Air carrier receives TCASII RA to descend.

Attributes
ACN	223580
Time
Date	199210
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ptw
State Reference	PA
Altitude	msl bound lower : 11000 msl bound upper : 12000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute airway : zny
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 8000 flight time type : 2000
ASRS Report	223580
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

Climbing out from philadelphia, cleared to 16000 ft, and climbing through 11000 ft, we got a TCASII warning and descent command. Passing through 11500 we stopped climb and descended back to 11000. TCASII command stopped and traffic passed. Resumed climb to a reassigned altitude of 12000 ft. Traffic was confirmed at 12500 ft.

Original NASA ASRS Text

Title: ACR RECEIVES TCASII RA TO DSND.

Narrative: CLBING OUT FROM PHILADELPHIA, CLRED TO 16000 FT, AND CLBING THROUGH 11000 FT, WE GOT A TCASII WARNING AND DSCNT COMMAND. PASSING THROUGH 11500 WE STOPPED CLB AND DSNDED BACK TO 11000. TCASII COMMAND STOPPED AND TFC PASSED. RESUMED CLB TO A REASSIGNED ALT OF 12000 FT. TFC WAS CONFIRMED AT 12500 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.