A300 pilot reported ATC questioned the course when the aircraft led the turn prior to a waypoint.

Attributes
ACN	1516563
Time
Date	201802
Local Time Of Day	1801-2400
Place
Locale Reference	BWI.Airport
State Reference	MD
Aircraft 1
Make Model Name	A300
Operating Under FAR Part	Part 121
Flight Phase	Climb
Route In Use	SID TERPZ6
Flight Plan	IFR
Person 1
Function	Flight Engineer / Second Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	ATC Issue All Types Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types

Narrative:

We were assigned and flying the TERPZ6.ramay. Soon after we passed wonce; the airplane started to lead the turn to foxhl. Since terpz is not a flyover point the FMC course took us about 4 NM from the fix while our course deviation indicated that we were 0.0 NM off course.ATC asked where we were headed; he seemed to indicate that we were not looking to be on course. She mentioned that this happens frequently.is this a problem related to the database or is something that ATC just has to expect and anticipate?

Original NASA ASRS Text

Title: A300 pilot reported ATC questioned the course when the aircraft led the turn prior to a waypoint.

Narrative: We were assigned and flying the TERPZ6.RAMAY. Soon after we passed WONCE; the airplane started to lead the turn to FOXHL. Since TERPZ is not a flyover point the FMC course took us about 4 NM from the fix while our course deviation indicated that we were 0.0 NM off course.ATC asked where we were headed; he seemed to indicate that we were not looking to be on course. She mentioned that this happens frequently.Is this a problem related to the database or is something that ATC just has to expect and anticipate?

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.