Flight crew of a widebody transport slowed at 10000 ft for the appropriate speed reduction causing ATC advisory traffic to become less than standard separation and a TCASII alert. However, traffic had been sighted prior to the TCASII alert so that see and avoid could be used if needed.

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Attributes
ACN	359670
Time
Date	199702
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cvg
State Reference	OH
Altitude	msl bound lower : 10000 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	enroute airway : cvg
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	other other : other pilot : commercial pilot : instrument pilot : atp
Experience	flight time last 90 days : 100 flight time total : 14000 flight time type : 50
ASRS Report	359670
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Miss Distance	horizontal : 350 vertical : 1500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

We were wbound into cvg with clearance to leave our altitude of 17000 ft down to 7000 ft. Approaching 10000 ft center informed us of company traffic northbound (left to right) level at 10000 ft. We were at 10000 ft slowing to 250 KTS and reported a visual on the northbound traffic. Center again informed us of the traffic and to descend to 7000 ft! We again confirmed a visual on the traffic and that we were continuing our descent. We did get a TCASII RA and the verbal 'descend now.' we crossed behind and below the level traffic at around 8500 ft and 2-3 mi to the south. I feel center should have been able to read our airspeed in the descent and realize we would need to level off at 10000 ft in order to reduce our airspeed to 250 KTS. Perhaps a radar vector to the south or away from the traffic would have resolved any perceived conflict.

Original NASA ASRS Text

Title: FLC OF A WDB SLOWED AT 10000 FT FOR THE APPROPRIATE SPD REDUCTION CAUSING ATC ADVISORY TFC TO BECOME LTSS AND A TCASII ALERT. HOWEVER, TFC HAD BEEN SIGHTED PRIOR TO THE TCASII ALERT SO THAT SEE AND AVOID COULD BE USED IF NEEDED.

Narrative: WE WERE WBOUND INTO CVG WITH CLRNC TO LEAVE OUR ALT OF 17000 FT DOWN TO 7000 FT. APCHING 10000 FT CTR INFORMED US OF COMPANY TFC NBOUND (L TO R) LEVEL AT 10000 FT. WE WERE AT 10000 FT SLOWING TO 250 KTS AND RPTED A VISUAL ON THE NBOUND TFC. CTR AGAIN INFORMED US OF THE TFC AND TO DSND TO 7000 FT! WE AGAIN CONFIRMED A VISUAL ON THE TFC AND THAT WE WERE CONTINUING OUR DSCNT. WE DID GET A TCASII RA AND THE VERBAL 'DSND NOW.' WE CROSSED BEHIND AND BELOW THE LEVEL TFC AT AROUND 8500 FT AND 2-3 MI TO THE S. I FEEL CTR SHOULD HAVE BEEN ABLE TO READ OUR AIRSPD IN THE DSCNT AND REALIZE WE WOULD NEED TO LEVEL OFF AT 10000 FT IN ORDER TO REDUCE OUR AIRSPD TO 250 KTS. PERHAPS A RADAR VECTOR TO THE S OR AWAY FROM THE TFC WOULD HAVE RESOLVED ANY PERCEIVED CONFLICT.

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.