Near midair collision. TCASII.

Attributes
ACN	315589
Time
Date	199509
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : dtw
State Reference	MI
Altitude	msl bound lower : 12000 msl bound upper : 13000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B727-200
Operating Under FAR Part	Part 121
Flight Phase	cruise other descent other
Route In Use	arrival other arrival star : star enroute airway : zob
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Gates Learjet Corp Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	cruise other descent other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : atp pilot : commercial
Experience	flight time last 90 days : 200 flight time total : 21000 flight time type : 5000
ASRS Report	315589
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	conflict : nmac other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 1500 vertical : 0

Narrative:

Near midair collision: VFR learjet descended in front of us, 12000 ft, momentarily leveling at our altitude, horizontal clearance about 1500 ft. RA received on TCASII requiring a climb up to 13000 ft. ATC had no joy until aircraft was about 1/4 mi. We saw the lear at about the same time it appeared on TCASII. ATC advised of RA compliance. We suspect the lear was headed for willow run airport.

Original NASA ASRS Text

Title: NMAC. TCASII.

Narrative: NMAC: VFR LEARJET DSNDED IN FRONT OF US, 12000 FT, MOMENTARILY LEVELING AT OUR ALT, HORIZ CLRNC ABOUT 1500 FT. RA RECEIVED ON TCASII REQUIRING A CLB UP TO 13000 FT. ATC HAD NO JOY UNTIL ACFT WAS ABOUT 1/4 MI. WE SAW THE LEAR AT ABOUT THE SAME TIME IT APPEARED ON TCASII. ATC ADVISED OF RA COMPLIANCE. WE SUSPECT THE LEAR WAS HEADED FOR WILLOW RUN ARPT.

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.