- Pictorial Navigation System that provides navigation display for
cross-country flight and ILS approaches containing own source of
gyrostabilized magnetic heading
- Typically comprised of four units: 331A-3G Course Indicator,
323A-2G or 323A-3G Flux Detector, 328A-3G
Slaving Amp, and 332E-4 Directional Gyro
- Uses 323A-2G Compensator when Flux Detector is located in area not free
of magnetic material
- 331A-3G provides controls for course and heading selection
- 331A-3G contains outputs for autopilot or flight director, VOR Receiver &
additional
compass loads
- All 331A-3G models contain bootstrap synchro as additional source of slaved
gyro heading information (except -000 model)
- 331A-3G models available with or without internal lighting (see 331A-3G)
- 331A-3G lighted models available with 5 or 28 Volt, white or blue-white
lighting (see 331A-3G)
- 331A-3G models available w/ EZ/ORZ choke for usage w/ 30 or 400Hz OBS resolvers
(see 331A-3G)
- 328A-3G model available that contains signal buffer to drive a compass slaving meter
(see 328A-3G)
- 332E-4 Electrically driven with continuous service and quick warmup
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