Very thorough. SOPs are heavily involved as well as your pre-accident plan. They will expect you to demonstrate a knowledge of CAFRS. I had my 15Ps build a binder based on the checklist so that as the inspector went down the list, they could answer the question in order from the binder or it would direct them to how to walk the inspector through our processes.
If you follow the ARMS checklist and have knowledgable Soldiers to answer their questions you should be successful. If you can address every question/item with a valid answer IAW the regulations or current message, etc. you will sail through any inspection. The inspectors are not "out to get" anyone. They are very experienced professionals that are checking on the status of the organizations in the Army.
They are going to dig into your records, so make sure your aircrews are current on all checks, APARTs and physicals. The last ARMS I was in they dug deep into flight ops. Best thing I can say is that first impressions are everything. They are going to follow the ARMS checklist, but the less they find wrong, the less they will dig further. Your unit should have already been following that checklist
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