An air carrier light transport climbed in response to a command from TCASII.

Attributes
ACN	227693
Time
Date	199211
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : abi
State Reference	TX
Altitude	msl bound lower : 10000 msl bound upper : 10700
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turboprop Eng
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	enroute airway : abi
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	cruise other
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 210 flight time total : 14300 flight time type : 1100
ASRS Report	227693
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 other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 1500 vertical : 300
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

From the TCASII, we received a TA showing 12:30 position, 3 mi, 400 ft below us. As we looked for the traffic, approach issued a TA at 12:30, 2 1/2 mi, 9500 ft MSL, eastbound, an small aircraft. When the TCASII target entered inside the 2 mi range mark, we received a TCASII RA commanding a climb 1000 FPM. The first officer disconnected the autoplt and began climbing and at 10700 ft MSL the TCASII advised clear of traffic. The first officer observed the small aircraft at 2 O'clock the first time we were able to find him. The TCASII showed the small aircraft at 300 ft below us. We advised ATC of the altitude deviation and TCASII RA and returned to our assigned altitude, 10000 ft MSL. We advised ATC of the alert 3 times and I still believe they don't understand what happened. They never did question our 700 ft deviation.

Original NASA ASRS Text

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

Narrative: FROM THE TCASII, WE RECEIVED A TA SHOWING 12:30 POS, 3 MI, 400 FT BELOW US. AS WE LOOKED FOR THE TFC, APCH ISSUED A TA AT 12:30, 2 1/2 MI, 9500 FT MSL, EBOUND, AN SMA. WHEN THE TCASII TARGET ENTERED INSIDE THE 2 MI RANGE MARK, WE RECEIVED A TCASII RA COMMANDING A CLB 1000 FPM. THE FO DISCONNECTED THE AUTOPLT AND BEGAN CLBING AND AT 10700 FT MSL THE TCASII ADVISED CLR OF TFC. THE FO OBSERVED THE SMA AT 2 O'CLOCK THE FIRST TIME WE WERE ABLE TO FIND HIM. THE TCASII SHOWED THE SMA AT 300 FT BELOW US. WE ADVISED ATC OF THE ALTDEV AND TCASII RA AND RETURNED TO OUR ASSIGNED ALT, 10000 FT MSL. WE ADVISED ATC OF THE ALERT 3 TIMES AND I STILL BELIEVE THEY DON'T UNDERSTAND WHAT HAPPENED. THEY NEVER DID QUESTION OUR 700 FT DEV.

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.