A034 High Impact Shock Test Procedures

BLOCK 1-DATA ITEM NO.: A034
BLOCK 2-DATA ITEM TITLE: HIGH-IMPACT SHOCK TEST PROCEDURES

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BLOCK 3-DATA DESCRIPTION:

  1. General Requirements – High-Impact Shock Test Procedures shall include the following:
    1. General Test Procedure/Equipment Identification Information. 
      Each test procedure shall contain the following equipment identification information:

      1. Item.
      2. Type.
      3. Nomenclature.
      4. Rating.
      5. Service.
      6. Military specification and technical manual numbers.
      7. Manufacturer name and address.
      8. Model number and serial number, if applicable.
      9. Size or capacity, if applicable.
      10. Drawing or plan numbers (sectional assembly and outline. revision and date).
      11. Approximate overall size of equipment:
        1. Length.
        2. Height.
        3. Width.
        4. Diameter.
        5. Weight (wet, dry, and total weight including test fixture, wet and dry).
        6. Height of center-of-gravity above base of equipment.
      12. Contract and purchase order number.
      13. Requirements of MIL-S-901:
        1. Test category.
        2. Grade.
        3. Equipment class.
        4. Shock test type.
        5. Mounting location.
      14. Mounting aboard ship represented during shock test.
        1. Plane.
        2. Orientation.
      15. Hold-down fasteners or locating devices used for attachment of items to their foundation or test fixture during shock tests:
        1. Grade.
        2. Size.
        3. Material.
        4. Specifications.
      16. Hold-down bolt torque.
      17. Description of resilient mounts, if used:
        1. Size.
        2. Type.
        3. Location.
        4. Specification.
      18. Major components and attached items in test (name, identification, manufacturer).
      19. Test laboratory and address.
      20. Test instrumentation and monitoring equipment, if any.
      21. Purpose and objectives of tests to be conducted.
      22. The activity whose representative(s) will witness both the shock test and the post-shock test inspection and functional testing (see 4.4 of MIL-S-901).
      23. Alternative representative(s), such as PMR, project engineer, etc., who may witness tests in the absence of the specified witness above.
      24. Step-by-step test procedures and limits.
      25. Test sequence.
      26. Simulation of items during shock test.
      27. Test item operational requirements.
      28. Fixture drawings for the test fixture required for conducting heavyweight shock tests and the justification for the fixture meeting the requirements of MIL-S-901.
      29. Requirements, if any, for on-site evaluation of test instrumentation results. All test instrumentation data evaluations needed to show compliance with acceptance criteria (including criteria, if any, regarding momentary malfunctions) shall be identified for on-site performance to ensure recognition of discrepant conditions before proceeding with additional shock blows or shots.
    2. Shock Test Acceptance Criteria. Include grade A shock test acceptance criteria if such is not specified by applicable acquisition documents. Include the following minimum acceptable performance parameters:
      1. Alignment.
      2. Dielectric strength.
      3. Pressure-tight integrity.
      4. Deformation.
      5. Clearances.
      6. Extent of momentary malfunction, if permitted.
      7. Degree of permanent functional impairment allowed.
  2. Post-Shock Test Functional Procedures. – Post-Shock Functional Test Procedures shall include the following in separate sections for each component, as applicable:
    1. Functional tests shall include the following:
      1. Input-output of component or equipment.
      2. Operating temperatures (bearing and coil winding).
      3. Cyclic operations to determine compliance with design specifications.
    2. Hydrostatic tests shall include the following:
      1. Hydraulic, pneumatic, and fluid systems equipment.
      2. Demonstration of strength.
      3. Leakage.
    3. Electrical tests shall include the following:
      1. Insulation breakdown (shorts).
      2. Electrical continuity.
    4. Comparison with Operational Requirements. Define the procedures for reporting the results of the comparison of the specified test item operational requirements containedin the test item operational requirements identified in the test procedure.
    5. Post-Shock Inspection Procedures and Criteria. Include the inspection procedures in separate sections for each component and determine the following:
      1. Breakage.
      2. Deformation.
      3. Yielding.
      4. Misalignment.
      5. Unbalance.
      6. Cracks (dye penetrant, radiographic, or magnetic particle).
      7. Separation.
      8. Critical tolerance clearances.
      9. Bolting torques.
    6. Pre-Shock Test vs. Post-Shock Test Configuration Comparison. Define the procedures for reporting the results of the comparison between pre-shock tested component configuration and post-shock tested component configuration.

BLOCK 4-REVIEW REQ.:

Government approval required for the test procedure. Allow 45 days for Government review and comment.

BLOCK 5-SUBMITTAL SCHEDULE:

NLT 120 DPT each scheduled test; R/ASR 20 DARC. Revisions shall incorporate Government comments.

Reference: DRL A034 21 July 2000