You don't say what those other qualifications are but my guess is that you need a 'two-step' move. Either shift into something less industrial while staying in aviation, then move out into something similar but less industrial. Or else shift into something beneath your dignity as a temporary position to break the industrial link, then move up using your qualifications.
Without knowing what you had in mind its a bit hard to see the problem let alone a solution.
A couple of examples:
A former colleague quit being an avionics supervisor and joined Plessey, fixing traffic lights. Then he moved via computer programming into a Systems Analyst job.
Another guy switched into apprentice training then left aviation and became a school teacher.
In the end it depends on what you personally consider an interesting and rewarding position, but any career change is liable to be less financially rewarding initially.
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Through difficulties to the cinema