains comfort, ice and rain protection systems prevent ice accumulation, oxygen systems ensure safety, and the water and waste system promotes cleanliness and passenger comfort.

Cabin Related Modifications

The passenger compartment prioritises comfort, convenience and safety, complemented by fire protection, cabin enhancements, avionics support in cargo compartments and essential placards and markings.

Approval of Flight Conditions & Permit to Fly

A Permit to Fly is issued when the certificate of airworthiness is temporarily invalid, or when it cannot be granted, ensuring the aircraft is capable of safe flight with specified conditions.