• Heading Failure
Heading failure is indicated by removal of the digital magnetic heading display
on the HSI and a red annunciation.
If GPS ground track is available, it will automatically be displayed in place of
heading. The heading bug and course pointer will continue to function normally,
using GPS ground track as a reference instead of magnetic heading.
If GPS track is not available:
1. Use standby compass for heading reference.
NOTE
Without magnetic heading or GPS track, the CDI provides no directional
information. Only course deviation information is presented, and the
orientation of the CDI is based on the selected course, regardless of aircraft
heading. Course deviation indications will behave like a traditional CDI.
VOR deviations will be relative to the selected course with a TO/FROM
indication. Localizer deviations will not be affected by the selected course,
and reverse sensing will occur when tracking inbound on a localizer back
course.
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