Slaving Accessory

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