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Page Title:
Improved TOW Vehicle (ITV) kit reliability |
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|  MIL-V-62347(AT)
3.2.1 Improved TOW Vehicle (ITV) kit reliability. The ITV kit shall demonstrate a
minimum of 180 hours Mean-Time-Between-Failure (MTBF) when installed and operated in an
M113A1 vehicle in accordance with the operational profile (see 3.2.3). For calculating MTBF,
the definition of combat mission failures in the Improved TOW Vehicle RAM-D Failure
Definition and Scoring Criteria shall be used (see 6.9).
3.2.2 ITV kit maintainability. The ITV kit, when installed and operated in an M113A2
vehicle, shall not exceed the following maintenance ratios:
Organizational maintenance:
0.05
Direct support maintenance:
0.04
Combined maintenance:
0.09
The maintenance ratio shall be calculated by dividing the total maintenance man-hours
(exclusive of daily crew checks and services) by the total operating hours.
3.2.3 Operational profile.
3.2.3.1 Chassis. Apportioned test mileage:
a. 20 percent hard-surfaced roads.
b. 40 percent secondary roads.
c. 40 percent cross-country.
3.2.3.2 ITV kit. The operational profile for the ITV kit shall consist of:
-
11.5
hours duration
- 1.9 hours active weapon station hours
- 10
missile firings of simulated missile firings
-
7
reload cycles
-
7
erect/traverse/stow cycles
- 108
tracking cycles of 60 degrees each
- 25
miles of travel as follows:
- 5 miles primary road
- 10 miles secondary road
- 9 miles cross-country
- 1 mile cross-country, 5 mph or less, with launcher erect
3.3 Materials. Materials shall be as specified herein and in referenced specifications,
standards and drawings. Material shall be free of defects which adversely affect performance or
serviceability of the finished product (see 6.8).
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