Flight crew of large transport air carrier aircraft climbed above descent assigned altitude in respo...

Attributes
ACN	248902
Time
Date	199307
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ard
State Reference	PA
Altitude	msl bound lower : 11700 msl bound upper : 12000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent other
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	descent other
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 3060 flight time type : 500
ASRS Report	248902
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : nmac other anomaly other
Independent Detector	other flight crewa other other : unspecified cockpit
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Miss Distance	vertical : 300
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

Approaching yardley VOR at 11000 ft we received a TCASII TA at 12 O'clock and 1000 ft above descending. That was followed by an RA: 'traffic climb' warning. We climbed at 2000 FPM to 12000 ft. ATC (132.52) then advised us of unknown traffic and then confirmed it had descended through our assigned altitude. We were IMC. Thank goodness for TCASII!

Original NASA ASRS Text

Title: FLC OF LGT ACR ACFT CLBED ABOVE DSCNT ASSIGNED ALT IN RESPONSE TO A TCASII RA.

Narrative: APCHING YARDLEY VOR AT 11000 FT WE RECEIVED A TCASII TA AT 12 O'CLOCK AND 1000 FT ABOVE DSNDING. THAT WAS FOLLOWED BY AN RA: 'TFC CLB' WARNING. WE CLBED AT 2000 FPM TO 12000 FT. ATC (132.52) THEN ADVISED US OF UNKNOWN TFC AND THEN CONFIRMED IT HAD DSNDED THROUGH OUR ASSIGNED ALT. WE WERE IMC. THANK GOODNESS FOR TCASII!

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.

Flight crew of large transport air carrier aircraft climbed above descent assigned altitude in response to a TCASII RA.