Air carrier X descent through occupied altitude had less than standard separation from cpr Y. System...

Attributes
ACN	268101
Time
Date	199404
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : iiu
State Reference	KY
Altitude	msl bound lower : 33000 msl bound upper : 34400
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Flight Phase	descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller military : 8 controller radar : 6
ASRS Report	268101
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation non adherence : published procedure
Independent Detector	atc equipment other atc equipment : unspecified
Resolutory Action	controller : issued new clearance other
Consequence	faa : investigated
Miss Distance	horizontal : 24000 vertical : 1600
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X northbound at FL350 inbound to ind. The sector I was working has a restriction to give ind arrs to the next sector at or below FL310. Y was 15 mi southeast of X at FL31O with a 40 KT overtake. I descended X to FL280 in order to get him under Y and meet the sector restriction. Cpr Z was sebound at FL330. When X was at FL344 conflict alert activated. I climbed X back to FL350, then I turned Z left to a 090 degree heading. Then I turned X 30 degrees left.

Original NASA ASRS Text

Title: ACR X DSCNT THROUGH OCCUPIED ALT HAD LTSS FROM CPR Y. SYS ERROR.

Narrative: ACR X NBOUND AT FL350 INBOUND TO IND. THE SECTOR I WAS WORKING HAS A RESTRICTION TO GIVE IND ARRS TO THE NEXT SECTOR AT OR BELOW FL310. Y WAS 15 MI SE OF X AT FL31O WITH A 40 KT OVERTAKE. I DSNDED X TO FL280 IN ORDER TO GET HIM UNDER Y AND MEET THE SECTOR RESTRICTION. CPR Z WAS SEBOUND AT FL330. WHEN X WAS AT FL344 CONFLICT ALERT ACTIVATED. I CLBED X BACK TO FL350, THEN I TURNED Z L TO A 090 DEG HDG. THEN I TURNED X 30 DEGS L.

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.

Air carrier X descent through occupied altitude had less than standard separation from cpr Y. System error.