MIL-HDBK-6870B
3.9 Mission-critical part.
A mission-critical part is a structural component in which damage or failure could result in the inability to meet critical mission requirements or could result in a significant increase in vulnerability.
3.10 Material Review Board (MRB).
A government approved review of discrepant materials by authorized contractor Engineering and Quality Assurance personnel to determine whether material or component can be returned to an acceptable state.
3.11 Nondestructive inspection (NDI).
NDI is the inspection of a structure or component in any manner that will not impair its future usefulness. The purpose of NDI may be to detect flaws at or beneath the external surface of a part, measure geometric characteristics, determine material structure or composition, or it may characterize physical, electrical, or thermal properties without causing changes in the part. The five primary methods of NDI are liquid penetrant, magnetic particle, eddy current, ultrasonic and radiography. Other methods include but are not limited to shearography and thermography.
3.12 Nondestructive inspection (NDI) procedure.
NDI procedures are contained in specifications that provide detailed information on "how-to" perform a particular NDI method (see 5.3.4).
3.12.1 General NDI procedure.
General NDI procedures are non-part specific nondestructive inspection procedures applicable to common product forms such as plates, composite laminates and bonded assemblies, bar stock, fasteners and tubular products, etc. General NDI procedures may also include procedures that describe standardization and inspection processes for common inspection methods.
3.12.2 Part specific NDI procedures.
Specific NDI procedures are procedures for inspection of a part or component, inspection of designated components, which incorporates all processing criteria and may be used in lieu of company process specifications.
3.13 NDI facility.
NDI facilities are organizations responsible to the System Program Offices (SPOs), contractor, and/or the subcontractor for nondestructive inspection services.
3.14 NDI Program Plan.
Document that defines the approach for implementation of nondestructive inspection processes during design, engineering development, production, and sustainment (i.e., in-service operation).
3.15 NDI process specification.
NDI process specifications define the nondestructive testing requirements for equipment, reference standards, materials, personnel, etc., for a particular NDI method or for the testing of a particular product.
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