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System built-in-test during a mission. |
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|  MIL-D-70789A (AR)
3.10.2 System built-in-test at turn-on. At turn-on, the DRU
shall monitor vehicle primary power and determine whether the
voltage level is within the specified limits (3.5.4.2). If
primary power is outside limits, the DRU shall remain off, and
DS-1 shall indicate a failed condition. If power is acceptable,
the DRU shall energize. The DRU shall also perform serial data
bus circuitry BIT.
3.10.3 System built-in-test during initialization. After
being energized at turn-on or when commanded to RESTART, the DRU
shall perform BIT of itself. If the Configuration Definintion
Flag for Odometer/Exclusive ZUPT Mode (3.5.8.8a) is set, the DRU
shall perform VMS BIT (3.S.4.6) (see 3.5.3.l.ld for exception).
If the Configuration Definition Flag for the Odometer/Exclusive
ZUPT Mode is reset, the DRU shall not perform VMS BIT.
3.10.4 Svstem built-in-test during a mission. The DRU shall
continuously monitor vehicle primary power to determine whether
the voltage level is within the specified limits (3.5.4.2)
throughout the mission. If primary power is outside acceptable
limits, the DRU shall shut off, and DS-1 shall indicate a failed
condition.
The DRU shall monitor internal temperature. If the temperature
is high enough to cause degraded accuracy, a status alert shall
be indicated and bit 2 of ALERT DATA character D1 shall be set.
Should the temperature become high enough to cause damage, the
DRU shall automatically reenergize.
The DRU shall monitor its performance to determine if dynamic
conditions have exceeded the DRU's capability to maintain
specified accuracies. If rate loops become saturated or other
performance thresholds are exceeded, a status alert shall be
indicated and bit 1 of ALERT DATA character D3 shall be set. The
proper operator response for this condition shall be to perform
an abnormal shutdown and realign the DRU.
If a VMS is used, the DRU shall continuously evaluate the
validity of odometer data. Should odometer data be persistently
in error or if there is a significant loss of odometer data, the
DRU shall follow the procedures for VMS failure as described in
3.5.3.2.1.3.
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