Air carrier large transport reversed descent in response to TCASII RA.

Attributes
ACN	192214
Time
Date	199110
Day	Tue
Place
Locale Reference	airport : den
State Reference	CO
Altitude	msl bound lower : 16500 msl bound upper : 17000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sea
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other descent other
Route In Use	arrival star : star enroute airway : den
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 11000
ASRS Report	192214
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : returned to intended course or assigned course
Consequence	Other
Miss Distance	vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

We were cleared by den approach control to cross kiowa VOR at 17000, then descend to 11000. As soon as we passed kiowa VOR we initiated our descent. Immediately the TCASII warned of traffic, followed instantly by the TCASII command 'climb, climb, monitor vertical speed.' I saw on the TCASII that the conflicting traffic was at 16500 and immediately visually searched for the traffic. The first officer, who was flying, followed the TCASII and climbed to 17500. At 17500 the TCASII said 'clear of traffic.' the first officer, who was monitoring TCASII while the flight engineer and I looked for the traffic, said that he saw on the TCASII that the altitude difference was -00-. The den approach controller told us that he had a 16500 readout on our traffic as we left 17000 for 11000 (after the fact). None of us ever visually saw the other aircraft. TCASII works.

Original NASA ASRS Text

Title: ACR LGT REVERSED DSCNT IN RESPONSE TO TCASII RA.

Narrative: WE WERE CLRED BY DEN APCH CTL TO CROSS KIOWA VOR AT 17000, THEN DSND TO 11000. AS SOON AS WE PASSED KIOWA VOR WE INITIATED OUR DSCNT. IMMEDIATELY THE TCASII WARNED OF TFC, FOLLOWED INSTANTLY BY THE TCASII COMMAND 'CLB, CLB, MONITOR VERT SPD.' I SAW ON THE TCASII THAT THE CONFLICTING TFC WAS AT 16500 AND IMMEDIATELY VISUALLY SEARCHED FOR THE TFC. THE FO, WHO WAS FLYING, FOLLOWED THE TCASII AND CLBED TO 17500. AT 17500 THE TCASII SAID 'CLR OF TFC.' THE FO, WHO WAS MONITORING TCASII WHILE THE FLT ENGINEER AND I LOOKED FOR THE TFC, SAID THAT HE SAW ON THE TCASII THAT THE ALT DIFFERENCE WAS -00-. THE DEN APCH CTLR TOLD US THAT HE HAD A 16500 READOUT ON OUR TFC AS WE LEFT 17000 FOR 11000 (AFTER THE FACT). NONE OF US EVER VISUALLY SAW THE OTHER ACFT. TCASII WORKS.

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.