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MIL-G-24477(SHIPS)
APPENDIX
30.4.2.6 Damage that brings about (until repairs are made) a requirement for slight
to moderate increase of manual effort, maintenance, or attention on the part of equipment
operators in order to maintain the operating mode or the machinery space environment may
be permissible, when specifically agreed to by NAVSEC.
30.5 Design.
30.5.1 The generator set hold down bolt holes provided for securing equipment to the
ship's foundation shall be designed for use with nonfitted bolts on one side and fitted
bolts on the other.  Maximum clearance between bolt holes and bolts shall not exceed the
following:
Nominal bolt diameter
Maximum diameter of hole
3/4 inch or smaller
Nominal bolt diameter plUS 1/37 inch
Nominal bolt diameter plus 1/16 inch
Larger than 3/4 inch
30.5.2 When high yield strength materials (materials with yield strength of 75,009
p.s.i. or more) are used, by reason of choice or requirement, to meet design stress levels,
or to satisfy resistance to shock, or both, HY-80, or HY-100 in, accordance with MIL-S-21952,
MIL-S-22664, MIL-S-22958, MIL-S-23008 or MIL-S-23009, as applicable, shall be used.
40.
QUALITY ASSURANCE PROVISIONS
40.1 General inspection.  Complete generator sets and detached accessories shall be
subjected to and SUCcessfully pass shock tests.
40.2 Test requirements.
40.2.1 All shock tests shall be conducted in accordance with the grade A machinery
requirements and type A tests of MIL-S-901 and as follows:
The generator set package (prime mover, generator, and all attached accessories)
(a)
and any detached accessories needed to control and operate the set shall be
shock tested as a principal unit if the weight size and arrangement limita-
tions are not exceeded.  Detached accessories not tested with the generator
set package shall be individually tested using the applicable shock testing
machine referenced in MIL-S-901 and in accordance with the individual equip-
ment specification (for example, MIL-R-2729 - Regulator Sets, Voltage).
Assemblies or sub-assemblies comprising the equipment to be shock tested shall
(b)
be those actually made for and furnished under the present contract.
All assemblies and subassemblies comprising the equipment furnished for shock
(c)
tests shall comply with individual equipment specification requirements.
All required performance tests shall have been satisfactorily completed
prior to shock testing.
The manufacturer shall carefully inspect equipment which will be shock tested
(d)
in order to detect any flaws or undesirable conditions that might contribute
to shock test damage,
or be mistaken for shock damage during the post-test
inspection.
All running clearances, alignments, runouts, and mechanism set points -/ that
4
(e)
are normally established within the equipment and its ancillary devices by
the contractor shall be properly established in the equipment before shock
tests, even though it may be the contractor's usual practice to establish
certain of these settings after installation of the equipment onboard ship.
If the contractor desires, setpoints may be established by setting or adjust-
ing the device in question in such a manner that the correct setpoints are
theoretically achieved (that is achieved without conducting actual tests).
Request for exceptions to 40.2.1(c) requirements will be considered on a case basis by
NAVSEC.
For purposes of this appendix "damage" is defined as any permanent change of the status
or condition of any equipment that results from shock testing.
"Setpoints" define the input-output relationships of any mechanisms or device associated
with the equipment to be shock tested.  For instance, the setpoint or an overspeed
tripping device could be "actuation (output) at 19,700 r.p.m. (inPut). "
37

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