Flight crew of air carrier large transport aircraft took evasive action in response to a TCASII RA.

Attributes
ACN	227775
Time
Date	199211
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : aqn airport : dfw
State Reference	TX
Altitude	msl bound lower : 11000 msl bound upper : 11700
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : dfw
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	descent : approach descent other
Route In Use	arrival other arrival star : star enroute airway : dfw
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : private pilot : atp
Experience	flight time last 90 days : 100 flight time total : 7000 flight time type : 2800
ASRS Report	227775
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Miss Distance	vertical : 1500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

While level at 11000 ft on arrival into dfw, approach control called out traffic climbing out of 8000 ft to 10000 ft. Our TCASII picked up the climbing aircraft as a threat and issued an RA of 'climb.' our response to the RA was to momentarily climb from 11000 ft to 11700 ft. We immediately notified ATC. Our FAA approved operating manual states, 'when TCASII issues an RA the pilot must always maneuver the airplane per TCASII instructions even when in visual contact with a target.' I feel very uncomfortable deviating from an assigned altitude in a TCA!

Original NASA ASRS Text

Title: FLC OF ACR LGT ACFT TOOK EVASIVE ACTION IN RESPONSE TO A TCASII RA.

Narrative: WHILE LEVEL AT 11000 FT ON ARR INTO DFW, APCH CTL CALLED OUT TFC CLBING OUT OF 8000 FT TO 10000 FT. OUR TCASII PICKED UP THE CLBING ACFT AS A THREAT AND ISSUED AN RA OF 'CLB.' OUR RESPONSE TO THE RA WAS TO MOMENTARILY CLB FROM 11000 FT TO 11700 FT. WE IMMEDIATELY NOTIFIED ATC. OUR FAA APPROVED OPERATING MANUAL STATES, 'WHEN TCASII ISSUES AN RA THE PLT MUST ALWAYS MANEUVER THE AIRPLANE PER TCASII INSTRUCTIONS EVEN WHEN IN VISUAL CONTACT WITH A TARGET.' I FEEL VERY UNCOMFORTABLE DEVIATING FROM AN ASSIGNED ALT IN A TCA!

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.