Operational error. Less than standard separation between air carrier medium large transport and unknown aircraft. During climb out of den just after handoff to center.

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Attributes
ACN	102725
Time
Date	198901
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : den
State Reference	CO
Altitude	msl bound lower : 10000 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zdv tower : atl
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	departure other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : flight engineer pilot : commercial pilot : cfi
Experience	flight time last 90 days : 210 flight time total : 5000 flight time type : 210
ASRS Report	102725
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe non adherence : required legal separation
Independent Detector	other controllera
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 4500 vertical : 200
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

We were given a clearance to climb from 10000 MSL to 20000 MSL. As I approached 10800 MSL the controller said something I couldn't make out but the captain did understand. He (the captain) said to return to 10000 MSL, at that moment I looked to my right and saw the other aircraft. I started a descent to the left and then the captain took control. The controller admitted his mistake to us over the radio. No one was hurt on our aircraft.

Original NASA ASRS Text

Title: OPERROR. LESS THAN STANDARD SEPARATION BETWEEN ACR MLG AND UNKNOWN ACFT. DURING CLIMB OUT OF DEN JUST AFTER HANDOFF TO CENTER.

Narrative: WE WERE GIVEN A CLRNC TO CLIMB FROM 10000 MSL TO 20000 MSL. AS I APCHED 10800 MSL THE CTLR SAID SOMETHING I COULDN'T MAKE OUT BUT THE CAPT DID UNDERSTAND. HE (THE CAPT) SAID TO RETURN TO 10000 MSL, AT THAT MOMENT I LOOKED TO MY RIGHT AND SAW THE OTHER ACFT. I STARTED A DSCNT TO THE LEFT AND THEN THE CAPT TOOK CONTROL. THE CTLR ADMITTED HIS MISTAKE TO US OVER THE RADIO. NO ONE WAS HURT ON OUR ACFT.

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.