FUZE AND FUZE COMPONENTS, ENVIRONMENTAL …

1 MIL-STD-331C 5 JANUARY 2005 NOT MEASUREMENT SENSITIVE SUPERSEDING MIL-STD-331B 1 DECEMBER 1989 DEPARTMENT OF DEFENSE TEST METHOD STANDARD fuze AND fuze COMPONENTS, ENVIRONMENTAL AND PERFORMANCE tests FOR AMSC N/A FSG 13GP DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. MIL-STD-331C FOREWORD 1. This standard is approved for use by all Departments and Agencies of the Department of Defense. 2. MIL-STD-331C supersedes MIL-STD-331B, dated 1 December 1989, including all change notices. It has been prepared in accordance with MIL-STD-962C and complies with DoD policy for greater use of commercial products and practices. 3. MIL-STD-331 is a test method type standard. Its scope has evolved over the years reflecting increased standardization of ENVIRONMENTAL and performance tests among the services and improvements in fuze design, test technology and safety.

2 MIL-STD-331B was largely an editorial effort to consolidate test methods and restructure the standard. Attention is directed to the test grouping and use of standard, alternate and optional test methods described in sections and respectively. 4. In the process of reorganization, tests were renumbered. Where old test numbers are still referenced in fuze specifications and test plans, Table I is included to show the correspondence between prior test numbers and the new numbers. 5. Design agencies are cautioned that the existence of this standard does not relieve them of the responsibility to define the environments the fuze will be exposed to during its life cycle. This definition is essential for proper test selection and the identification of any required test deviation. Specification of the test method alone in a test directive may not adequately define the conditions in which a test is conducted.

3 Many test methods in this standard include parameters or options which permit tailoring to specific fuze designs, environments and uses. Table II results from the concern for properly invoking the use of test methods. The use of Table II and careful review of the entire test method is strongly encouraged when preparing development or production specifications and test plans. 6. Paragraph numbers in each test have been modified to include the test method number. Although this makes the numbers longer, each paragraph in the standard is now uniquely identified. This is intended to reduce confusion when referencing specific material. 7. MIL-STD-331C includes three new tests (D6, D7 and D8) and two revised tests ( and ). Test D6, Brush Impact No-Fire Test has been included to verify the performance of an armed anti armor munition demonstrating it will penetrate light foliage such as brush.

4 Test D7, Mortar Ammunition fuze Double Loading Test has been included to determine, in the event of double lading, whether the contour of the ogive of the projectile fuze can initiate the round dropped on it. Test D8, Progressive Arming Test has been included to determine the correlation between the position of the explosive train interrupter and the probability of explosive transfer. 8. Test , Transportation Vibration (Bare and Packaged Fuzes), replaces both tests B1 and B2. It employs the use of random vibration test techniques and can be tailored to various land, sea and air transportation scenarios. All former sinusoidal vibration test methods have been retained as alternate tests in Section and may be specified for procurement of older fuzes which cannot comply with the requirements of the random vibration test schedules.

5 9. Design agencies which frequently use other fuze and explosive component tests or variations of tests contained in this standard are requested to furnish this information to the preparing activity (see address above) for possible inclusion in MIL-STD-331. 10. Comments, suggestions, or questions on this document should be addressed to: US Army, Research, Development and Engineering Command, Armament Research, Development and Engineering Center, Attn: AMSTA-AAR-AIS-SS, Picatinny, NJ 07806-5000 or emailed to Since contact information can change, you may want to verify the ii MIL-STD-331C currency of this address information using the ASSIST Online data base at iii MIL-STD-331C CONTENTS Page Page 1 SCOPE 1 Scope 1 Safety and Suitability for Service Assessment of Fuzing Systems 1 NATO 1 STANAG 4157 1 Application 3

6 Test identification 3 Method of revision 3 Method of reference 3 2 APPLICABLE DOCUMENTS 3 Government documents 3 Specifications, standards and handbooks 3 Other Government documents, drawings and publications 4 Non-Government publications 5 Order of precedence 6 3 DEFINITIONS 6 4 GENERAL REQUIREMENTS 8 Test usage 8 Test compliance 8 Selection and specification of tests 8 Test equipment 8 Capability

7 8 Accuracy 8 Test conditions 9 Installation of test item 9 Tolerance of test conditions 9 Temperature 9 Pressure 9 Relative humidity 9 Vibration amplitude 9 Preconditioning and stabilization 9 Examination and test criteria 10 Visual examination 10 Criteria for passing tests 10 Safe 10 Operable 10 Safety condition 10 Test documentation 11 Test directive 11 iv MIL-STD-331C CONTENTS Page Page

8 Test item record 11 Condition before test 11 Condition during test 11 Condition after test 11 Test equipment 12 Test conditions 12 Test results 12 5 DETAILED REQUIREMENTS 12 Individual tests 12 Test classification 12 Group A - Mechanical Shock tests 12 Group B - Vibration tests 12 Group C - Climatic tests 12 Group D - Safety.

9 Arming and Functioning tests 13 Group E - Aircraft Munition tests 13 Group F - Electric and Magnetic Influence tests 13 Test number conversion 13 Invoking tests 13 Alternate and optional tests 13 Test parameters 13 6 NOTES 13 Background information 13 Safety 14 Short operational time 14 One-time operation 14 Test content and format 14 Purpose 14 Location 14 Safety.

10 Reliability or performance 14 Life cycle phase 14 Environment or performance measurement 14 Description 15 General 15 fuze configuration 15 Variations 15 Applicable publications 15 Test documentation 15 Criteria for passing test 15 fuze condition 15 Decision basis 15 Equipment 16 Procedure 16 v MIL-STD-331C CONTENTS Page Page