Air carrier mg altitude deviation excursion from clearance altitude in response to TCASII RA.

Attributes
ACN	179122
Time
Date	199105
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : txo
State Reference	NM
Altitude	msl bound lower : 29000 msl bound upper : 29800
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zab
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
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial
Experience	flight time last 90 days : 210 flight time total : 8000 flight time type : 1600
ASRS Report	179122
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	vertical : 2800
Supplementary
Air Traffic Incident	other

Narrative:

We were level at FL290 over texico VOR. Received a TA on TCAS with a conflicting aircraft at 900' below and climbing. Received an RA to climb. TCAS commanded a 2000 FPM climb. Since traffic was not seen visually, followed TCAS instructions and initiated climb. At FL298, TCAS reported us clear of traffic. Simultaneously we visually acquired traffic below us and returned to FL290. ATC advised us that no conflict existed. Opp direction traffic appeared level below us.

Original NASA ASRS Text

Title: ACR MG ALT DEVIATION EXCURSION FROM CLRNC ALT IN RESPONSE TO TCASII RA.

Narrative: WE WERE LEVEL AT FL290 OVER TEXICO VOR. RECEIVED A TA ON TCAS WITH A CONFLICTING ACFT AT 900' BELOW AND CLBING. RECEIVED AN RA TO CLB. TCAS COMMANDED A 2000 FPM CLB. SINCE TFC WAS NOT SEEN VISUALLY, FOLLOWED TCAS INSTRUCTIONS AND INITIATED CLB. AT FL298, TCAS RPTED US CLR OF TFC. SIMULTANEOUSLY WE VISUALLY ACQUIRED TFC BELOW US AND RETURNED TO FL290. ATC ADVISED US THAT NO CONFLICT EXISTED. OPP DIRECTION TFC APPEARED LEVEL BELOW US.

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.