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|  MIL-T-62110G
conditions. Any evidence of cracks or permanent deformation shall be cause for rejection of the
vehicle. At the manufacturer's option, dye penetrant and magnaflux inspection may be
conducted prior to the first production vehicle inspection provided all tests specified in 4.4.2
through 4.4.3.4 are conducted prior to the inspection; these tests are repeated at the first
production vehicle inspection; and records of the tests and magnaflux and dye penetrant
inspection witnessed by the Government are presented at the time of the first production vehicle
inspection.
4.4.3.5.1 Critical area. At least the following areas shall be inspected by dye penetrant
or magnaflux:
(a)
Outriggers and attaching areas
(b)
Turret base, trunnion, and yoke at attachment of the derrick and struts
(c)
Cylinder clevis brackets
(d)
Lower sheaves, sheave supporting brackets, cable anchor and support brackets
(e)
Upper sheaves, sheave supporting brackets, cable anchor, and support brackets
(f)
Structural steel of upper and lower derrick
(g)
Upper derrick and yoke at attachment to basket and side brackets
(h)
Fiberglass extension.
4.4.3.6 Temperature stabilization test. To determine conformance to 3.12.7, the vehicle
shall be tested. The vehicle shall be placed in an area suitable for digging holes in firm,
undisturbed soil and prepared for digger operation. The auger used shall be of the 24-inch size
for size 55 vehicles and of the 30-inch size for size 70 vehicles. The ambient temperature shall
be measured and recorded and a thermocouple or thermometer inserted in the hydraulic fluid
reservoir at its inlet from the oil return line or, if an oil cooler is provided, at the inlet to the oil
cooler. The digger shall be suspended just above the ground and continuously rotated at not less
than 75 rpm. The temperature of the hydraulic oil at the hydraulic oil return line or at the inlet to
the oil cooler, as applicable, shall be observed and the digger rotated until this temperature has
stabilized. Immediately after the temperature stabilizes, the digger shall be used to dig a series of
holes not less than 12 feet deep. Each hole shall be dug in rapid succession, with truck
movement time held to the minimum, and with spin-off time held to a minimum. For hard,
frozen ground or other hard soil requiring picking for removal, not less than three holes shall be
dug. For all other firm, undisturbed soil conditions, not less than five holes shall be dug. A
hydraulic fluid temperature exceeding 180F at any time during the test shall be cause for
rejection.
4.4.4 Position holding ability. The vehicle shall be placed in a longitudinal position on a
grade of not less than 15 percent and not leveled by use of the outriggers. The telescoping
section position, height, angle, and load producing maximum tipping moment within the
conditions specified in table III shall be calculated. The derrick shall be placed under these
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