An medium large transport climbed in response to a TCASII command.

Attributes
ACN	222449
Time
Date	199209
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ewc
State Reference	PA
Altitude	msl bound lower : 26000 msl bound upper : 26700
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other
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 : instrument pilot : flight engineer pilot : commercial pilot : atp
Experience	flight time last 90 days : 200 flight time total : 10000 flight time type : 2000
ASRS Report	222449
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
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 flight crewa
Resolutory Action	flight crew : returned to intended course or assigned course flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 6000 vertical : 1000
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Received traffic report by ATC. Saw traffic pass south of our position. TCASII gave TA followed by RA. Followed RA as per company directives. Climbed from 26000 to 26700 prior to receiving clear of conflict. I believe this TCASII RA was unnecessary, but we followed proper procedure, then notified ATC and then the company. TCASII software needs much improvement if we are to trust it.

Original NASA ASRS Text

Title: AN MLG CLBED IN RESPONSE TO A TCASII COMMAND.

Narrative: RECEIVED TFC RPT BY ATC. SAW TFC PASS S OF OUR POS. TCASII GAVE TA FOLLOWED BY RA. FOLLOWED RA AS PER COMPANY DIRECTIVES. CLBED FROM 26000 TO 26700 PRIOR TO RECEIVING CLR OF CONFLICT. I BELIEVE THIS TCASII RA WAS UNNECESSARY, BUT WE FOLLOWED PROPER PROC, THEN NOTIFIED ATC AND THEN THE COMPANY. TCASII SOFTWARE NEEDS MUCH IMPROVEMENT IF WE ARE TO TRUST IT.

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.