Air carrier light transport climbed above assigned altitude and conflicted with another aircraft.

Attributes
ACN	142166
Time
Date	199004
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : den
State Reference	CO
Altitude	msl bound lower : 10000 msl bound upper : 10500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : den
Operator	common carrier : air carrier
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : initial
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 300 flight time total : 8000 flight time type : 725
ASRS Report	142166
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	142187
Events
Anomaly	altitude deviation : overshoot non adherence : required legal separation non adherence : clearance
Independent Detector	other controllera other flight crewa
Resolutory Action	other
Consequence	Other
Miss Distance	horizontal : 10000 vertical : 500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On climb out, I was flying and at 10300' noticed I had climbed through my altitude. I pushed the nose over to recover back to my altitude. The aircraft continued to climb to 10500' till it started to level at 10000'. While I initiated the return to my altitude, departure called traffic at 12 O'clock and 11000'. We had the traffic in sight. Supplemental information from acn 142187. At 9700', I observed the copilot trimming for level off at 10000'. I reached for the after takeoff checklist and proceeded to complete it. At which time I heard the altitude alerter and observed the altitude deviation of 500'. Denver center said 'air carrier X maintain 10000''. No evasive maneuver was necessary. 12 O'clock traffic was observed was an air carrier large transport. To avoid this happening in the future, we should maintain assigned altitudes. Also, center should have mentioned our traffic again and reminded us of our altitude.

Original NASA ASRS Text

Title: ACR LTT CLIMBED ABOVE ASSIGNED ALT AND CONFLICTED WITH ANOTHER ACFT.

Narrative: ON CLBOUT, I WAS FLYING AND AT 10300' NOTICED I HAD CLBED THROUGH MY ALT. I PUSHED THE NOSE OVER TO RECOVER BACK TO MY ALT. THE ACFT CONTINUED TO CLB TO 10500' TILL IT STARTED TO LEVEL AT 10000'. WHILE I INITIATED THE RETURN TO MY ALT, DEP CALLED TFC AT 12 O'CLOCK AND 11000'. WE HAD THE TFC IN SIGHT. SUPPLEMENTAL INFO FROM ACN 142187. AT 9700', I OBSERVED THE COPLT TRIMMING FOR LEVEL OFF AT 10000'. I REACHED FOR THE AFTER TKOF CHKLIST AND PROCEEDED TO COMPLETE IT. AT WHICH TIME I HEARD THE ALT ALERTER AND OBSERVED THE ALT DEVIATION OF 500'. DENVER CTR SAID 'ACR X MAINTAIN 10000''. NO EVASIVE MANEUVER WAS NECESSARY. 12 O'CLOCK TFC WAS OBSERVED WAS AN ACR LGT. TO AVOID THIS HAPPENING IN THE FUTURE, WE SHOULD MAINTAIN ASSIGNED ALTS. ALSO, CTR SHOULD HAVE MENTIONED OUR TFC AGAIN AND REMINDED US OF OUR ALT.

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.