An air carrier large transport crew climbed in response to a TCASII command. There was an air carrier inspector in the cockpit to witness the whole thing.

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Attributes
ACN	236184
Time
Date	199303
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : pvd
State Reference	RI
Altitude	msl bound lower : 11000 msl bound upper : 12000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zbw
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	enroute : on vectors
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 : instrument pilot : atp pilot : commercial pilot : flight engineer
Experience	flight time last 90 days : 150 flight time total : 13000 flight time type : 1000
ASRS Report	236184
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	flight crew : took evasive action flight crew : returned to intended course or assigned course
Miss Distance	horizontal : 5000 vertical : 1300
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Traffic called by approach control 12 O'clock -- 10500 swbound. No visual contact. TCASII target indicated 12 O'clock, 10700 ft. TCASII resolution to climb displayed. Aircraft climbed to 12000 ft. Aircraft sighted 11:30, approximately 1 mi. Advised ATC and descended back to 11000 ft. TCASII worked as designed. FAA air carrier inspector was on jump seat check riding crew.

Original NASA ASRS Text

Title: AN ACR LGT CREW CLBED IN RESPONSE TO A TCASII COMMAND. THERE WAS AN ACR INSPECTOR IN THE COCKPIT TO WITNESS THE WHOLE THING.

Narrative: TFC CALLED BY APCH CTL 12 O'CLOCK -- 10500 SWBOUND. NO VISUAL CONTACT. TCASII TARGET INDICATED 12 O'CLOCK, 10700 FT. TCASII RESOLUTION TO CLB DISPLAYED. ACFT CLBED TO 12000 FT. ACFT SIGHTED 11:30, APPROX 1 MI. ADVISED ATC AND DSNDED BACK TO 11000 FT. TCASII WORKED AS DESIGNED. FAA ACR INSPECTOR WAS ON JUMP SEAT CHK RIDING CREW.

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.