TCASII RA. Flight crew climbs 450 ft until alert ended.

Attributes
ACN	233062
Time
Date	199302
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : ioc
State Reference	CO
Altitude	msl bound lower : 28000 msl bound upper : 28450
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdv
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 170 flight time total : 10000 flight time type : 5000
ASRS Report	233062
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	horizontal : 3000 vertical : 1000
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Flying west, inbound to den at FL200, observed a TA (yellow) alert on TCASII of an aircraft nebound, but did not have a visual sighting of the aircraft. About 1 min later, received an RA (red) pull up alert (maximum pull up indication). After what seemed about 3 seconds, disconnected the autoplt and began climb and advised the center. The alert ended at about FL283, our climb stopped at 28450 ft and I saw the other aircraft at our 12 O'clock position. TCASII indicated that the other aircraft was at FL272. Descended back to FL280.

Original NASA ASRS Text

Title: TCASII RA. FLC CLBS 450 FT UNTIL ALERT ENDED.

Narrative: FLYING W, INBOUND TO DEN AT FL200, OBSERVED A TA (YELLOW) ALERT ON TCASII OF AN ACFT NEBOUND, BUT DID NOT HAVE A VISUAL SIGHTING OF THE ACFT. ABOUT 1 MIN LATER, RECEIVED AN RA (RED) PULL UP ALERT (MAX PULL UP INDICATION). AFTER WHAT SEEMED ABOUT 3 SECONDS, DISCONNECTED THE AUTOPLT AND BEGAN CLB AND ADVISED THE CTR. THE ALERT ENDED AT ABOUT FL283, OUR CLB STOPPED AT 28450 FT AND I SAW THE OTHER ACFT AT OUR 12 O'CLOCK POS. TCASII INDICATED THAT THE OTHER ACFT WAS AT FL272. DSNDED BACK TO FL280.

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.