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T-34C AIRCRAFT SYSTEMS FAMILIARIZATION
CHAPTER TWELVE
WORKBOOK
CHANGE 1
Figure 12-2 Radio Magnetic Indicator
The heading index is a stationary triangular-shaped reference mark located at the top of the RMI.
The compass card rotates during aircraft heading changes and is graduated in 5 increments.
Aircraft magnetic heading is read under the heading index. A single needle provides bearing
information to a VOR station if the VOR system is in use. A double needle provides bearing
information to a TACAN station if the TACAN is in use. The RMI requires both 26 VAC and
28 VDC.
Slaving Accessory
The slaving accessory, located in the avionics compartment, receives inputs from a flux detector
and a directional gyro and sends a heading signal to both RMI cards. The slaving accessory
requires 26 VAC.
Flux Detector
The flux detector is a 28-VDC electromagnetic compass located in the port wing tip that sends
magnetic heading signals to the slaving accessory. While accurate, it has an inherent instability
that gives the flux detector a + 2 tolerance.
GYRO AND STANDBY COMPASS SYSTEMS
12-3


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