ATC advised an A300 crew on the dfw soldo 2 FMS departure they had executed the turn to mavvs early....

Attributes
ACN	682365
Time
Date	200512
Place
Locale Reference	airport : dfw.airport
State Reference	TX
Altitude	agl single value : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : d10.tracon
Operator	common carrier : air carrier
Make Model Name	A300
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : takeoff climbout : initial
Route In Use	departure sid : soldo
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 90 flight time total : 7500 flight time type : 2050
ASRS Report	682365
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 150 flight time total : 15300 flight time type : 1526
ASRS Report	682373
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance non adherence : published procedure non adherence : far other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued advisory none taken : detected after the fact
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Aircraft ATC Human Performance Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

Preflight preparation for the soldo 2 was complete and all system were operating normally. GPS was primary and the toga switches were initiated on takeoff. The autoplt was engaged at 1000 ft AGL and the FMS showed the aircraft directly on course with zero deviation on the navigation display throughout the departure. Approaching mechl; the aircraft initiated its turn to mavvs prior to mechl but on the course displayed on the navigation display the points all show to be fly-by; not fly-over points on the SID. Again; the aircraft was on the FMS-generated course displayed on the navigation display. The closest point of intercept to mechl was 1.7 DME on the navigation display. Into the turn; departure queried if we were flying the SID. We responded that we were; and again confirmed that we were on track on the navigation display with no degradation of any system status. Departure then commented that it looked like we early turned mechl. Again; we confirmed that we were on the FMS-generated path. The departure controller then said he was going to write us up. The aircraft continued to navigation the SID without any deviations or events or system degradations. Callback conversation with reporter revealed the following information: reporter stated that he was acting as the PF on this departure. ATC notified them they had turned early. This reporter has been flying this departure for nearly 2 months exactly the same and this first comment is the first he's heard about early turns.

Original NASA ASRS Text

Title: ATC ADVISED AN A300 CREW ON THE DFW SOLDO 2 FMS DEP THEY HAD EXECUTED THE TURN TO MAVVS EARLY. RPTR CONFIRMED THE FMS WAS FLYING AS DIRECTED.

Narrative: PREFLT PREPARATION FOR THE SOLDO 2 WAS COMPLETE AND ALL SYS WERE OPERATING NORMALLY. GPS WAS PRIMARY AND THE TOGA SWITCHES WERE INITIATED ON TKOF. THE AUTOPLT WAS ENGAGED AT 1000 FT AGL AND THE FMS SHOWED THE ACFT DIRECTLY ON COURSE WITH ZERO DEV ON THE NAV DISPLAY THROUGHOUT THE DEP. APCHING MECHL; THE ACFT INITIATED ITS TURN TO MAVVS PRIOR TO MECHL BUT ON THE COURSE DISPLAYED ON THE NAV DISPLAY THE POINTS ALL SHOW TO BE FLY-BY; NOT FLY-OVER POINTS ON THE SID. AGAIN; THE ACFT WAS ON THE FMS-GENERATED COURSE DISPLAYED ON THE NAV DISPLAY. THE CLOSEST POINT OF INTERCEPT TO MECHL WAS 1.7 DME ON THE NAV DISPLAY. INTO THE TURN; DEP QUERIED IF WE WERE FLYING THE SID. WE RESPONDED THAT WE WERE; AND AGAIN CONFIRMED THAT WE WERE ON TRACK ON THE NAV DISPLAY WITH NO DEGRADATION OF ANY SYS STATUS. DEP THEN COMMENTED THAT IT LOOKED LIKE WE EARLY TURNED MECHL. AGAIN; WE CONFIRMED THAT WE WERE ON THE FMS-GENERATED PATH. THE DEP CTLR THEN SAID HE WAS GOING TO WRITE US UP. THE ACFT CONTINUED TO NAV THE SID WITHOUT ANY DEVS OR EVENTS OR SYS DEGRADATIONS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT HE WAS ACTING AS THE PF ON THIS DEP. ATC NOTIFIED THEM THEY HAD TURNED EARLY. THIS RPTR HAS BEEN FLYING THIS DEP FOR NEARLY 2 MONTHS EXACTLY THE SAME AND THIS FIRST COMMENT IS THE FIRST HE'S HEARD ABOUT EARLY TURNS.

Data retrieved from NASA's ASRS site as of January 2009 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.

ATC advised an A300 crew on the dfw soldo 2 FMS departure they had executed the turn to mavvs early. Reporter confirmed the FMS was flying as directed.