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|  MIL-N-81604C(AS)
3.5.5.6 POS FIX Pushbutton - Depressing the POS FIX pushbutton
shall establish the instant at which position fix data are to be
temporarily stored in the CIU. This includes both aircraft pre-
sent position and external radar information. The DATA switch
*
must be in either the FLYOVER or OFFSET position in order to
initiate, accept, or reject a position fix. To reject the posi-
tion fix, the CLEAR pushbutton shall be used. Depressing the
ENTER pushbutton shall cause the computer to accept the position
fix and correct the aircraft present position.
3.5.5.7 CIU Malfunction Flag - The CIU malfunction flag shall
be set (white dot indicator visible) by the ANCU any time the
ANCU detects a malfunction in the CIU. This flag shall be
*
latched magnetically and, even with power removed from the CIU,
shall continue to display the appropriate malfunction status of
the CIU. In the event that the ANCU malfunctions in a manner
such that it is incapable of determining whether the CIU is
operational or not, the ANCU built-in-test hardware shall output
a reset signal to the CIU flag, thus inhibiting the ANCU from
erroneously setting it. The CIU flag may also be reset exter-
nally by the avionics, if desired.
3.5.5.8 Equipment Status Indicators - The following discrete
lamps shall indicate the system malfunction, align, navigation,
and backup mode status:
LINK - The LINK lamp ON shall indicate data
a.
link information is being received.
ALN - The ALN lamp ON shall indicate the
b.
platform is being aligned.
FREE - The FREE lamp ON shall indicate the
c.
system is in the FREE attitude reference
mode.
MS - The MS lamp ON shall indicate the equip-
d.
ment is in the magnetic slaved attitude
reference mode.
EM - The EM lamp ON shall indicate the equip-
e.
ment is in the emergency magnetic heading
reference mode.
INS - The INS lamp ON without the DOP lamp
f.
ON shall indicate the inertial navigation
mode and, with the DOP lamp ON, the doppler-
inertial navigation mode.
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