<< >> NASA ASRS Report 852952, September 2009

Air carrier on approach to dfw experienced TCAS TA/RA at approximately 3000 ft with unreported and unseen traffic.

Attributes
ACN	852952
Time
Date	200909
Local Time Of Day	1201-1800
Place
Locale Reference	DFW.Airport
State Reference	TX
Aircraft 1
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Plan	IFR
Person 1
Function	Pilot Flying First Officer
Person 2
Function	Captain Pilot Not Flying
Events
Anomaly	Conflict NMAC Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance
Miss Distance	Horizontal 200

Narrative:

First officer (me) was flying leg to dfw. Approximately 15 minutes southwest of dfw; we were cleared to turn from 030 to 010 direct huten; descend and maintain 3000 ft until established and cleared ILS 36L at dfw. We were IMC. We noted an intruder aircraft on TCAS approximate 5000 ft below our altitude and on a converging course. We continued and monitored. Received a TA followed by a 'monitor vertical speed;' followed by an RA 'climb.' I executed the TCAS RA procedures and began to climb until we received 'clear of conflict.' leveled at approximately 3500 ft. Captain notified ATC that we were responding to an RA. Approach then recleared us for the approach which we completed without further incident. TCAS showed us within 200 ft cpa of intruder aircraft. Neither of us heard any ATC report of the traffic prior to the RA. Captain called approach upon arrival and notified dispatch. We both submitted reports.

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Original NASA ASRS Text

Title: Air carrier on approach to DFW experienced TCAS TA/RA at approximately 3000 FT with unreported and unseen traffic.

Narrative: First Officer (me) was flying leg to DFW. Approximately 15 minutes southwest of DFW; we were cleared to turn from 030 to 010 direct HUTEN; descend and maintain 3000 FT until established and cleared ILS 36L at DFW. We were IMC. We noted an intruder aircraft on TCAS approximate 5000 FT below our altitude and on a converging course. We continued and monitored. Received a TA followed by a 'monitor vertical speed;' followed by an RA 'climb.' I executed the TCAS RA procedures and began to climb until we received 'clear of conflict.' Leveled at approximately 3500 FT. Captain notified ATC that we were responding to an RA. Approach then recleared us for the approach which we completed without further incident. TCAS showed us within 200 FT CPA of intruder aircraft. Neither of us heard any ATC report of the traffic prior to the RA. Captain called Approach upon arrival and notified Dispatch. We both submitted reports.

Data retrieved from NASA's ASRS site as of April 2012 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.