MIL-C-53057(ME)
openings are used on the exterior of the crane, the edge of the
opening shall be smooth and shall be provided with a removable or
hinged cover whenever it is required. Dimensions of hand or arm
access openings shall be in accordance with SAE J925 for arctic
clothing. When tested as specified in 4.6.2.30, the crane shall have
a maintenance ratio (MR) of not more than 0.25. The MR is defined as
the ratio of total active maintenance man-hours required (scheduled
and unscheduled) to the total operating time. Man-hours for repair
of replaced components and scheduled before and-after operation
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checks are excluded. Scheduled maintenance shall be required not
more often than every 50 hours, except for before and-after
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operation checks. Each operation in the following maintenance
operations list shall be accomplished by one person (except where
otherwise specified) in not more than the time specified, using
common tools and special tools, if any, furnished with the crane.
Test points identified for connection of STE/ICE to measure
functions in the Tk mode (see 3.41) shall be accessible without the
removal of other major assemblies and installed attachments not
normally removed.
a.
Remove, replace and adjust all engine driven belts - 3/4 hour.
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b.
Remove and replace alternator - 1/2 hour.
c.
Remove and replace all hydraulic-system filters - 1 hour.
d.
Remove and replace engine coolant-system hoses - 1 hour.
e.
Drain engine lubricating oil, remove and replace oil filter
elements and refill crankcase - 1 hour.
f.
Remove and replace fuel filter elements - 1/2 hour.
g.
Disconnect battery cables, remove and replace batteries,
reconnect battery cables - 1/2 hour.
h.
Drain torque converter oil and transmission oil, remove and
replace all transmission filter elements and strainers, and
refill-converter and transmission - 1 hour.
i.
Remove and replace starter - 1 hour.
j.
Bleed and adjust brakes and refill master cylinder (if
applicable) - 2 men - 1 hour.
k.
Remove and replace headlight, floodlight and taillight bulbs
(not including blackout lights) - 1/4 hour each bulb.
l.
Remove, disassemble, service and install air cleaner - 1/2
hour.
m.
Lubricate all lubrication fittings with 2 strokes per fitting
using the gun and extension specified in 3.29.1 - 1 hour.
3.8 Reliability. The crane(s) shall have a mean time between
failure (MTBF) of 100 hours (see 6.8.9) when tested as specified in
4.6.2.29, using the failure definition in 4.6.2.29.1.
3.9 Performance. The crane shall conform to the requirements
specified herein under all conditions specified without damage or
permanent deformation. There shall be no evidence of accelerated
wear or failures when operated under service conditions specified
herein.
3.9.1 Stability.
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