Required Inspection Item (RII)

"RII (Required Inspection Items) - is defined as a designation of the items of maintenance and alteration that must be inspected (required inspections) including at least those that could result in a failure, malfunction, or defect endangering the safe operation of the aircraft, if not performed properly or if improper parts or materials are used.

Prior to operation of a new aircraft type the operator’s management will assemble a list of items that they feel meets the definition of RII. It includes mostly the systems or subsystems broken out by ATA category. Windows, flight controls, landing gear, engines, and propellers are good examples of what make the list. In selecting these items consider the key elements of each system as a critical point of control. These elements are defined in the method described in RII procedures. "