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|  MIL-C-53057(ME)
Load placement test
(test method No. 26 for 760 cycles)
180
180
180
Functional evaluation test
(test method No. 30 for 200 cycles)
200
200
Road test
(see 4.6.2.29.3)
300
Reliability and endurance will be evaluated using these tests. More
than 14 reliability failures (see 4.6.2.29.1) shall constitute
failure of this test. No endurance failures (see 4.6.2.29.2) are
allowed. Note: crane 3 shall undergo the road test first and the load
placement test second. In addition, failure to meet the fuel tank
capacity specified in 3.10.2.4, or exceeding the temperature limits
specified for the cooling system (see 3.10.2.6), engine oil (see
3.10), transmission oil (see 3.11.1.1), universal joints (3.11), or
hydraulic system (see 3.12) shall constitute failure of this
evaluation.
4.6.2.29.1 Reliability failure. A reliability failure is defined as
any unscheduled maintenance action requiring more than 15 minutes to
repair. Those malfunctions resulting from accidents, noncompliance
with prescribed operational or maintenance procedures, faulty test
instrumentation, fail-safe devices operating as specified, and
dependent secondary failures shall be considered nonrelevent
failures. Any impending malfunction detected which constitutes a
safety hazard to operating personnel or would cause secondary damage
either to the item under test or testing instrumentation will be
corrected prior to malfunction and considered as a relevant failure.
Hours specified herein shall be productive clock hours excluding
fueling, servicing, and downtime.
4.6.2.29.2 Endurance failure. An endurance failure is defined as
any failure which results in permanent structural deformation of the
crane or its components, or any failure which is corrected by
redesign or by replacement of a failed component with a component of
different configuration in order to meet specified performance
requirements, or failure resulting in replacement of the engine,
transmission, transfer case, hydraulic pumps or motors, hydrostatic
pumps or motors, hydraulic cylinders or the drive axle.
4.6.2.29.3 Road test. The road test shall consist of travel unladed
over unimproved roads (see 6.8.5) at an average speed of 9 mph.
4.6.2.30 Maintainability. Maintenance times shall be recorded
throughout load placement testing in accordance with test method No.
26. A maintenance ratio of more than 0.25 as specified in 3.7 shall
constitute failure of this test.
4.6.2.31 Run-in. Each crane shall be driven through a run in for
-
not less than 1 hour. The run in shall include operating in all
-
gears, operating all electrical equipment, and performing all
hydraulic functions. Evidence of any deficiency, need for adjustment
or maintenance, malfunction of any component, or evidence of leakage
of air, fuel, lubricant or hydraulic oil, shall be cause for
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