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The software of the Avidyne IFDs as referenced
above will produce lateral deviations to the
final approach course as soon as the leg to the
FAF becomes active. Therefore when the leg does
not align with the final approach course, the
CDI will show a deviation when, in fact, the
aircraft is on the proper course for the active
leg.
This could result in the pilot making flight
decisions that put the aircraft in unsafe flight
conditions, flying into airspace that was, by
the GPS approach design, to be avoided (terrain,
obstacle, traffic, restricted). AD
Requirements:
This AD requires incorporating an operational
limitation into the Limitations Section of the
airplane flight manual (AFM) or airplane flight
manual supplement (AFMS). The operational
limitation will contain the following:
• “Flying a full procedure
(non Vector-to-Final) GPS approach, with a
course change at the Final Approach Fix (FAF),
is prohibited.”
• “Flying a GPS approach, with a Direct-To or
with an Omni-Bearing Selector (OBS) leg to the
FAF, is prohibited.”
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