Potential conflict resolved by TCASII RA.

Attributes
ACN	271780
Time
Date	199405
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : cmh
State Reference	OH
Altitude	msl bound lower : 2700 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cmh
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other cruise other descent : approach
Route In Use	approach : visual enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	other : unknown
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 6000 flight time type : 3000
ASRS Report	271780
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 100 flight time total : 6000 flight time type : 25
ASRS Report	271577
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 3000 vertical : 500
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

While receiving vectors for a visual approach to 10R at cmh, ATC advised of traffic at our altitude and 2 O'clock. Further vectors put the traffic at 12 O'clock and 3 mi at our altitude. We advised ATC that we had negative contact. We were then advised of additional traffic at 11 O'clock being vectored for 10L at 3000 MSL. Again we advised ATC that we were negative contact on both targets. At this point we had a TA on the first target, which now became an RA with a 'descend' command. We advised ATC we were descending due to the RA. Supplemental information from acn 271577: followed RA commands to avoid aircraft. Deviation from altitude. About 1800 FPM descent from 3700 ft to about 2700 ft.

Original NASA ASRS Text

Title: POTENTIAL CONFLICT RESOLVED BY TCASII RA.

Narrative: WHILE RECEIVING VECTORS FOR A VISUAL APCH TO 10R AT CMH, ATC ADVISED OF TFC AT OUR ALT AND 2 O'CLOCK. FURTHER VECTORS PUT THE TFC AT 12 O'CLOCK AND 3 MI AT OUR ALT. WE ADVISED ATC THAT WE HAD NEGATIVE CONTACT. WE WERE THEN ADVISED OF ADDITIONAL TFC AT 11 O'CLOCK BEING VECTORED FOR 10L AT 3000 MSL. AGAIN WE ADVISED ATC THAT WE WERE NEGATIVE CONTACT ON BOTH TARGETS. AT THIS POINT WE HAD A TA ON THE FIRST TARGET, WHICH NOW BECAME AN RA WITH A 'DSND' COMMAND. WE ADVISED ATC WE WERE DSNDING DUE TO THE RA. SUPPLEMENTAL INFO FROM ACN 271577: FOLLOWED RA COMMANDS TO AVOID ACFT. DEV FROM ALT. ABOUT 1800 FPM DSCNT FROM 3700 FT TO ABOUT 2700 FT.

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.