Emb-135 captain reports that the autopilot failed to turn over the domno fix as programmed; during t...

Attributes
ACN	1188003
Time
Date	201407
Local Time Of Day	1201-1800
Place
Locale Reference	IAH.Airport
State Reference	TX
Aircraft 1
Make Model Name	EMB ERJ 135 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	STAR DRLLR 1
Flight Plan	IFR
Component
Aircraft Component	FMS/FMC
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types

Narrative:

Inbound on the drllr 1 arrival into houston the FMS/autopilot failed to sequence past the domno fix. When reaching this fix; the plane automatically disengaged LNAV and went into basic roll mode instead of making the required turn. Right as this happened I turned the plane back to intercept the arrival and my first officer re-engaged the nav function of the autopilot and we reintercepted the arrival. Had we both not been watching the airplane that closely we could've had a fairly significant deviation at a lower altitude over the top of a busy airport. As it was; as houston approach called to verify that we were making the turn; we were already in the turn back to course. Approaching that point there was not a single sign in the flight plan or the FMS or on the course depiction on the nd that the airplane would not make a turn as expected.

Original NASA ASRS Text

Title: EMB-135 Captain reports that the autopilot failed to turn over the DOMNO fix as programmed; during the DRLLR 1 RNAV arrival to IAH. The deviation is immediately detected and corrected.

Narrative: Inbound on the DRLLR 1 arrival into Houston the FMS/autopilot failed to sequence past the DOMNO fix. When reaching this fix; the plane automatically disengaged LNAV and went into basic roll mode instead of making the required turn. Right as this happened I turned the plane back to intercept the arrival and my First Officer re-engaged the nav function of the autopilot and we reintercepted the arrival. Had we both not been watching the airplane that closely we could've had a fairly significant deviation at a lower altitude over the top of a busy airport. As it was; as Houston Approach called to verify that we were making the turn; we were already in the turn back to course. Approaching that point there was not a single sign in the flight plan or the FMS or on the course depiction on the ND that the airplane would not make a turn as expected.

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.

Emb-135 captain reports that the autopilot failed to turn over the domno fix as programmed; during the drllr 1 RNAV arrival to iah. The deviation is immediately detected and corrected.