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* Operational if heading system is installed and active. In altitude hold mode, altitude can be adjusted (trimmed in increments using the UP/DN commands). Used to command vertical speed changes - 160 FPM change for every second the button is depressed. Include VS, indicating vertical speed command has been selected ALT, indicating altitude hold is engaged, capturing existing altitude and GS, indicating glideslope coupling is armed and/or active.
#STEC 50 AUTOPILOT TROUBLESHOOTING MANUAL#
TRIM used in manual pitch trim mode UP/DN annunciates out-of-trim conditions. horizontal situation indicator (HSI) The HSI provides a basic horizontal view of the aircrafts navigation picture. To enable or disable FD (if equipped) and AP/HDG (heading), NAV (coupled tracking VOR/LOC/GPS, enroute or approach), REV (LOC back courses), VS (vertical speed) command, ALT (altitude) hold, YD (yaw damper, if equipped), and UP or DOWN vertical speed command buttons. Flashing NAV or REV annunciates course deviation of 50% or more. System automatically selects APR (approach) mode when using a localizer signal. It seemed perfectly content to have itself turned back on again, but.
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This morning, very shortly after I snapped that picture, the autopilot simply turned itself off. These units have been extremely reliable as long as N631S has been with us. Altitude loss during a malfunction and recovery. N631S is equipped with an STEC System 50 autopilot with GPSS (GPS Steering) capability. Moving the autopilot master switch to 'OFF' position. Intercept and track VOR/GPS enroute and LOC/VOR/GPS approach signals. Depressing the 'ON-OFF' Switch on the autopilot programmer unit. When HDG and NAV activated simultaneously, enables dual mode intercept - autopilot operates in heading mode to automatically intercept and track selected course or localizer at this point HDG extinguishes. HDG (heading) Mode-Heading Preselect and Hold.sensitivity for course capture, NAV/CAP and SOFT for medium sensitivity to establish track and crosswind correction, and NAV/SOFT for lowest level for smooth enroute trackiing and station passage. Though crude and poor-flying by todays standards, the contraption surely. All of this will help the pilot simplify navigation. Annunciates 3-level gain scheduling for enroute course intercept and tracking NAV/CAP indicates max. Wiley Post dubbed his 75-pound Sperry autopilot Mechanical Mike. A typical HSI will include a compass card, heading flag, autopilot heading bug, slaving meter, lubber line, course arrow, nav flag, miniature airplane, course reciprocal pointer, and left-right deviation bar. Provides complete information on all modes of operation, including failure warnings.