We have a lot of requests along the same lines, problem being airside passes. Have you tried any overhaul facilities, R-R at Derby or GE at Llantrisant. Another problem, is if they ain't broke we don't fix em. An overhaul shop will be able to show him round all parts of the engines and stages of maintenance. If the civvies can't help ask the RAF. Tornado engines are overhauled at Woodhall Spa in Lincs, or they used to be! Hope this helps.
Also which part of the contry is he in ??