Close proximity air carrier-medium large transport GA-small transport of dwf.

Attributes
ACN	187288
Time
Date	199108
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	msl bound lower : 12200 msl bound upper : 13000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dfw
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	cruise other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 220 flight time total : 8000 flight time type : 1800
ASRS Report	187288
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	conflict : nmac
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 500 vertical : 200
Supplementary
Primary Problem	Flight Crew Human Performance

Narrative:

The copilot saw the other aircraft first at 12 O'clock position and slightly above our altitude. We were heading 345 degrees and the other aircraft was heading southwest. The other aircraft passed by our left wing as we reacted. No evasive action was taken by us as the danger was over as we took the controls. No injuries on board our aircraft. The other aircraft was a twin small transport. A TCAS was installed on our aircraft and was operating in the TA/RA mode. No warning was given by the TCAS until the other aircraft passed our left wing. The TCAS then gave a TA alert and the audio said 'traffic' one time. I looked at the display and it showed a yellow DOT at the 9 O'clock position with a plus 800 indication. No RA was given by the TCAS. The display indicted we were in the TA/RA mode. The copilot and I both believe the other aircraft was less than 800 ft above us. I looked to the left as the aircraft passed and it appeared to be at our altitude and about 500 ft laterally. We asked ATC about the traffic. The controller said he did not show the twin small transport on his radar. We filed a near midair collision report with ATC.

Original NASA ASRS Text

Title: CLOSE PROX ACR-MLG GA-SMT OF DWF.

Narrative: THE COPLT SAW THE OTHER ACFT FIRST AT 12 O'CLOCK POS AND SLIGHTLY ABOVE OUR ALT. WE WERE HDG 345 DEGS AND THE OTHER ACFT WAS HDG SW. THE OTHER ACFT PASSED BY OUR L WING AS WE REACTED. NO EVASIVE ACTION WAS TAKEN BY US AS THE DANGER WAS OVER AS WE TOOK THE CTLS. NO INJURIES ON BOARD OUR ACFT. THE OTHER ACFT WAS A TWIN SMT. A TCAS WAS INSTALLED ON OUR ACFT AND WAS OPERATING IN THE TA/RA MODE. NO WARNING WAS GIVEN BY THE TCAS UNTIL THE OTHER ACFT PASSED OUR L WING. THE TCAS THEN GAVE A TA ALERT AND THE AUDIO SAID 'TFC' ONE TIME. I LOOKED AT THE DISPLAY AND IT SHOWED A YELLOW DOT AT THE 9 O'CLOCK POS WITH A PLUS 800 INDICATION. NO RA WAS GIVEN BY THE TCAS. THE DISPLAY INDICTED WE WERE IN THE TA/RA MODE. THE COPLT AND I BOTH BELIEVE THE OTHER ACFT WAS LESS THAN 800 FT ABOVE US. I LOOKED TO THE L AS THE ACFT PASSED AND IT APPEARED TO BE AT OUR ALT AND ABOUT 500 FT LATERALLY. WE ASKED ATC ABOUT THE TFC. THE CTLR SAID HE DID NOT SHOW THE TWIN SMT ON HIS RADAR. WE FILED A NMAC RPT WITH 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.