Mooney M20M, Pilot Operating Handbook

Page: 271 / 377

GI 275 Part 23 AML STC
190-02246-12 Rev. 4
Airplane Flight Manual Supplement Page 31 of 70
FAA APPROVED
Abnormal Procedures
3.2.1 Heading Failure
If the GI 275 is configured with a VFR GPS or interfaced to a certified GPS
source, the HDG indications will be replaced with track (TRK) indications in
magenta in the event of a heading failure. The heading bug and course pointer
will continue to function normally, using GPS ground track as a reference
instead of magnetic heading.
Figure 4- Bottom of the ADI when HDG failed (with GPS)
Figure 5- Top of the HSI when HDG failed (with GPS)
If there is no GPS in the GI 275 system or if the GPS has failed, the heading
failure will be indicated by a red “X” in place of the heading readout on the ADI
or HSIs.
Figure 6- Bottom of the ADI when HDG failed (no GPS)
Figure 7- Top of the HSI when HDG failed (no GPS)