Standby Magnetic Compass

T-34C AIRCRAFT SYSTEMS FAMILIARIZATION

CHAPTER TWELVE

WORKBOOK

RMI Disable Switch

The RMI disable switch is located on the front cockpit avionics panel and is labeled AFT CKPT,

RMI, ON, and OFF. Placing this switch in the OFF position removes the electrical power to the

aft cockpit RMI. This switch is used only for training purposes during instrument training

flights.

Standby Magnetic Compass

The standby magnetic compass, located on top of both instrument panel glareshields, indicates

the aircraft's approximate magnetic heading. It is a standby or backup compass for navigation in

case of gyro compass system failure. It is a self-contained instrument comprised of a nonferrous,

liquid-filled bowl which contains a compass card, visible through a window in the bowl.

Heading is determined by reference of the lubberline on the window to the compass card. Its

accuracy is greatly affected by maneuvering of the aircraft.

GYRO AND STANDBY COMPASS SYSTEMS 12-5