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|  MIL-N-81604C(AS)
3.4.1.1.1 BIT Mode - This test shall be selected by placing the
CIU MODE switch in the BIT position. The length of the time required
to complete the tests in this mode, excluding the navigate test,
shall be less than 1.5 minutes.
Navigate Test. An "on deck" navigate run may be
a.
performed for IMU evaluation while in the BIT
mode.
Malfunction Indicators Test. The BIT mode shall
b.
also test the ANCU controlled BIT indicators.
The ANCU, CIU, CAU, and IMU malfunction flags
*
and/or lamps shall indicate a failure for the
first 10 seconds in BIT mode and will return to
the normal IFPM malfunction display thereafter.
IFPM. In addition, all continuous in-flight per-
c.
formance monitoring tests (refer to 3.4.1.2) shall *
be performed in this mode.
3.4.1.1.1 Off Mode - In the OFF mode, the +32 VDC unregulated
and the 28 VDC regulated PSU outputs shall be turned off. Also
the aircraft 115 volt 400 Hz power used in the IMU shall be dis-
connected, internally to the IMU. A maximum of 15 watts power
for power Supply control and battery charging may be used in this
mode. Aircraft panel lighting power, +5V, will be utilized to
illuminate the CIU front panel. A discrete shall be provided
that will indicate a power off condition to all associated
equipment.
3.4.1.1.3 NORM Mode -The NORM position of the MODE switch shall
place the selection of the alignment and navigation modes under
computer control. It shall include the following sutmodes to be
*
selected automatically:
Align Submode. The equipment shall be capable of
a.
performing carrier, ground, and in-air alignment.
*
This mode shall be initiated by placing the CIU
MODE switch in the NORM position. Upon completion
of the equipment coarse alignment phase, which is
common to all alignment modes, the IMU acceler-
ometer axes shall be aligned to the proper orien-
tation by computer control. An indication shall
be provided on the CIU when alignment is in pro-
gress and another indication when alignment is
complete. The equipment shall be mechanized so
+
that the aircraft may be taxied any time one
minute after equipment turn-on at ambient
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