Air carrier was issued a climb through altitude of another aircraft resulting in less than standard ...

Attributes
ACN	110808
Time
Date	198905
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : stl
State Reference	MO
Altitude	msl bound lower : 6000 msl bound upper : 8600
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : stl
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	climbout : intermediate altitude
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 : departure
Qualification	controller : radar
ASRS Report	110808
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	faa : investigated
Miss Distance	horizontal : 12000 vertical : 500
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X was climbing out on departure and advised he had just climbed through the altitude of air carrier Y. I was working both aircraft. The air carrier Y was established on an arwy southbound at 6000'. Air carrier X was eastbound approximately 3 mi west of the air carrier Y climbing out of 7800'. I assumed the air carrier X would not be a factor due to rate of climb and climbed the aircraft to 15000'. A short time later air carrier X advised he had climbed through the altitude of air carrier Y. The aircraft asked me to mark the tapes and I replied affirmative. If I had waited 1 or 2 mi before climbing it would have been no factor. I intend in the future not to rely on my judgement of climb rates but to just wait until I see the targets pass.

Original NASA ASRS Text

Title: ACR WAS ISSUED A CLIMB THROUGH ALT OF ANOTHER ACFT RESULTING IN LESS THAN STANDARD SEPARATION.

Narrative: ACR X WAS CLBING OUT ON DEP AND ADVISED HE HAD JUST CLBED THROUGH THE ALT OF ACR Y. I WAS WORKING BOTH ACFT. THE ACR Y WAS ESTABLISHED ON AN ARWY SBND AT 6000'. ACR X WAS EBND APPROX 3 MI W OF THE ACR Y CLBING OUT OF 7800'. I ASSUMED THE ACR X WOULD NOT BE A FACTOR DUE TO RATE OF CLB AND CLBED THE ACFT TO 15000'. A SHORT TIME LATER ACR X ADVISED HE HAD CLBED THROUGH THE ALT OF ACR Y. THE ACFT ASKED ME TO MARK THE TAPES AND I REPLIED AFFIRMATIVE. IF I HAD WAITED 1 OR 2 MI BEFORE CLBING IT WOULD HAVE BEEN NO FACTOR. I INTEND IN THE FUTURE NOT TO RELY ON MY JUDGEMENT OF CLB RATES BUT TO JUST WAIT UNTIL I SEE THE TARGETS PASS.

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.

Air carrier was issued a climb through altitude of another aircraft resulting in less than standard separation.