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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.
The following list describes the various features illustrated in Figure 1.
1.
Turn Coordinator – Provides basic flight information, autopilot mode switching and annunciation.
2.
Mode Annunciation window – displays mode in use.
3.
Green Ready (RDY) Light – Illuminates when autopilot is ready for engagement. When autopilot is disconnected, "RDY" will flash for five seconds accompanied by a beeping audio tone.
4.
Mode Select/Disconnect Switch – Each momentary push of this knob will select an autopilot mode, left to right, beginning with ST (Stabilizer) mode and ending with (Hi) TRK mode. Holding the knob in for more than 2 seconds will disconnect the autopilot. Turning the knob left or right in the stabilizer mode will provide left/right commands to the autopilot proportional to knob displacement up to a standard rate turn.
5.
Altitude Hold Engage/Disengage Switch – This control stick mounted switch will engage or disengage the Altitude Hold Mode as desired. The blue (ALT) light on the annunciator panel will illuminate when ALT. mode is engaged.
6.
Heading Mode – If the system is equipped with a D.G., this mode will permit preselected left/right turns using the D.G. heading bug.
7.
TRK (Track) – using the (Lo) mode of the tracking feature will provide low system gain for comfortable cross country tracking of VOR or GPS signals. Using the (Hi) mode of the tracking feature will provide a higher level of system gain for more active tracking of VOR, GPS or Localizer front course signals.
8.
Trim UP Light – Illuminates to indicate the need for nose UP trim.
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