Embraer Phenom 300
Flight Crew Air Transport Pilot (ATP)
Deviation - Speed All Types; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance
Flight Crew Overcame Equipment Problem; Flight Crew Returned To Clearance
Aircraft; Human Factors
On the approach for the ILS at ZZZ; at 7000 feet we were cleared direct ZZZZZ Intersection (magenta data); down to 5000 feet cleared approach and to maintain 210 knots. Upon reaching and turning to capture the localizer; the glideslope began dropping and the Pilot Flying (PF) called for manual activation of the localizer (green data). The aircraft snapped wings level; made an aural 'flight director' and continued to the right of the localizer track. The PF disengaged automation immediately and brought the aircraft back to the localizer and glide path with an increase in airspeed due to the descent to regain the glideslope. ATC queried as to whether we had the localizer and asked us to slow to 160 knots which we did immediately. The rest of the approach was normal.The Garmin 3000 has trouble capturing localizers at speeds over 150 knots. This weakness in the system should be addressed in training.
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Embraer Phenom 300 flight crew reported overshooting the localizer during approach due to the trouble the Garmin 3000 has at speeds over 150 knots. The aircraft was stabilized on the approach manually and speed was reduced to 160 knots per ATC.