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MlL-T- 83808
el structu res. Pretreat and prime all internal surfaces prior to assembly. Pretreat
c.
and prime interior panel skin and faying surfaces prior to assembly. Coat entire faylng surface
area with sealant during assembly and apply sealant bead after assembly to the lap joint. The
panels shall then be foamed in placed using non-reverting polyurethane.
d. Drain holes. Structures shall be designed to avoid pockets where debris or moisture might
accumulate. Inverted u-channel structural members do not accumulate moisture or debris
Closed structural configurations should have sloping surfaces towards dram holes which are
adequately sized and placed in the lowest sump areas. All interior surfaces shall be treated
IAW MIL-STD-808, with priming being the minimum finish requirement. The finish shall be
reapplied/applied through drain holes after welding operations
e. Doors Consideration shall be given to open configuration doors. Use of single panel doors
eliminate crevice corrosion sites and leads to easier maintenance of latches and window
mechanism
f. Alternate mater ials. Use of composites, polymers, etc., type materials should be investi-
gated. While not subject to corrosion, consideration of material interaction, environmental
stability and field repair should be investigated before recommending alternate material.
g Shields Wheeled vehicles shall have aprons or splash shields designed to prevent mud,
stones, debris and water from being thrown against areas outside of the wheel-wells
Re liability. The vehicle, Including all components, shall have a Mean-Time-Between-Failure
31.31
(MTBF) of not less than 250 hours demonstrated at a 0.80 confidence level in accordance with 4.6.9 A
failure is defined as the event or inoperable state in which any item, or part of an item, does not or would
not perform as previously specified Definitions of reliability terms not included herein shall be as found in
MIL-STD-721 and MIL-STD-781. In the event of a conflict between these documents, MIL-STD-781 shall
take precedence. The vehicle shall be designed for a life expectancy of at least 12 years.
a i n t a i n a b iIl i t y The vehicle shall be designed and constructed to provide the following
3.1.3.2
a. Servicing, for components that require scheduled service, without disturbing adjacent
components.
b. 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.
c Ease of adjusting, servicing, and replacing parts and components.
d. Use of vehicle mechanic's common hand tools and vehicle maintenance shop equipment
e Maintenance with a minimum number of tools.
f. Mean corrective maintenance downtime of no greater than one hour.
g. Maximum repair time, excluding time to troubleshoot, of no greater than eight hours.
h. Maximum time for one person to perform all required daily scheduled maintenance and
servicing tasks of no greater than 15 minutes total
i. Designs giving consideration to modular system components and quick disconnect type
electrical wiring harness connectors.
3 1 . 3 . 2 . 1 Maintenance tasks. The vehicle shall be designed so that one mechanic, using common hand
tools, can perform the following maintenance operations within the time specified:
a. Remove, replace, and adjust all engine driven belts - 3/4 hour
b. Remove and replace alternator - 1/2 hour.
c. Remove and replace all filters, screens, and strainers in all hydraulic systems - 1/2 hour
d. Remove and replace engine coolant system hoses, fill cooling system to the proper level,
and check/repair coolant leaks - 1/2 hour.
e Drain engine lubricating oil, remove, and replace oil filter element(s) and refill crankcase
3/4 hour.
f
Remove and replace fuel filter element(s) and bleed air from fuel system - 1/2 hour
7
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