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|  MIL-D-707B9A (AR)
3.6.2
Mechanical
characteristics.
3.6.2.1 Mechanical envelope. The envelope of the DRU,
excluding connectors, shall be in accordance with Figures 6
through 10 inclusive. Dimensions shall be maintained as
specified, BIT indicators, DS1 and DS2, and the elapsed time
meter, M1 shall be located as shown, and shall be covered to
prevent access except during troubleshooting and maintenance
actions. Handles shall be provided for lifting the DRU and shall
be located as shown.
The DRU mounting provisions and reference
3.6.2.2 Mountinq.
datums shall be in accordance with Figures 8 through 10.
The weight of the DRU shall not exceed 55
3.6.2.3
Weight.
pounds.
The DRU shall have a
3.6.3 Reliability.
Mean-Time-Between-Failure (MTBF) of 4000 hours or greater.
3.6.4 Maintainability. The DRU shall be designed in
accordance with the requirements contained herein to achieve ease
and economy of maintenance.
maintenance. The DRU shall, upon
3.6.4.1 Corrective
occurrence of a single malfunction, be restored to operation, by
replacement, within a meantime-to-repair (MTTR) of 30 minutes at
the organizational level. Times include fault isolation,
removal, and replacement, but do not include supply and
administration time;
3.6.4.2 Preventive maintenance. The DRU shall not require
any preventative maintenance other than cleaning of exterior
surfaces to remove dust, dirt, and other foreign particles.
3.6.4.3 Adjustments/calibration. The DRU shall not require
any adjustments or calibrations in the field that require
operator interaction, nor shall the DRU require zero-velocity
updates more frequently than stated herein.
60
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