Air carrier X had less than standard separation from aircraft Y. System error.

Attributes
ACN	155831
Time
Date	199008
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : ind
State Reference	IN
Altitude	msl bound lower : 6000 msl bound upper : 9000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ind
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 255 flight time total : 7920 flight time type : 3060
ASRS Report	155831
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 145 flight time total : 9254 flight time type : 2308
ASRS Report	155364
Events
Anomaly	altitude deviation : overshoot conflict : airborne less severe non adherence : clearance non adherence : published procedure non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	none taken : detected after the fact
Consequence	Other
Miss Distance	horizontal : 12000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Departure control issued a left climbing turn to 10000'. I acknowledged by saying back air carrier X cleared to 10000'. Shortly afterwards, the controller issued a traffic advisory for aircraft Y descending. We said tally ho in response to seeing aircraft Y. I watched aircraft Y descend below us. The controller then excitedly asked us if we had not heard our clearance to stop our climb at 6000'. I responded that we were not given any restriction to the clearance limit of 10000', which we had received and acknowledged.

Original NASA ASRS Text

Title: ACR X HAD LESS THAN STANDARD SEPARATION FROM ACFT Y. SYSTEM ERROR.

Narrative: DEP CTL ISSUED A L CLBING TURN TO 10000'. I ACKNOWLEDGED BY SAYING BACK ACR X CLRED TO 10000'. SHORTLY AFTERWARDS, THE CTLR ISSUED A TFC ADVISORY FOR ACFT Y DSNDING. WE SAID TALLY HO IN RESPONSE TO SEEING ACFT Y. I WATCHED ACFT Y DSND BELOW US. THE CTLR THEN EXCITEDLY ASKED US IF WE HAD NOT HEARD OUR CLRNC TO STOP OUR CLB AT 6000'. I RESPONDED THAT WE WERE NOT GIVEN ANY RESTRICTION TO THE CLRNC LIMIT OF 10000', WHICH WE HAD RECEIVED AND ACKNOWLEDGED.

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.