JOTP-011
5 December 2014
APPENDIX A. BACKGROUND/RATIONALE
ANNEX 1. ENVIRONMENTAL TESTS
will be subject to wave action in high seas that may directly impart shock loadings (`sea
slamming') on the munitions in their launcher. Munitions located within the ship's structure, such
as in a vertical launch silo, are better protected and less likely to experience these shocks. Both
configurations are likely to receive accelerations from sea slamming in high seas although sea
slamming is unlikely to be a consideration for submarines operating below the surface. Due to the
difficulty of replicating this environment, sea slamming is addressed with a structural analysis.
Tailoring of the vibration and shock environment based on measured data is recommended
although MIL-STD-810, Method 514, Annex D gives generic default vibration spectra. No life
equivalence is assigned to this test but a duration of one hour per axis has been applied historically.
MIL-STD-810, Method 514 does not contain a default test severity for submarines and is not
normally required due to the benign nature of the environment. UNDEX shock is covered in
paragraph A.1-3.1.2.2.2.
A.1-3.2.3 Adjacent Munition Firing Shocks (Appendix C, Annex 2, Paragraph C.2-5.1.6).
When munitions are fired, they release energy (thermal, acoustic and shock) into the surrounding
environment. Consideration should be given to the effects of this energy impinging upon adjacent
munitions, particularly launch shocks in multi-munition launcher/pod/silo configurations. Launch
shock levels should be derived from data measured from adjacent munitions, applying the worst
measured shocks using shock response spectra (MIL-STD-810 Method 516) and/or time waveform
replication methods. The number of shocks to be applied should be based upon the frequency of
the launch environment and quantity of adjacent munitions.
A.1-3.2.4 Tactical Drop/Impact (Appendix C, Annex 2, Paragraph C.2-6).
The Tactical Drop test simulates accidental drops encountered during handling of munitions when
subjected to maintenance and/or (un)loading on the launch platform. For the latter, the munition
will be in it launch configuration such as bare munition or canistered as described in paragraph 6.4
of the main text. The drop heights used are tailored according to the LCEP, but it is recommended
that these should be no less than 1.5 m for munitions that can be readily manhandled without lifting
equipment and tailored for those that cannot. The munition should remain safe to fire after
dropping. It is not expected that the munition would be dropped more than once during its service
life so only one drop test is considered necessary per orientation. Drop heights may be tailored
taking due account of the fragility of the munition, with the tailoring rationale being documented
in the S3 Safety Data Package; and the reduced drop height limitation documented in the Field
Maintenance/Technical Manuals to require removal of the munition from service if dropped higher
than the test heights.
A.1-19
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