Flight crew of a widebody transport descended from assigned altitude in response to a TCASII RA.

Attributes
ACN	316741
Time
Date	199509
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ara
State Reference	FO
Altitude	msl bound lower : 26500 msl bound upper : 28000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	enroute airway : lggg
Flight Plan	IFR
Aircraft 2
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	other : unknown
Flight Phase	descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	other other : other pilot : atp
Experience	flight time last 90 days : 120 flight time total : 17000 flight time type : 160
ASRS Report	316741
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : atp pilot : commercial
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	vertical : 1300
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Leveled at FL280 just prior to ara VOR. While wbound on UG8, other aircraft eastbound on UG8 cleared by athens control to descend to unknown altitude. TCASII white, yellow, then red TA's and RA's. RA required 2500-3000 FPM descent to place vsi needle in green arc. I took control of aircraft to perform maneuver. Descended to FL265 before returning to FL280. No injuries. Other aircraft also reported TCASII alert and stopped his descent at FL293. Incident occurred in non radar ATC environment.

Original NASA ASRS Text

Title: FLC OF A WDB DSNDED FROM ASSIGNED ALT IN RESPONSE TO A TCASII RA.

Narrative: LEVELED AT FL280 JUST PRIOR TO ARA VOR. WHILE WBOUND ON UG8, OTHER ACFT EBOUND ON UG8 CLRED BY ATHENS CTL TO DSND TO UNKNOWN ALT. TCASII WHITE, YELLOW, THEN RED TA'S AND RA'S. RA REQUIRED 2500-3000 FPM DSCNT TO PLACE VSI NEEDLE IN GREEN ARC. I TOOK CTL OF ACFT TO PERFORM MANEUVER. DSNDED TO FL265 BEFORE RETURNING TO FL280. NO INJURIES. OTHER ACFT ALSO RPTED TCASII ALERT AND STOPPED HIS DSCNT AT FL293. INCIDENT OCCURRED IN NON RADAR ATC ENVIRONMENT.

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.