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Page Title:
Reliability and maintainability |
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|  MIL-B-53090(ME)
3.10.3 Emergency lifting. The total time required to raise each moldboard assembly from the plowing
to travel position using the emergency lifting belts shall not exceed 25 seconds once the operator starts
lifting the moldboards, (see 4.7.4).
3.10.4 Travel lock retention. Each travel lock mechanism shall serve as a latch to hold the moldboard
assemblies into the raised position for travel while not plowing. The travel lock shall not disengage or be
adversely affected when tested in accordance with 4.7.6.
3.11 Environmental requirements. The Ml MCBS shall operate in temperature extremes of 110 F
(43 C) and -5 oF (-20 oC) in accordance with MIL-STD-210. The M1 MCBS shall experience cold soak
o
temperature to -25 F (-32 C) when attached to the tank, (see 4.7.7). The M1 MCBS will plow on all
terrain in which a tank can operate except frozen ground or extremely rocky terrain. Frozen ground is
defined as soil exhibiting frost action per ASTM D 653. Extremely rocky terrain is defined as soil whose
composition of rock equals or exceeds 30 percent by volume per ASTM D 653.
3.12 Performance characteristics. The Ml MCBS shall:
a. Have adjustable plow depths of: 8 in (20 cm); 10 in (25 cm); and 12 inches (30 cm),
(see 4.7.5).
b. Neutralize 90 percent of the anti-tank mines and explosive devices from the area in front of the
tank's track, (see 4.7.8). (Neutralize is defined as one of the following: crush, destroy, detonate
or push aside).
c. Have an operational plow speed of 3-10 mph (5-16 kmh), mainly dictated by soil conditions,
(see table IV).
d. Operate on uneven terrain (rolling terrain and 40 percent side slopes), (see 4.7.8).
e. Be capable of clearing mines while traversing fords as well as cross-country mine fields,
(see 4.7.10).
f. Be capable of withstanding rain and humidity without preparation, (see 4.7.11).
3.13 Reliability and maintainability.
3.13.1 Reliabilitv. The M1 MCBS shall be designed to have mean time between failure of at least
80 hours exclusive of failure caused by mine detonation, (see 4.7.8).
3.13.2 Mission reliability. The Ml MCBS shall have a mission reliability of .90 probability of
completing a mission. A mission shall consist of the following:
a.
Install M1 MCBS on the Ml series MBT.
b.
Advance forward to mine field area.
c.
Release the moldboards to drop into a plowing position.
d.
Proceed forward to plow 982 feet (300 meters) at required depth and plowing speeds.
e.
Energize the lifting/lowering mechanism and raise plow to travel position, engaging travel
locks and locking the Ml MCBS in travel position.
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