E145 crew had less than legal separation on approach at dfw.

Attributes
ACN	448017
Time
Date	199908
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : dfw.airport
State Reference	TX
Altitude	msl bound lower : 3000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : d10.tracon
Operator	common carrier : air carrier
Make Model Name	EMB ERJ 145 ER&LR
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer only : 17c
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tracon : d10.tracon
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Navigation In Use	ils localizer & glide slope : 17l
Flight Phase	descent : approach
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : multi engine
Experience	flight time last 90 days : 180 flight time total : 16800 flight time type : 750
ASRS Report	448017
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	conflict : airborne less severe non adherence : clearance non adherence : required legal separation other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	flight crew : became reoriented flight crew : returned to intended or assigned course
Miss Distance	vertical : 700
Supplementary
Problem Areas	Flight Crew Human Performance Airport
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were on a left base for runway 17C at dfw. Approach told us to resume our own navigation to runway 17C but maintain 4000 ft. There was traffic passing from right to left below us at 3000 ft on final to runway 17L. We reported the traffic in sight and approach deleted our altitude restr, cleared us for the visual approach to runway 17C, and asked us to keep our speed up. First officer was flying. He was new in the aircraft and I was helping him to slow down, and get down. As I looked up it appeared he was turning in too soon for runway 17C and in fact we had runway 17L in sight. As I helped him maneuver for runway 17C approach called and said we were lining up on runway 17L and we needed to turn right and join the final for runway 17C. We were descending on top of the aircraft below us on final for runway 17L. TCASII showed us 700 ft above that aircraft as we turned away. Things get really busy when flying in busy airspace, with a new first officer, your performing non-flying duties, and helping the first officer configure and fly the aircraft.

Original NASA ASRS Text

Title: E145 CREW HAD LESS THAN LEGAL SEPARATION ON APCH AT DFW.

Narrative: WE WERE ON A L BASE FOR RWY 17C AT DFW. APCH TOLD US TO RESUME OUR OWN NAV TO RWY 17C BUT MAINTAIN 4000 FT. THERE WAS TFC PASSING FROM R TO L BELOW US AT 3000 FT ON FINAL TO RWY 17L. WE RPTED THE TFC IN SIGHT AND APCH DELETED OUR ALT RESTR, CLRED US FOR THE VISUAL APCH TO RWY 17C, AND ASKED US TO KEEP OUR SPD UP. FO WAS FLYING. HE WAS NEW IN THE ACFT AND I WAS HELPING HIM TO SLOW DOWN, AND GET DOWN. AS I LOOKED UP IT APPEARED HE WAS TURNING IN TOO SOON FOR RWY 17C AND IN FACT WE HAD RWY 17L IN SIGHT. AS I HELPED HIM MANEUVER FOR RWY 17C APCH CALLED AND SAID WE WERE LINING UP ON RWY 17L AND WE NEEDED TO TURN R AND JOIN THE FINAL FOR RWY 17C. WE WERE DSNDING ON TOP OF THE ACFT BELOW US ON FINAL FOR RWY 17L. TCASII SHOWED US 700 FT ABOVE THAT ACFT AS WE TURNED AWAY. THINGS GET REALLY BUSY WHEN FLYING IN BUSY AIRSPACE, WITH A NEW FO, YOUR PERFORMING NON-FLYING DUTIES, AND HELPING THE FO CONFIGURE AND FLY THE ACFT.

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.