Air carrier climbed through altitude occupied by another aircraft.

Attributes
ACN	111238
Time
Date	198905
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : mht
State Reference	NH
Altitude	msl bound lower : 28000 msl bound upper : 28400
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zbw
Operator	other
Make Model Name	Military Transport
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 4 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
ASRS Report	111238
Person 2
Affiliation	government : military
Function	flight crew : captain oversight : pic
Qualification	pilot : military
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	Other
Miss Distance	horizontal : 24000 vertical : 400
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

At approximately XX00Z, I was working sector 39. I had 5 or 6 aircraft on frequency. Mlt X was climbing swbnd from pease AFB climbing to FL280. Air carrier Y was climbing northeast bound to FL290. Due to laser north atacc being active 100B FL500, I turned air carrier Y heading 080 degrees to go east of it. This put the 2 aircraft closer to each other than if air carrier Y had remained on course. When the aircraft were approximately 15 mi apart, I turned mlt X (at FL280) left heading 200 degrees and air carrier Y (at FL284) left heading 040 degrees. Air carrier Y requested heading again. I reissued it and descended mlt X to FL270. The action was too little too late. I should have anticipated air carrier Y slow climb rate and stopped the mlt X further below say FL240 and laddered him up.

Original NASA ASRS Text

Title: ACR CLIMBED THROUGH ALT OCCUPIED BY ANOTHER ACFT.

Narrative: AT APPROX XX00Z, I WAS WORKING SECTOR 39. I HAD 5 OR 6 ACFT ON FREQ. MLT X WAS CLBING SWBND FROM PEASE AFB CLBING TO FL280. ACR Y WAS CLBING NE BOUND TO FL290. DUE TO LASER N ATACC BEING ACTIVE 100B FL500, I TURNED ACR Y HDG 080 DEGS TO GO E OF IT. THIS PUT THE 2 ACFT CLOSER TO EACH OTHER THAN IF ACR Y HAD REMAINED ON COURSE. WHEN THE ACFT WERE APPROX 15 MI APART, I TURNED MLT X (AT FL280) LEFT HDG 200 DEGS AND ACR Y (AT FL284) LEFT HDG 040 DEGS. ACR Y REQUESTED HDG AGAIN. I REISSUED IT AND DSNDED MLT X TO FL270. THE ACTION WAS TOO LITTLE TOO LATE. I SHOULD HAVE ANTICIPATED ACR Y SLOW CLB RATE AND STOPPED THE MLT X FURTHER BELOW SAY FL240 AND LADDERED HIM UP.

Data retrieved from NASA's ASRS site as of August 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.