What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
On Sunday April 29th 2018, at approximately 0900 EST, an air Wisconsin CL600-2B19, N467AW operating as united express flight number UA3890 departing from kday (dayton international airport) to kord ( chicago o?hare international airport) diverted to kind (Indianapolis international airport) due to a flight control anomaly.
According to a narrative report from the PIC, the aircraft initially experienced uncommanded yaw which resulted in an auto pilot disconnect. The flight crew accomplished qrh procedures and disengaged the yaw damper system. The aircraft continued to experience mild to violent yaw movements until landing. A review of simillar event from the operator reveals that the aircraft has a propensity to dutch roll upon loosing the yaw damper system. No action required on airmen.
Reviewed maintenance action. The following items were removed and replaced; the integrated avionics processing systems (iaps) cage assembly, iaps IOC2B card, flight control computer (fcc) 2, flight control panel (fcp) and the yaw damper 1 & 2.
After removal and replacement of the listed components, a spin test of the aileron auto pilot servo failed. The aircraft was deemed non rvsm and the affected system placed on MEL. The aircraft was released airworthy to continue service.
As the FAA filed it
ON SUNDAY APRIL 29TH 2018, AT APPROXIMATELY 0900 EST, AN AIR WISCONSIN CL600-2B19, N467AW OPERATING AS UNITED EXPRESS FLIGHT NUMBER UA3890 DEPARTING FROM KDAY (DAYTON INTERNATIONAL AIRPORT) TO KORD ( CHICAGO O?HARE INTERNATIONAL AIRPORT) DIVERTED TO KIND (INDIANAPOLIS INTERNATIONAL AIRPORT) DUE TO A FLIGHT CONTROL ANOMALY.
ACCORDING TO A NARRATIVE REPORT FROM THE PIC, THE AIRCRAFT INITIALLY EXPERIENCED UNCOMMANDED YAW WHICH RESULTED IN AN AUTO PILOT DISCONNECT. THE FLIGHT CREW ACCOMPLISHED QRH PROCEDURES AND DISENGAGED THE YAW DAMPER SYSTEM. THE AIRCRAFT CONTINUED TO EXPERIENCE MILD TO VIOLENT YAW MOVEMENTS UNTIL LANDING. A REVIEW OF SIMILLAR EVENT FROM THE OPERATOR REVEALS THAT THE AIRCRAFT HAS A PROPENSITY TO DUTCH ROLL UPON LOOSING THE YAW DAMPER SYSTEM. NO ACTION REQUIRED ON AIRMEN.
REVIEWED MAINTENANCE ACTION.THE FOLLOWING ITEMS WERE REMOVED AND REPLACED; THE INTEGRATED AVIONICS PROCESSING SYSTEMS (IAPS) CAGE ASSEMBLY, IAPS IOC2B CARD, FLIGHT CONTROL COMPUTER (FCC) 2, FLIGHT CONTROL PANEL (FCP) AND THE YAW DAMPER 1 & 2.
AFTER REMOVAL AND REPLACEMENT OF THE LISTED COMPONENTS, A SPIN TEST OF THE AILERON AUTO PILOT SERVO FAILED. THE AIRCRAFT WAS DEEMED NON RVSM AND THE AFFECTED SYSTEM PLACED ON MEL. THE AIRCRAFT WAS RELEASED AIRWORTHY TO CONTINUE SERVICE.
Other reports on N467AW · 2
Matched to the same aircraft by N-number and date.