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| MIL-T-18232B(AS)
3.1.21
MAINTENANCE AND REPAIR. - The design shall provide for maximum
ease or removal and replacement of wings, tail surfaces, all
parts of the propulsion units, electrical and electronic equipment, control sur-
faces, control cables, and all other parts that require periodic or frequent re-
placement, or that may, by their nature or location, be subject to occasional
damage. Special consideration shall be given to those parts which must be in-
stalled or adjusted during the final preparation for launching to assure that the
installation/adjustment can be accomplished with a minimum number of tool types.
Access shall be provided to fuel and oil tanks for inspection and maintenance
without removing the tanks from the target. All engine installations shall be
so designed that the engine, including accessories, may be rapidly removed and
replaced with a minimum disturbance of fittings and connections. Connections for
controls, instrument lines, hydraulic lines, etc., at major disassembly and adjust-
ment points shall be designed to prevent the possibility of reversing the action
by reversing attachments.
3.1.21.1
ACCESSIBILITY OF ELECTRICAL AND ELECTRONIC EQUIPMENT. - Accessib-
ility shall be provided in electrical and electronic system
installations for pre-flight inspections and routine preventative maintenance
checks. The electronic equipment installation shall be so designed that those
equipment adjustments, test points, inspection points, destructors, equipment fuses,
circuit breakers, meters, etc., which are necessary for determining proper opera-
tion of electronic equipment, shall be readily accessible when all components
thereof are installed and operating. Where space limitations preclude full com-
pliance with the intent of the foregoing accessibility requirements, remote test
and check points, inspection doors, hinged shelves, and other devices as necessary
to facilitate inspection, test, removal and reinstallation of all installed
electronic equipment shall be provided.
3.1.12.2
ACCESSIBILITY OF PROPULSION SYSTEM COMPONENTS. - All propulsion
system components such as spark plugs, magnetos, generators,
distributors, reciprocating engine superchargers not integral with engine, car-
buretors, pumps} main propulsion system control, etc., shall be readily accessible
for inspection, maintenance and easy replacement without removal of target parts
other than cowling. The arrangement shall permit replacement of sparkplugs and
drainage of oil without removal of the cowl if practicable.
ACCESS AND INSPECTION DOORS. - Access doors, removable sections,
3.1.21.3
or equivalent, shall be provided for inspection, lubrication,
servicing of engine and accessories, drainage, removal of corrosion deposits,
adjustment, refinishing, and replacement of parts as required. Doors shall furnish
an adequate view of the parts to be inspected and provide ample access to parts
involved to permit disconnection and removal. of a part without having to remove
other parts or units not affected. Doors shall be externally smooth, readily
opened, and securely closed by approved type fasteners. Doors shall be so
designed that air blast cannot get under the edges and tear them off. Hinged
doors shall be secured in the open position for maintenance use. Doors, removable
sections, or similar parts, shall be made load-carrying wherever practicable if
significant weight savings can be accomplished thereby. When such doors are
subject to extreme temperature variations, such as jet-engine access doors or
panels, in which the resultant thermal distortion will make assembly difficult,
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