Yoshaki, here is a first draft, the Form is your Inspectors form with a Find an Inspector Combo box.
It has a Main Tab for the Audit itself, where you can select a flight and a Refuelling operation and enter the audit details.
You then have a Flights tab showing all flights, it could just show the detalis of the Flight chosen in the Audit, it has a Combo to select the Aircraft.
You have a Refuelling Operations Tab showing all refuelling ops, as before it could just show the details of the Audited operation.
Finally you have an All aircraft Tab showing a list of Aircraft.
I would suggets that you have a separate Table for the Organisations on the Refuelling Operation so that they can also be selected with a Combo.
I have made one change to your relationships, the Aircraft Table is now related via an AircrafttypeID field, as it should be related using an ID and not text, like all your other tables are.
I will leave any formatting to you.