MIL-DTL-917F(SH)
3.2.3.1 Mounting of replaceable items. Items which are identified as replaceable, including individual parts
and non-repairable assemblies, shall be mounted so as to permit easy removal and replacement. Riveting and
welding shall not be employed for mounting such items. Plug-in modules shall be easily insertable into the proper
receptacles and restricted with proper orientation. No damage shall occur to items being engaged. It shall not be
necessary to unsolder wires, harness, or other items which are not to be replaced in order to gain access to terminals,
soldered connections, mounting screws, and the like, of items which are to be replaced. Connections to parts inside
a removable container shall be arranged so as to permit removal of the container without the need to thread
connection leads through the container.
3.2.3.2 Doors and covers. Hinges shall be so attached that they will not extend more than ¼ inch beyond the
outer surface of the enclosure whether or not the doors are open. Each access panel, cover, or door not designed for
complete removal, whether hinged or sliding, and exceeding 45 inches high or 24 inches wide shall be provided with
stops or positioning devices to stop the item in fully or partly opened positions as selected, and to prevent its moving
from the selected position due to gravity or ship motion. When the access panel, cover, or door is opened to its
widest position, it shall provide unimpeded access to the interior of the enclosure. Access doors or covers larger
than 4 square feet in area, or weighing more than 35 pounds designed for complete removal, shall be provided with
locating pins or other means for support and alignment during removal or replacement.
3.2.3.3 Mounting fasteners. Enclosure mounting bolts that mount the equipment to the ship shall be accessible
and removable without removing any component part other than external equipment panels.
3.2.4 Operation of controls. Operation of controls shall conform to the requirements of MIL-STD-1472.
3.2.5 Maintenance and repair. Equipment shall be designed for ease of maintenance and repair as specified
(see 6.2). Except where packaging of parts in non-repairable form is approved (see 3.2.3 and 3.13.27), equipment
shall be capable of being repaired either by replacement of defective individual electrical parts (relays,
semiconductors, switches, resistors, capacitors, and so forth) or mechanical parts (bearings, bushings, springs,
latches, and so forth) or by utilizing bulk materials (magnet wire, varnish, insulation, and so forth) commonly
available. The use of special design features that simplify maintenance and repair (for example, test jacks,
indicating type fuseholders) is encouraged. Standoff legs or other supports or guards shall be provided to protect
subassemblies and parts for maintenance and repair.
3.2.6 Fail-safe design. Unless otherwise specified (see 6.2) and to the maximum practical extent, the design of
the equipment shall be such that failure of parts or subassemblies will not result in unsafe operating conditions. In
the design of fail-safe features, consideration shall be given to their effect upon plant reliability. Fail-safe features
shall not cause undue complexity or excessive increase in size or weight.
3.2.7 Remote controls. In equipment specifications where remote controls for equipment are used, precautions
shall be taken to ensure that loss or damage to the remote control unit or its connections to the equipment shall not
cause equipment shutdown, misoperation, or loss of local control of equipment.
3.2.8 Standardization. The equipment shall be designed so that parts, subassemblies, and assemblies which
perform similar functions will be standardized and interchangeable. In selecting parts for the equipment, preference
of parts shall be as specified in 3.13.1.
3.2.9 Input power.
3.2.9.1 Alternating current (AC). Unless otherwise specified (see 6.2), AC powered equipment shall operate
satisfactorily and adhere to user equipment interface requirements in accordance with MIL-STD-1399-300.
3.2.9.2 Direct current (DC). Unless otherwise specified (see 6.2), DC powered equipment for submarines shall
operate satisfactorily and adhere to user equipment interface requirements in accordance with MIL-STD-1399-390.
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