System error occurs when dfw tower controller crosses S80's flight path with a rotary winged aircraft on the final approach course to runway 35C at dfw, tx.

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Attributes
ACN	494960
Time
Date	200012
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : dfw.airport
State Reference	TX
Altitude	msl single value : 1200
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : dfw.tower
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Navigation In Use	ils localizer & glide slope : 35c
Flight Phase	descent : vacating altitude
Route In Use	approach : instrument precision approach : visual
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : dfw.tower
Make Model Name	Helicopter
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Route In Use	departure : vfr
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
ASRS Report	494960
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : nmac non adherence : far non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment : tcas other controllera
Resolutory Action	controller : issued advisory flight crew : took precautionary avoidance action
Consequence	faa : reviewed incident with flight crew other
Miss Distance	horizontal : 0 vertical : 400
Supplementary
Problem Areas	Flight Crew Human Performance Airspace Structure ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Location: 2 mi from landing/approach. As first officer, I was flying and we were cleared on a night visual approach to runway 35C, dfw. Tower reported that a helicopter was passing ahead and below and that the helicopter had us in sight. We did not have the helicopter in sight. At approximately 1200 ft MSL, and on the runway 35C ILS GS, we got RA 'monitor vertical speed.' captain said traffic was not insight, and I responded to the RA. Captain said that TCASII showed closest separation of 400 ft. Once clear of traffic, we continued and landed uneventfully. On rollout, I informed tower that we experienced an RA. Tower asked if we had heard his TA, and I responded affirmative.

Original NASA ASRS Text

Title: SYS ERROR OCCURS WHEN DFW TWR CTLR CROSSES S80'S FLT PATH WITH A ROTARY WINGED ACFT ON THE FINAL APCH COURSE TO RWY 35C AT DFW, TX.

Narrative: LOCATION: 2 MI FROM LNDG/APCH. AS FO, I WAS FLYING AND WE WERE CLRED ON A NIGHT VISUAL APCH TO RWY 35C, DFW. TWR RPTED THAT A HELI WAS PASSING AHEAD AND BELOW AND THAT THE HELI HAD US IN SIGHT. WE DID NOT HAVE THE HELI IN SIGHT. AT APPROX 1200 FT MSL, AND ON THE RWY 35C ILS GS, WE GOT RA 'MONITOR VERT SPD.' CAPT SAID TFC WAS NOT INSIGHT, AND I RESPONDED TO THE RA. CAPT SAID THAT TCASII SHOWED CLOSEST SEPARATION OF 400 FT. ONCE CLR OF TFC, WE CONTINUED AND LANDED UNEVENTFULLY. ON ROLLOUT, I INFORMED TWR THAT WE EXPERIENCED AN RA. TWR ASKED IF WE HAD HEARD HIS TA, AND I RESPONDED AFFIRMATIVE.

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.