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|  MIL-C-53057(ME)
3.9.1.1 ANSI stability. The crane shall conform to ANSI
B30.5 stability requirements.
3.9.1.2 Dynamic stability. The crane shall negotiate a 15
percent slope without load in full circle operation at maximum
steer angles in both directions without any wheel leaving the
ground. The crane while descending a 25 percent grade in the
forward direction at not less than 2 mph, shall be capable of
stopping within a distance of 20 feet by applying the service
brakes at a pressure that prevents the rear wheels from
leaving the ground. The crane, when stopped on the 25 percent
slope, shall be held by the service brakes for not less than 1
minute.
3.9.2 Longitudinal gradeability. The crane shall ascend a 30
percent grade in forward gear range at a speed of not less
than 2 mph without load.
3.9.3 Travel speed. The crane shall be capable of travel
speeds on a level surface of not less than 18 mph forward
without load.
3.9.4 Fording. The crane shall be capable of operation in
seawater to a fording depth of 30 inches. Crane components
shall be protected from damage, malfunction and corrosion due
to immersion followed by drying for those components below the
fording level, and due to splash and spray for those
components above the fording level. When tested as specified
in 4.6.2.26 the crane shall operate during and after fording
operation without malfunction or damage from corrosion.
3.9.5 Lifting speeds.
3.9.5.1 Boom lift speed. The boom lift speed shall be not
less than 1.5 degrees per second.
3.9.5.2 Hook lift speed. The main hook block lifting speed
with the recommended number part lines shall be not less than
40 feet per minute. The auxiliary hook block lifting speed
with the recommended number part lines shall be not less than
55 feet per minute.
3.9.6 Lowering speeds.
3.9.6.1 Boom lowering speed. The boom lowering speed shall
be not more than 3.5 degrees per second and not less than 1.5
degrees per second at governed engine speed with the control
valve in the full open position.
3.9.6.2 Hook lowering speed. The main hook block lowering
speed with the recommended number part lines shall be not more
than 80 feet per minute and not less than 40 feet per minute
at governed engine speed with the control valve in the full
open position. The auxiliary hook block lowering speed with
the recommended number part lines shall be not more than 100
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