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Page Title:
Operation During Power Interruptions |
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|  MIL-N-81497A(AS)
3.4.1.2.8 (Continued)
(3) Compute accrued incremental distance in latitude
and longitude from time of step (l).
(4) Generate corrected present position data by
adding new inserted coordinates plus accrued
distances.
Operation During Power Interruptions - The equipment
3.4.1.3
shall contain an internal, battery which shall permit the equipment to operate
and perform within its specifications for aircraft power interruptions of up
to 10 seconds in duration. Battery capability shall be in accordance with 3.5.6.5.
Operations - The following is a list of those functions
3.4.1.3.1
that shall be maintained and operative during the interrupt period.
Battery in Use Indication - A visual indication of
(1)
the power interruption condition and subsequent
operation on the equipment battery shall be provided.
Alignment Operation - The alignment operation in the
(2)
Inertial, Slave and Free Mode, except during the first
60 SEC of operation, shall continue uninfluenced by
power interruptions. If the Power interruption occurs
during these first 60 SEC, the equipment shall repeat
those operations as required after the end of the
power interrupt period. The equipment shall be main-
tained in an attitude-heading reference mode during
inflight alignment when power interruptions occur.
System Failure Detection Circuitry - System failure
(3)
detection circuitry shall be maintained operative
during the power interruption period.
Slave and Free Mode - The Gyroscope Assembly shall be
(4)
maintained as a stabilized inertial reference pro-
viding acceleration, heading and attitude references.
Synchro output signals shall not be provided.
Inertial Mode - Navigate and Damp-On Submodes - The
(5)
equipment shall continue to compute aircraft velocity
components (VNS and VEW) and aircraft present position
(latitude/longitude). In addition a digital output of
last computed true heading shall be provided. In the
Damp-On Submode, the equipment shall automatically
revert to un-aided inertial navigation operation during
power interruption periods.
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