MIL-STD-1365 General Design Criteria For Handling Equipment Associated With Weapons And Related ItemsThis design standard contains the general design criteria and applicable tests for beams, bands, strongbacks, cradles, assembly stands, slings, dollies, bomb loaders, trailers and hoists used as an integral component of an ordnance handling device associated with handling weapons and related items. This standard is not intended to be used directly for acquisition of related equipment, but is to be used as the basis to prepare appropriate development specifications from which the equipment is to be designed and procured.

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MIL-STD-1365C

4.5.4 Other considerations.

4.5.4.1 Hydraulic system. Hydraulic system shall be provided with vent plugs or valves to ensure that the system is full of fluid before putting the system into operation. To vent any accumulation of trapped air in any system, accessible watertraps, filters, and low-point drainage plug(s) shall be provided. Disconnection of lines, loosening of tubing nuts, or the use of external pressure source does not constitute proper system venting.

4.5.4.2 Fail safe mechanisms. Hydraulic systems designed to handle weapons shall have "fail safe" devices such as hydraulic velocity fuses or counter-balance valves in positioning and lifting mechanisms.

4.5.4.3 Function-adjustment screws. Function-adjustment screws, if used, shall be so designed and constructed as to maintain adjustment under all the required vibration and operation. It shall be possible to adjust and lock the adjustable screws with standard tools. Positive locking means such as safety wire, lock nuts, or lock tabs shall be used.

4.5.4.4 Noise and vibration. Noise and vibration, caused by turbulence or cavitation in hydraulic equipment or by unbalanced moving parts shall be minimized. Noise and vibration transmitted from other equipment shall also be minimized by proper selection and design of mountings, couplings, and similar parts. MIL-STD-740 should be referred to for guidance when the equipment is intended for shipboard use.

4.5.4.5 Leakage. The system operating the lifting mechanism shall be designed such that internal leakage when power has been interrupted will only allow 0.5 inch/hour maximum movement of the rated load.

4.6 Pneumatic equipment.

4.6.1 General. Pneumatic components shall be designed in accordance with commercial practices.

4.6.2 Pneumatic system lubrication. The lubricant for pneumatic systems shall be suitable for the application and environment in which it is to be used. Grease conforming to NATO Code Number G 392 is preferred, but an equivalent commercial product is acceptable. No other lubricant or organic compound may be used in the pneumatic system or in any application where contamination of the pneumatic system is possible.

4.7 Electrical systems.

4.7.1 General. Unless otherwise specified herein, or by the applicable development specification or procuring activity (see 6.2), electrical systems shall be designed in accordance with NFPA No. 70.

4.7.2 Power requirements. Both shipboard and shore-based equipment shall operate on Type I, 440-volt,

three-phase, 60-Hz power in accordance with MIL-STD-1399-300. If necessary, the alternate voltage of 115 VAC, single phase, may be used.

4.7.3 Main power switch. A main power switch shall be provided which opens and closes all input power leads to the equipment. The main power input to the equipment shall be provided with suitable fuses or circuit breakers

on the equipment side of the main power switch, to protect the power source from short-circuits or overloads within the equipment.

4.7.4 Overload protection. Protective devices shall be provided to prevent damage to the equipment caused by overload conditions and subsequent excessive heating of circuit components. Parts which are likely to carry any overload because of circuit malfunction, poor adjustment, or component casualty shall be capable of sustaining such an overload. Where this is impractical, circuit breakers, relays, fuses, or other devices shall be included to protect the affected parts. A minimum number of secondary protective devices consistent with good engineering and safety practices shall be used.

4.7.4.1 Circuit breakers. Where circuit breakers are used, they shall be located in one main panel and be easily accessible to the operator.

4.7.4.2 Fuses. Fuses shall be easily replaceable. Fuse ratings shall correspond closely to the maximum current rating of the parts they protect. Fuses shall open the circuit under short-circuit or overload conditions without emitting flame, molten metal, or vapor. One replacement fuse of each type and rating used shall be attached to the equipment in a convenient location.