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| The System Fifty Five X is a rate autopilot that controls the roll and pitch axes of the aircraft. As the pilot enters the desired mode by pressing the appropriate mode selector switch, the computer acknowledges the mode, causing the appropriate annunciator to illuminate. |
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| When power on all segments of the Programmer / Computer display and annunciators illuminate for 5 seconds during test (shown above). Satisfactory completion of the SELF-TEST is indicated when the ready (RDY) annunciator remains on at the end of the 5-second self-test . |
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| HEADING MODE |
| Set the heading bug on the DG or HSI to the desired heading, and press the HDG button. The HDG annunciator will illuminate. New headings can be selected simply by repositioning the heading bug |
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| NAV Intercept and Tracking / GPS Steering (GPSS) Mode |
| To intercept and track a VOR course, select the desired course with the HSI Course Pointer and engage the NAV Mode, NAV will be displayed on the annunciator. If and external switch NAV/GPS is in GPS position, pressing NAV switch will engage this mode and the autopilot will automatically steer the aircraft on the GPS path, and NAV GPSS will be displayed on the annunciator. |
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| Approach (APR) Mode |
| To engage this mode press the APR switch. APR will be displayed on the annunciator. |
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| Glide-slope arming will occur when Glide-slope signal be valid. Illumination of the GS annunciator will occur, indicating arming has been accomplished. |
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| The ALT annunciator remains on. Glide-slope capture is indicated by extinguishing of the ALT annunciation. |
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| Reverse (REV) Mode |
| The Reverse Mode provides roll commands for intercept and tracking the localizer back course inbound or localizer front course outbound. APR and REV will be displayed on the annunciator. |
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Altitude (ALT) |
| The Altitude Mode, ALT , may be engaged with any roll mode displayed by pressing the ALT Mode switch. The aircraft will capture the altitude selected in the Altitude Selector/Alerter. When the elevator trim is in motion, TRIM and the up or down symbol will annunciate indicating trim in motion and the direction of travel. |
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| Vertical Speed (VS) |
| In this version, if Altitude Mode is active this switch hide/displays the VS announcement and the current Vertical Speed. |
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