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|  MIL-C-52980B
3.7.1 Safety. All rotating or reciprocating parts and other parts subject to high operation
temperatures that are of such a nature or are so located as to be a hazard to operating personnel,
shall be guarded or insulated to the extent necessary to eliminate the hazard. Protective devices
shall not impair the operating functions. The compressors shall conform to the applicable
requirements of ANSI B19.1a.
3.7.2 Human factors engineering. The compressor shall conform to accepted human factors
engineering design criteria as described in MIL-STD-1472. Special control/display integration
(5.1), visual displays (5.2), controls (5.4), labeling (5.5), design for maintainability (5.9), and
hazards and safety (5.13) of MIL-STD-1472, as applicable.
3.7.3 Noise limits. The noise produced by the compressors shall conform to MIL-STD-1474
requirements, with the exception of MIL-STD-1474, 5.2, 5.3, and 5.4, when tested in accordance
with 4.5.2.11. The provisions of MIL-STD-1474, 4.3 and 4.4 shall be provided if and only if
MIL-STD-1474, 5.1.1.2 procedures have been pursued and documented to the satisfaction of the
procuring activity and written permission to exceed the 85 dB(A) limit is obtained from the
procuring activity. Hazard signs shall conform to MIL-STD-1474, 4.3, except the sign will state
'HEARING PROTECTION REQUIRED WITHIN (specify) FEET". The sign shall be readable
at the distance indicated on the sign. For the purpose of the noise measurement, the operator
position is defined as 1.5 feet from the compressor.
3.8 Endurance and maintainability.
3.8.1 Endurance. The compressor shall produce rated capacity at rated pressure for
500 hours in operating periods of not less than 8 hours. Operating periods of not less than
4 hours during high and low temperature tests may be counted (see 4.5.2.6, 4.5.2.7, 4.5.2.18
and 4.5.2.19).
3.8.2 Maintainability. The compressor shall operate as specified herein without repair or
maintenance other than the contractor's recommended normal schedule adjustments and
servicing, as established by a maintenance schedule prepared and submitted by the contractor
prior to test. All major assemblies and installed attachments shall be accessible for maintenance
repair and replacement without removal of other major assemblies and installed attachments not
normally removed. Design for maintainability shall comply with 3.7.2. Cover plates which must
be removed for component adjustment shall be equipped with quick-disconnect fastenings.
Cover plated shall be labeled with nomenclature for items accessible through them in accordance
with MIL-STD-1472, 5.9.9.3 (see 3.7.2). All fasteners shall be of corrosion-resistance material
or shall be tested to be corrosion resistant. All screw threads shall be in accordance with
FED-STD-H28. Maximum use shall be made of interchangeable hardware and fastening
devices. Means for drainage of lubricants, fuel, and condensate traps shall be in an accessible
location and shall drain without splashing on any component or on operating personnel. The
drain outlets shall be so located to facilitate complete drainage into a suitable container. Each
maintenance, assembly or disassembly operation performed as a result of testing shall be
accomplished by not more than two men using common tools and specified tools furnished with
the compressor.
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