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|  MIL-N-814974A(AS)
3.4.1.2.7 (Continued)
Notes
This submode depends upon the
(1)
availability of external Doppler
radar signals which shall be used
as a velocity reference.
Equipment mechanization shall auto-
(2)
matically determine if an inflight
alignment or Doppler-damped inertial
navigation operation shall be performed.
Doppler-damped inertial navigation
(3)
operation shall automatically succeed
the inflight alignment operation.
During Doppler-damped inertial navi-
(4)
gation operation, a failure of the
external Doppler radar shall "
automatically result in the equipment
switching to the unaided inertial
navigation operation.
Navigation Submode - In the Navigation Submode
(3)
of the Inertial Mode, the equipment shall compute
aircraft present position, velocity, heading
and attitude as described in 3.4.1.2.2.
Self Test Submode - The Self Test Submode shall
(4)
provide an automatic pre-flight test of critical
portions of the equipment. This submode shall
be designed to be operable only in the Standby
Mode. During this Submode, the equipment shall
be activated and shall automatically perform
prescribed tests in a specified sequence. If
the test is unsuccessful (failure) the equipment
shall provide a visual display of the faulty
component(s). The Self Test Submode design
shall be such as to permit termination at any
time to permit selection of the operational modes
of Inertial, Slave, Free or Compass.
Position Fixing - The equipment shall be capable
2.4.1.2.8
of performing a manual position fix operation in the Inertial Mode which
shall be used to update computed present latitude and longitude.
Operations shall be performed using the Indicator, Position and shall be
as follows:
(1) Freeze latitude and longitude displays on
Indicator, Position (manual operation)
(2) Allow manual insertion of new position
coordinates.
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