MIL-HDBK-6870 Nondestructive Inspection Program Requirements for Aircraft and Missile Materials and PartsThis handbook provides guidance to government personnel and contractors for defining the requirements for establishing an acceptable Nondestructive Inspection NDI program for the development, production, and sustainment phases of DoD aircraft and missile structural components when directly referenced in the item specification contract or order. This handbook is for guidance only and cannot be cited as a requirement.

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MIL-HDBK-6870B

k. Assessment and documentation of sustainment NDI capability.

l. Development of NDI methods and procedures to support test articles.

m. Qualification of new technologies for use during production or component/aircraft testing or during the service life of the system.

n. Qualification of NDI methods adapted for the purpose of insitu structural damage sensing.

4.2.4 Coordination.

This plan should be coordinated with the contractor and customer Aircraft Structural Integrity

Plan (ASIP) managers and the NDI Requirements Review Board (NDIRRB) when MIL-STD-

1530 is a contractual requirement or with the contractor, customer Propulsion Integrity Plan

(PSIP) managers and NDIRRB when MIL-STD-3024 is invoked.

4.3 Parts classification.

4.3.1 Structural parts classification.

The contractor should classify all structural components according to the structural integrity requirements of MIL-STD-1530. Complex components may be divided into zones and a separate classification or quality grade assigned to each zone in accordance with the reliability requirements. Classification should be noted on the drawing of the component or other released engineering data. Components should be classified as follows:

Fracture-Critical

A safety-of-flight structural component that is not single load

path nor sized by durability or damage tolerance requirements but requires special emphasis due to the

criticality of the component.

Fracture-Critical Traceable

A safety-of-flight structural component that is either single load-path or sized by durability or damage tolerance requirements the single failure of which would result in the loss of an aircraft or missile system.

Mission-Critical

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.

Maintenance-Critical

A structural component whose failure will not cause a safety-of-flight condition but is sized by durability requirements and would not be economical to repair or replace.