22.214.171.124 Dissimilar metals.
Unless protected against electrolytic corrosion, dissimilar metals shall
not be used in intimate contact with each other. Dissimilar metals are defined in MIL-STD-889.
The vehicle shall be constructed so that parts shall not work loose
Design and Construction
in service, and shall withstand the loads, shocks, vibrations and other conditions incident to operation,
shipping, and storage with minimum loss of time for maintenance, repair, and servicing. The design of
the vehicle shall ensure safe, efficient, and economical operation. All assemblies, controls, and installed
equipment shall be located so there will be no adverse interference with each other or with operations and
shall be readily accessible for maintenance, operation, removal, and replacement. The vehicle shall
comply with MIL-STD-1472, Federal Safety Regulations 49CFR571 and 49CFR393.
The vehicle, including all components, shall have a Mean-Time-Between-
Failures (MTBF) of not less than 250 hours demonstrated at an 0.9 confidence level. The vehicle shall be
designed for a life expectancy of at least 14 years.
The vehicle shall be designed and constructed to provide the following:
A minimum number of parts consistent with the performance required herein.
A minimum amount of time for assembling, disassembling, locating trouble sources and
maintaining the vehicle. Where practical, components shall be located for rapid
inspection and recognition of potential failure.
Ease of adjusting, servicing and replacing parts and components.
Use of readily available standard tools and equipment for maintenance.
Maintenance with a minimum number of tools.
Maximum repair time, excluding time to troubleshoot, of no greater than eight hours.
Maximum total downtime to perform all daily scheduled maintenance and servicing
tasks of no greater than 15 minutes.
The vehicle shall be designed so that one mechanic, using common hand tools, can perform the following
maintenance operations within the time specified:
Remove, replace and adjust all engine driven belts - 3/4 hour.
Remove and replace alternator - 1/2 hour.
Remove and replace all filters, screens and strainers in all hydraulic systems -
Remove and replace engine coolant system hoses - 1/2 hour.
Drain engine lubricating oil, remove and replace oil filter element (s) and refill
crankcase - one hour.
Remove and replace fuel filter element (s) - 1/2 hour.
Disconnect battery cables, remove and replace batteries and reconnect battery
cables - 1/2 hour,
Drain torque converter oil and transmission oil, remove and replace all filter
elements and strainers and refill converter and transmission - one hour,