4.2.1

The supplier qualification, procurement documentation, receiving inspection, and testing requirements are defined for three fastener criticality categories (herein referred to as control levels).

4.2.2

The following criteria shall be used to identify the applicable quality control requirements found herein:

4.2.2.1

Control Level I (hereafter referred to as Level I): Fasteners whose failure would result in a catastrophic hazard or when classified per NASA-STD-5019, Fracture Control Requirements for Spaceflight Hardware, as Fracture Critical or Non-Fracture Critical (NFC)-Low Risk.

4.2.2.2

Control Level II (hereafter referred to as Level II): Fasteners whose failure would result in a critical hazard or when classified per NASA-STD-5019 as NFC-Fail Safe.

4.2.2.3

Control Level III (hereafter referred to as Level III): Fasteners whose failure would not result in a critical or catastrophic hazard or when classified per NASA-STD-5019, as NFC-Contained or NFC-Low Released Mass.