DHC8 overshoots clearance and conflicts with carj while under iad control.

Attributes
ACN	521502
Time
Date	200108
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : iad.tracon
State Reference	VA
Altitude	msl single value : 7000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : iad.tracon
Operator	common carrier : air carrier
Make Model Name	Dash 8 Series Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : intermediate altitude
Route In Use	arrival star : manne 4
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : iad.tracon
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65, Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	departure : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : supervisor
Experience	controller radar : 14 flight time total : 100
ASRS Report	521502
Person 2
Affiliation	government : faa
Function	controller : departure
Events
Anomaly	conflict : airborne less severe non adherence : clearance non adherence : published procedure other spatial deviation
Independent Detector	atc equipment other atc equipment : radar aircraft equipment : tcas other controllera
Resolutory Action	controller : issued new clearance flight crew : returned to intended or assigned course
Consequence	faa : investigated
Miss Distance	horizontal : 12000 vertical : 300
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Acting as controller in charge, departure sector called me over to be relieved for a possible pilot deviation. DH8 on STAR, rj on vectors. Apparently, DH8 was slightly off course. Controller caught it and took action as soon as she was aware the DH8 was off course. Supplemental information from acn 521820: we were on the manne 4 arrival into dca. Clearance was given to go direct to manne intersection, approximately 060 degree heading, and resume the arrival. Prior to reaching manne, I had selected the heading mode on the autoflt controller, also selected VOR to set up for the approach in use at dca. When I reselected the FMS, I didn't select the navigation mode again, so when passing the manne intersection, remained on the 060 degree heading. I noticed this when we were 1.8 mi past the course (1.8 mi northeast of course) and turned to 150 degree heading to rejoin the arrival course. Just after I started the turn, the approach controller told me to turn to 180 degree heading. The controller repeated this command saying it was for traffic. The copilot during this was on another radio checking in with dca operations. The copilot heard our TCASII system give a traffic alert and stated to me that traffic was no closer than the 2 mi ring on our TCASII panel and was 1100 ft above. We did not get an RA only a traffic alert, and turn commanded from ATC.

Original NASA ASRS Text

Title: DHC8 OVERSHOOTS CLRNC AND CONFLICTS WITH CARJ WHILE UNDER IAD CTL.

Narrative: ACTING AS CIC, DEP SECTOR CALLED ME OVER TO BE RELIEVED FOR A POSSIBLE PLTDEV. DH8 ON STAR, RJ ON VECTORS. APPARENTLY, DH8 WAS SLIGHTLY OFF COURSE. CTLR CAUGHT IT AND TOOK ACTION AS SOON AS SHE WAS AWARE THE DH8 WAS OFF COURSE. SUPPLEMENTAL INFO FROM ACN 521820: WE WERE ON THE MANNE 4 ARR INTO DCA. CLRNC WAS GIVEN TO GO DIRECT TO MANNE INTXN, APPROX 060 DEG HDG, AND RESUME THE ARR. PRIOR TO REACHING MANNE, I HAD SELECTED THE HDG MODE ON THE AUTOFLT CTLR, ALSO SELECTED VOR TO SET UP FOR THE APCH IN USE AT DCA. WHEN I RESELECTED THE FMS, I DIDN'T SELECT THE NAV MODE AGAIN, SO WHEN PASSING THE MANNE INTXN, REMAINED ON THE 060 DEG HDG. I NOTICED THIS WHEN WE WERE 1.8 MI PAST THE COURSE (1.8 MI NE OF COURSE) AND TURNED TO 150 DEG HDG TO REJOIN THE ARR COURSE. JUST AFTER I STARTED THE TURN, THE APCH CTLR TOLD ME TO TURN TO 180 DEG HDG. THE CTLR REPEATED THIS COMMAND SAYING IT WAS FOR TFC. THE COPLT DURING THIS WAS ON ANOTHER RADIO CHKING IN WITH DCA OPS. THE COPLT HEARD OUR TCASII SYS GIVE A TFC ALERT AND STATED TO ME THAT TFC WAS NO CLOSER THAN THE 2 MI RING ON OUR TCASII PANEL AND WAS 1100 FT ABOVE. WE DID NOT GET AN RA ONLY A TFC ALERT, AND TURN COMMANDED FROM ATC.

Data retrieved from NASA's ASRS site as of July 2007 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.