g'day invisible man, i think an answer could be job creation and empire building in these dept's ,surely if you have too change a wheel or brake pack they cant invent many different ways to do it to try and save dollars, they probably want you to only change that wheel the landing before it fails, then they would save money and probably get a (your) pay rise, another secretary, and the empire gets bigger!
this is a great site with great topics, you would think caa, casa, faa etc would monitor this site and learn what going on in the real world.
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dont look at me,i didn't signe it out,i'm just an innocent bystander