3rd Ed. Sep 30, 06 3-5
S–TEC
While tracking in the SOFT condition, the autopilot ignores short term CDI
needle deflections (excursions), to thereby inhibit aircraft scalloping during
VOR station passage. Should CDI needle deflection exceed 50% for a period of
60 seconds, the autopilot will revert to the CAP SOFT condition as a means to
re-establish the aircraft on course.
The NAV annunciation will flash whenever CDI needle deflection exceeds 50%,
or the NAV Flag is in view. In the latter event, the FAIL annunciation will also
appear.
While tracking in the SOFT condition and within 50% CDI needle deflection,
should it be desired to track in the higher authority CAP SOFT condition instead,
press the APR mode selector switch to engage the navigation approach
(NAV APR) mode. This is acknowledged as shown in Fig. 3-6 and Fig. 3-7.
While tracking in either the SOFT or CAP SOFT condition, if a new course is
selected that is different from the original course by 10° or more, then the
autopilot will revert to the CAP condition.
Fig. 3-3. Remote Annunciator Display, NAV Mode Engaged, CAP Condition
Fig. 3-4. Remote Annunciator Display, NAV Mode Engaged, CAP SOFT Condition
Fig. 3-5. Remote Annunciator Display, NAV Mode Engaged, SOFT Condition
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