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|  MIL-D-70789A (AR)
i.
Set bit 5 of STATUS character S1 when the DRU enters
Set STATUS bit S2/2 when
Normal Align or Stored Heading Align.
the DRU enters Stored Heading Align.
Set bit 7 of STATUS character S2 to indicate that a
j.
zero-velocity update has been initiated.
k.
If initial parameters have not been received, set bit
6 of ALERT DATA character D2 for Normal Align. ALERT bit D2/6
shall be reset for a valid Stored Heading Align.
l.
Be ready to accept and process initial parameters, if
they are input, via the ACCEPT POSITION or ACCEPT GEODETIC DATA
command.
3.5.3.1.1.1 Normal shutdown. If the previous shutdown was
normal (30.4.6 D1/0), the DRU shall accept initial parameters at
anytime during Normal Align if acceptance criteria are met. Up
to the time new parameters are accepted the DRU shall use the
current stored position. Initial parameters are input using the
ACCEPT POSITION (30.1.1) or ACCEPT GEODETIC DATA (30.1.S)
commands.
If initial parameters are input, the DRU shall perform
reasonableness checks as specified in 3.10.5. If criteria in
3.10.5 are not met, the DRU shall reject the data, set the
appropriate alerts as specified in 3.10.5 and continue Normal
Align using current stored position. If, subsequently initial
parameters are not input and accepted, when Normal Align is
complete, bit 6 of ALERT DATA character D2 shall be reset.
If initial parameters are input and pass reasonableness checks as
specified in 3.10.5, the DRU shall accept the data and reset bit
6 of ALERT DATA character D2.
If initial parameters are not input at anytime during Normal
Align, the DRU shall use current stored position, and at the
completion of Normal Align shall reset bit 6 of ALERT DATA
character D2.
Abnormal Shutdown. If the previous shutdown was
3.5.3.1.1.2
abnormal (30.4.6 D1/0), the DRU shall accept initial parameters
at anytime within the first 3.5 minutes of Normal Align if
acceptance criteria in 3.10.5 are met. On acceptance of the
initial parameters, the DRU shall automatically RESTART and reset
bit 6 of ALERT DATA character D2 and bit 0 of ALERT DATA
character D1. If initial parameters are not received and
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