An aircraft climbed through an altitude of another aircraft with less than standard separation.

Attributes
ACN	155801
Time
Date	199008
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : dkk
State Reference	TN
Altitude	msl bound lower : 35000 msl bound upper : 35000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob
Operator	common carrier : air taxi
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Route In Use	enroute airway : zob
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller non radar : 2 controller radar : 1
ASRS Report	155801
Person 2
Affiliation	company : air taxi
Function	oversight : pic
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Consequence	faa : investigated
Miss Distance	horizontal : 13200 vertical : 800
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Very light traffic load. Southbound light transport climbing to FL410. Westbound ord FL350. Issued at time restriction for light transport to depart FL370 in 3 mins or less, report leaving. After determining that his was insufficient, issued 2 200 degree right turn, but still insufficient to prevent error. Traffic at FL350 not in my airspace as I voluntarily was providing the sep. My initial judgement, based on use of time/vector lines provided for us, was that the time restriction should have been sufficient for sep, so it basically was my error in judgement. Also, there are a lot of tendencies to work extra hear to provide service to higher performance aircraft (i.e., the light transport in this case) to get them up to their cruising altitudes. If traffic had been moderate or greater, I probably would have left the light transport at FL330 until clearing underneath the traffic.

Original NASA ASRS Text

Title: AN ACFT CLIMBED THROUGH AN ALT OF ANOTHER ACFT WITH LESS THAN STANDARD SEPARATION.

Narrative: VERY LIGHT TFC LOAD. SBND LTT CLBING TO FL410. WBND ORD FL350. ISSUED AT TIME RESTRICTION FOR LTT TO DEPART FL370 IN 3 MINS OR LESS, RPT LEAVING. AFTER DETERMINING THAT HIS WAS INSUFFICIENT, ISSUED 2 200 DEG RIGHT TURN, BUT STILL INSUFFICIENT TO PREVENT ERROR. TFC AT FL350 NOT IN MY AIRSPACE AS I VOLUNTARILY WAS PROVIDING THE SEP. MY INITIAL JUDGEMENT, BASED ON USE OF TIME/VECTOR LINES PROVIDED FOR US, WAS THAT THE TIME RESTRICTION SHOULD HAVE BEEN SUFFICIENT FOR SEP, SO IT BASICALLY WAS MY ERROR IN JUDGEMENT. ALSO, THERE ARE A LOT OF TENDENCIES TO WORK EXTRA HEAR TO PROVIDE SVC TO HIGHER PERFORMANCE ACFT (I.E., THE LTT IN THIS CASE) TO GET THEM UP TO THEIR CRUISING ALTS. IF TFC HAD BEEN MODERATE OR GREATER, I PROBABLY WOULD HAVE LEFT THE LTT AT FL330 UNTIL CLRING UNDERNEATH THE TFC.

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.