An air carrier medium large transport climbed in response to a TCASII command.

Attributes
ACN	229178
Time
Date	199212
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lan
State Reference	MI
Altitude	msl bound lower : 8000 msl bound upper : 8500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute airway : zob
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 14000
ASRS Report	229178
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : instrument
Experience	flight time last 90 days : 210 flight time total : 10000 flight time type : 4000
ASRS Report	229320
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance other anomaly other
Independent Detector	other controllera other flight crewa other other : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 0 vertical : 800
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While cruising at 8000 ft, ZOB advised of VFR traffic at 11 O'clock, 3 mi. Simultaneously, our TCASII TA turned to an RA to 'climb.' in accordance, a climb was initiated and ATC informed. Traffic passed directly under with a vertical separation of about 800 ft. We returned to 8000 ft and advised ATC. Supplemental information from acn 229320: vertical separation was about 800 ft. This included a 500 ft climb by our aircraft to 8500 ft MSL.

Original NASA ASRS Text

Title: AN ACR MLG CLBED IN RESPONSE TO A TCASII COMMAND.

Narrative: WHILE CRUISING AT 8000 FT, ZOB ADVISED OF VFR TFC AT 11 O'CLOCK, 3 MI. SIMULTANEOUSLY, OUR TCASII TA TURNED TO AN RA TO 'CLB.' IN ACCORDANCE, A CLB WAS INITIATED AND ATC INFORMED. TFC PASSED DIRECTLY UNDER WITH A VERT SEPARATION OF ABOUT 800 FT. WE RETURNED TO 8000 FT AND ADVISED ATC. SUPPLEMENTAL INFO FROM ACN 229320: VERT SEPARATION WAS ABOUT 800 FT. THIS INCLUDED A 500 FT CLB BY OUR ACFT TO 8500 FT MSL.

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.