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|  MIL-N-81604C(AS)
Para 3.4.1.1.3C
(cont)
(3)
Emergency Magnetic - A magnetic heading
synchro output shall be available which
follows the ML-1 (or operational equivalent
or better) remote compass transmitter input,
corrected for magnetic deviation. This mode
shall be entered in the event of an equip-
ment failure not involving the magnetic
heading servo hardware and its associated
excitation. This mode shall be provided
entirely within the aircraft unique CAU for
applications where it is a specified aircraft
I
requirement.
3.4.1.1.4 Ins Mode - The selection of this position shall pro-
Vide a means to override doppler or doppler-aided navigation
*
*
manually, should operational conditions warrant such action.
This position of the CIU MODE switch shall provide all of the
automatic mode switching described for the NORM position, except
*
hat all modes utilizing doppler information are disallowed.
.4.1.1.5 MAG SLV Mode - The selection of this position shall
*
provide a means to select the magnetic slaved attitude reference
mode manually, should operational conditions warrant such action.
this mode will take the IMU out of ANCU control of the gyros and
Place it in the magnetic slaved attitude reference mode. This
*
mode shall operate as described in 3.4.1.1.3c(1).
.4.1.1.6 Free Mode - The selection of this position shall pro-
*
ide a means to select the platform free attitude reference mode
anually, should operational conditions warrant such action. This
*
ode will take the IMU out of ANCU control of the gyros and place
t in the platform free attitude reference mode. This mode shall
*
perate as described in 3.4.1.1.3c(2).
.4.1.1.7 EM MAG Mode. - The selection of this position shall
*
rovide a means to select the emergency magnetic heading refer-
*
should
operational
conditions
warrant
such
This mode will select the flux valve followup mode of
peration which is described in 3.4.1.1.3c(3).
*
.4.1.2 In-Flight Performace Monitoring - In-Flight Performance
onitoring (IFPM) is performed in all modes except OFF, unless
inhibited by malfunction. When the computer is operational,
iagnostic tests shall be performed which will exercise the
computer controlled portions of the IMU,ANCU, CAU, and CIU to
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