ZDV controller experienced near midair collision with 2 aircraft at FL370.

Attributes
ACN	590412
Time
Date	200308
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zdv.artcc navaid : dbl.vor
State Reference	CO
Altitude	msl single value : 37000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdv.artcc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zdv.artcc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : radar
Qualification	controller : radar
Experience	controller radar : 21 controller time certified in position1 : 18
ASRS Report	590412
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne critical non adherence : clearance non adherence : required legal separation other spatial deviation
Independent Detector	atc equipment : conflict alert aircraft equipment : tcas
Resolutory Action	controller : issued new clearance flight crew : took evasive action
Consequence	faa : investigated
Supplementary
Problem Areas	ATC Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

I was radar controller at ZDV. I noticed conflict between aircraft X and aircraft Y at FL370. I instructed aircraft X to turn runway 40R. Aircraft X read back runway 40R but actually turned runway 40L resulting in 2 aircraft with loss of separation.

Original NASA ASRS Text

Title: ZDV CTLR EXPERIENCED NMAC WITH 2 ACFT AT FL370.

Narrative: I WAS RADAR CTLR AT ZDV. I NOTICED CONFLICT BTWN ACFT X AND ACFT Y AT FL370. I INSTRUCTED ACFT X TO TURN RWY 40R. ACFT X READ BACK RWY 40R BUT ACTUALLY TURNED RWY 40L RESULTING IN 2 ACFT WITH LOSS OF SEPARATION.

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.