An FK100 descending to 17000 ft passes about 600 ft over a GA aircraft cruising opposite direction a...

Attributes
ACN	429970
Time
Date	199903
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : byp.vortac
State Reference	TX
Altitude	msl bound lower : 17500 msl bound upper : 18300
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zfw.artcc
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Navigation In Use	other other vortac
Route In Use	arrival star : byp.byp5
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zfw.artcc
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Navigation In Use	other vortac
Flight Phase	cruise : level
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	429970
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
ASRS Report	429969
Events
Anomaly	altitude deviation : overshoot conflict : airborne less severe non adherence : clearance non adherence : published procedure other anomaly other
Independent Detector	aircraft equipment : tcas other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : took precautionary avoidance action
Miss Distance	vertical : 600
Supplementary
Problem Areas	ATC Human Performance Flight Crew Human Performance
Primary Problem	ATC Human Performance

Narrative:

On byp 3 arrival near covie, had clearance to 17000 ft. After passing approximately FL183, received TCASII RA. Disengaged autoplt and followed the reduce vertical speed command. The aircraft passed approximately 500 ft below. ATC was busy at the time. Before I could advise him of the RA, he gave us clearance to 11000 ft. I told him about the RA and his response was., he kept us above FL180 till we passed the traffic. I advised him of our clearance to 17000 ft. I don't know if he was working the single engine aircraft or just aware he was there. Supplemental information from acn 429969: observed a light aircraft pass approximately 500 ft below (17500 ft). We advised ATC. He responded that he knew about the traffic and that is why he kept us above FL180. Controller was very busy and we did not have time to discuss it further.

Original NASA ASRS Text

Title: AN FK100 DSNDING TO 17000 FT PASSES ABOUT 600 FT OVER A GA ACFT CRUISING OPPOSITE DIRECTION AT 17500 FT.

Narrative: ON BYP 3 ARR NEAR COVIE, HAD CLRNC TO 17000 FT. AFTER PASSING APPROX FL183, RECEIVED TCASII RA. DISENGAGED AUTOPLT AND FOLLOWED THE REDUCE VERT SPD COMMAND. THE ACFT PASSED APPROX 500 FT BELOW. ATC WAS BUSY AT THE TIME. BEFORE I COULD ADVISE HIM OF THE RA, HE GAVE US CLRNC TO 11000 FT. I TOLD HIM ABOUT THE RA AND HIS RESPONSE WAS., HE KEPT US ABOVE FL180 TILL WE PASSED THE TFC. I ADVISED HIM OF OUR CLRNC TO 17000 FT. I DON'T KNOW IF HE WAS WORKING THE SINGLE ENG ACFT OR JUST AWARE HE WAS THERE. SUPPLEMENTAL INFO FROM ACN 429969: OBSERVED A LIGHT ACFT PASS APPROX 500 FT BELOW (17500 FT). WE ADVISED ATC. HE RESPONDED THAT HE KNEW ABOUT THE TFC AND THAT IS WHY HE KEPT US ABOVE FL180. CTLR WAS VERY BUSY AND WE DID NOT HAVE TIME TO DISCUSS IT FURTHER.

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.

An FK100 descending to 17000 ft passes about 600 ft over a GA aircraft cruising opposite direction at 17500 ft.