T-34C AIRCRAFT SYSTEMS FAMILIARIZATION
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
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