EMB ERJ 145 ER/LR
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Confusion; Troubleshooting
Aircraft Equipment Problem Less Severe; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew FLC Overrode Automation
Aircraft; Company Policy; Human Factors
On the DRLLR5 Arrival into IAH the aircraft went into a roll mode configuration at DOMNO; displaced the NAV mode and maintained its course on the RNAV arrival without turning to the next fix (SKLER). I immediately went on heading mode; turned the aircraft towards SKLER the next fix on the RNAV and my First Officer updated the aircraft simultaneously towards the next fix (SKLER). A few seconds later; the controller asked us if were making a turn towards the next fix. We replied yes and continued the flight on the arrival. The event took less than 10 seconds. Once heading in the right direction we then re-engaged NAV mode and continued on the arrival with no further incidents. This incident has been very frequent on our airplanes on the same Arrival on the final turn on the arrival; we followed every single procedure on our SOPs and training bulletin by double checking our fixes to make sure we had no duplicates and by waiting till we get a runway assignment before we load any runway on the FMS; still we still had the same issue.On landing at IAH the tower control advised us of a possible pilot deviation and issued us a phone number; after the flight on our debrief we then concluded it will be wise to submit an incident report. Since we followed every single procedure and training bulletin and still ran into the same issue; my suggestion is for the company to find out why the FMS and autopilot keep getting confused at this fixes; for the mean time I will always be ready and alert on this said arrivals and fixes to reduce or completely eliminate any deviation.
Embraer Captain reported a malfunction indicated by the aircraft auto flight system switching from the NAV mode to the ROLL mode causing a track deviation on the DRLLR FIVE STAR into IAH.