TCASII alert between air carrier a and ukn B.

Attributes
ACN	280695
Time
Date	199408
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mai
State Reference	FL
Altitude	msl bound lower : 11000 msl bound upper : 14200
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zjk
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Flight Phase	climbout : intermediate altitude cruise other
Flight Plan	VFR
Person 1
Affiliation	government : faa
Qualification	controller : radar
Experience	controller radar : 2
ASRS Report	280695
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : instrument
Events
Anomaly	conflict : airborne less severe
Independent Detector	other controllera other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 0
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Air carrier a en route to pfn, was assigned a southwest heading around an MOA - - I advised air carrier a of high speed eastbound traffic on V198 indication 11500 ft VFR. Air carrier a was cleared to maintain 12000 ft. Air carrier a advised he 'had' the unknown 'on TCASII.' unknown, ukn B began rapid climb. Air carrier a advised center as I also notice climb, and cleared air carrier a to 'maneuver as necessary' and suggested right turn. Air carrier a advised turning right, and I provided continuous updates of altitude on unknown. Air carrier a advised TCASII RA, climb and right turn.I elected to issue only TA's once air carrier a reported he 'had him on TCASII.' I felt his radar was now more accurate than my own, and absent other traffic gave him carte blanche to maneuver. While the right turn was as I had advised, the climb surprised me.

Original NASA ASRS Text

Title: TCASII ALERT BTWN ACR A AND UKN B.

Narrative: ACR A ENRTE TO PFN, WAS ASSIGNED A SW HDG AROUND AN MOA - - I ADVISED ACR A OF HIGH SPD EBOUND TFC ON V198 INDICATION 11500 FT VFR. ACR A WAS CLRED TO MAINTAIN 12000 FT. ACR A ADVISED HE 'HAD' THE UNKNOWN 'ON TCASII.' UNKNOWN, UKN B BEGAN RAPID CLB. ACR A ADVISED CTR AS I ALSO NOTICE CLB, AND CLRED ACR A TO 'MANEUVER AS NECESSARY' AND SUGGESTED R TURN. ACR A ADVISED TURNING R, AND I PROVIDED CONTINUOUS UPDATES OF ALT ON UNKNOWN. ACR A ADVISED TCASII RA, CLB AND R TURN.I ELECTED TO ISSUE ONLY TA'S ONCE ACR A RPTED HE 'HAD HIM ON TCASII.' I FELT HIS RADAR WAS NOW MORE ACCURATE THAN MY OWN, AND ABSENT OTHER TFC GAVE HIM CARTE BLANCHE TO MANEUVER. WHILE THE R TURN WAS AS I HAD ADVISED, THE CLB SURPRISED ME.

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.