DA20-C1 Flight Manual
Supplement 5
Doc # DA202-C1 April 16, 2009 Page S5 - 7
Revision 24 DOT Approved
5. PERFORMANCE
There is no change in airplane performance with the autopilot system installed.
6. WEIGHT AND BALANCE
The installation adds 11.1 lbs (5.0 kg) of weight at a –24.6 in (–.62 m) arm.
7. DESCRIPTION OF THE AIRPLANE AND ITS SYSTEMS
7.15. System Description
The System 30 is a pure rate autopilot which uses an inclined rate gyro in the Turn Coordinator
instrument as the primary roll and turn rate sensor and an accelerometer and an absolute
pressure transducer as pitch rate sensors. The turn coordinator includes an autopilot pick-off, a
gyro RPM detector and an instrument power monitor. Low electrical power will cause the
instrument "flag" to appear while low RPM will cause the autopilot to disconnect. The autopilot
includes an automatic pre-flight test feature that allows a visual check of all the annunciator
lamps and checks critical elements of the accelerometer system. The test feature will not
enable autopilot function unless the automatic test sequence is satisfactorily completed.
When the pre-flight test is satisfactorily completed and when the rate gyro RPM is correct, the
green "RDY" light will illuminate indicating the autopilot is ready for the functional check and
operation. The autopilot cannot be engaged unless the "RDY" light is illuminated.
A Directional Gyro (DG) or compass system supplies heading information to the autopilot by a
heading bug in the instrument.
Pitch axis control is provided for the altitude hold function by use of the accelerometer and the
pressure transducer. When the altitude hold mode is engaged an elevator trim sensor in the
pitch servo will detect the elevator trim condition. When elevator trim is necessary to re-
establish a trimmed condition, trim indicator lights on the Turn Coordinator will illuminate to
indicate the direction to trim to restore a trimmed condition. In addition to the indicator lights an
audible tone will sound.
If the pilot ignores a trim light for more than five seconds, the light will begin to flash to get the
pilot's attention.
The indicator and annunciator lamp brilliance is controlled through the aircraft instrument light
rheostat, except for the "trim" indicators, which always illuminate at full intensity.
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