Directional Gyro - Cirrus DESIGN SR20 Information Manual

Section 7 Cirrus Design
Airplane Description SR20
indicated. Power for gyro operation is supplied through the 5-amp
TURN COORDINATOR circuit breaker on the Essential Bus. Back-up
power for turn coordinator gyro operation is supplied by a 27-volt
battery pack.
Turn Coordinator Power Switch
The electrical power source for the turn coordinator is controlled
through the ELEC FLT INST PWR switch located immediately below
the turn coordinator. The switch has two positions: NORM and EMER.
When the switch is set to NORM, electrical power for turn coordinator
is supplied through the 5-amp TURN COORDINATOR circuit breaker
on the Essential Bus. Should the normal electrical system fail, setting
the switch to EMER will power the turn coordinator through a 27-volt
battery pack. The switch is left in the NORM position for all normal
operations. The batteries must be replaced at specified intervals
based upon the date appearing on the battery (refer to SR-20 Airplane
Maintenance Manual) and after each use to power the turn
coordinator.

Directional Gyro

The airplane is equipped with a directional gyro in the standard
configuration. If a directional gyro is not installed the airplane will be
equipped with an HSI.
The directional gyro, in the left instrument panel, displays airplane
heading by rotating a compass dial in relation to a fixed simulated
airplane image and lubber line. The compass dial rotates counter
clockwise for right turns. A knob, labeled HDG REF, on the lower right
corner of the instrument is used to set the day-glo yellow heading bug.
The compass dial should be set in agreement with the magnetic
compass just prior to takeoff. As the gyro will precess slightly over a
period of time, the directional gyro compass dial should be re adjusted
occasionally on extended flights.
To adjust compass card:
1. Push and hold knob at lower left corner of instrument.
2. While holding knob in, rotate knob to adjust gyro compass dial
with current magnetic heading.
3. Release knob.
7-20 P/N 13999-002 Info Manual
September 2011