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Table I. Examination schedule
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Blade, Mine Clearing
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Main electrical harness and control system test



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MIL-B-53090(ME)
4.7 Tests. Units for first article inspection shall be tested in accordance with table II, test schedule.
TABLE II. First article inspection.
Inspection
Requirement
Inspection
Unit
Procedure
Paragraph
Paragraph
1  2
Mounting test
3.8.1
4.7.2.1
X X
Moldboards extensions mounting test
3.8.1.1
4.7.2.2
X X
Moldboards interface test
3.9.1
4.7.2.3
X X
Electrical hardness interface
3.9.2
4.7.2.3
X X
Break-in
3.12.a and c
4.7.1
X X
Emergency release
3.10.2
4.7.3
X X
Emergency lifting mechanism
3.10.3
4.7.4
X X
actuation test
Plow depth test
3.10.b
4.7.5
X
Travel lock retention test
3.10.4
4.7.6
X
X
High temperature test
3.11, 3.10.1
4.7.7.1
X
X
Low temperature
3.11, 3.10.1
4.7.7.2
X
X
Reliability test
3.13.1, 3.13.2
4.7.8
X
X
Maintainability test
3.13.3
4.7.9
X
X
Fording test
3.12.e
4.7.10
X
Rain test
3.12.f
4.7.11
X
Lubrication inspection
3.14
4.7.12
X X
Tiedown provisions
3.19.1
4.9.1
X
Slinging provisions
3.19.2
4.9.2
X
Rail impact test
3.19.4
4.9.3
X
4.7.1 Break-in. After completion of the inspections as listed in table I, examination schedule, each
M1 MCBS shall be run for the distances specified in table III at the speeds indicated. The Ml MCBS shall
be in the travel mode throughout the break-in run. The M1 MBCS shall be lowered and raised three times
after each run. After completion of break-in, the M1 MCBS shall be inspected for evidence of damaged
components or loss of adjustment. These shall be corrected prior to continuing first article inspection.
TABLE III. Speed and distance for break-in run .
Test conditions
Speed
Distance
mph (kph)
miles
(km)
0-10
(0-16)
3
(4.8)
Cross country
5
(8.1)
Secondary road
10-20  (16-32)
7
(11.3)
Primary road
20-max (32-max)
4.7.2 Performance tests.
4.7.2.1 Mounting test. The M1 MCBS shall be mounted to an M1 series tank using four personnel
within one hour with the assistance of a lifting device. Timing for this test will begin with the M1 tank
stopped three feet from the MCBS - which shall be in its stored position. Test will end when the blade has
12

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