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.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28

MIL-HDBK-6870B

AMS-STD-2154      Inspection, Ultrasonic, Wrought Metals, Process For (DoD Adopted)

(Copies of these documents are available from www.sae.org or SAE World Headquarters, 400

Commonwealth Dr., Warrendale PA  15096-0001.)

3.   DEFINITIONS

3.1    Inspector certification.

A  written  statement  from  the  certifying  agency  verifying  that  an  individual  inspector  has  met applicable  requirements.     The  certifying  agency  may  be  the  employer  of  the  inspection personnel.

3.2    Classification.

Classification  refers to functional  reliability requirements  of  the  part  and implies  a  confidence level  requirement  for  NDI.    A  high-reliability  class  may  require  redundant  testing  to  assure adequate NDI confidence level.  Complex components may be divided into zones with separate classifications.

3.3    Contracting agency.

A contractor, subcontractor or Government agency procuring product or services.

3.4    Contractor.

Organization having contractual responsibility to the Government.

3.5    Final inspection.

The  last  inspection  of  a  part  or  component  usually,  just  prior  to  final  acceptance.    This inspection may occur during manufacturing or depot maintenance if the component will become uninspectable at some later stage in fabrication or assembly and is not subject to reinspection, or  if  it  is  inspected  just  after  some  processing  step  and  is  not  subject  to  reinspection  by the manufacturer after further processing.

3.6    Fracture-critical part.

A fracture-critical part is 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 criticality  of  the  component  (reference  MIL-STD-1530,  MIL-STD-3024,  MIL-HDBK-516  and JSSG 2006).

3.7    Fracture-critical traceable part.

A fracture-critical traceable part  is a safety-of-flight  structural component  that  is either  single- load path or sized by durability or damage tolerance requirements.

3.8    Maintenance-critical part.

A maintenance-critical part is 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.

4