EMB145 first officer experiences the autopilot switching from LNAV to roll mode as the aircraft pass...

Narrative:

On the drllr one arrival into iah. We were on the arrival with no issues until we hit domno. The arrival was loaded correctly into the FMS. When we hit domno the FMS was supposed to cycle us to vldez. The airplane started to make the turn but as soon as it did; it deactivated LNAV and went into roll mode. I immediately took corrective action by going into tcs mode and manually continuing the turn. We had a high tailwind so this delayed turn took us enough off course for ATC to ask us if we were in the turn. We advised them we had but we had an autopilot malfunction. Nothing was reported after that and the flight continued normally once we were back on course. We asked ATC if anyone else had the problem at domno and they said that three other company aircraft that day had the same issue. The biggest threat is flying these RNAV arrivals in our aircraft with avionics that are not capable of flying these arrivals. Our aircraft are too far out of date and should not be flying these. There was nothing that the pilot flying or pilot monitoring could have done in this instance since the issue didn't occur until when we were over the point. Upgrade our avionics.

Original NASA ASRS Text

Title: EMB145 First Officer experiences the autopilot switching from LNAV to roll mode as the aircraft passes DOMNO turning toward VLDEZ on the DRLLR 1 RNAV to IAH. ATC detects the track deviation and advises that previous company aircraft have had similar issues.

Narrative: On the DRLLR ONE arrival into IAH. We were on the arrival with no issues until we hit DOMNO. The arrival was loaded correctly into the FMS. When we hit DOMNO the FMS was supposed to cycle us to VLDEZ. The airplane started to make the turn but as soon as it did; it deactivated LNAV and went into roll mode. I immediately took corrective action by going into TCS mode and manually continuing the turn. We had a high tailwind so this delayed turn took us enough off course for ATC to ask us if we were in the turn. We advised them we had but we had an autopilot malfunction. Nothing was reported after that and the flight continued normally once we were back on course. We asked ATC if anyone else had the problem at DOMNO and they said that three other company aircraft that day had the same issue. The biggest threat is flying these RNAV arrivals in our aircraft with avionics that are not capable of flying these arrivals. Our aircraft are too far out of date and should not be flying these. There was nothing that the pilot flying or pilot monitoring could have done in this instance since the issue didn't occur until when we were over the point. Upgrade our avionics.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1179718
Time
Date	201406
Local Time Of Day	1201-1800
Place
Locale Reference	ZHU.ARTCC
State Reference	TX
Aircraft 1
Make Model Name	EMB ERJ 145 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	STAR DRLLR
Flight Plan	IFR
Component
Aircraft Component	Autopilot
Person 1
Function	First Officer Pilot Flying
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types Inflight Event / Encounter Weather / Turbulence

EMB145 first officer experiences the autopilot switching from LNAV to roll mode as the aircraft passes domno turning toward vldez on the drllr 1 RNAV to iah. ATC detects the track deviation and advises that previous company aircraft have had similar issues.