Near midair collision between corp jet and air carrier while on final approach to den. Pilot deviation resulted in close proximity. Air carrier made visual approach to wrong parallel runway. Approach controller failed to ensure separation.

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Attributes
ACN	99224
Time
Date	198811
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : den
State Reference	CO
Altitude	msl bound lower : 7000 msl bound upper : 7100
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : den tower : den
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach landing other
Route In Use	approach : visual
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach landing other
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : local
ASRS Report	99224
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	conflict : nmac non adherence : required legal separation non adherence : clearance other spatial deviation
Resolutory Action	controller : issued new clearance none taken : unable none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 400 vertical : 100
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	Pilot Deviation Operational Error

Narrative:

Corp X was cleared for a visual approach runway 26L, by approach. Air carrier Y was cleared for a visual approach runway 26R, by approach. X was cleared to land 26L by the tower. Y checked in with the tower 16 seconds later for 26L. I cleared Y to land on 26R. Air carrier Y replied to the landing clearance that he was for 26L. Corp X said that air carrier Y almost ran over him headed for the left. I reclred Y for 26R and stated the landing runway twice. Y moved over to 26R after asking if he was far enough in front to move over, and X said that he was.

Original NASA ASRS Text

Title: NMAC BETWEEN CORP JET AND ACR WHILE ON FINAL APCH TO DEN. PLT DEVIATION RESULTED IN CLOSE PROX. ACR MADE VISUAL APCH TO WRONG PARALLEL RWY. APCH CTLR FAILED TO ENSURE SEPARATION.

Narrative: CORP X WAS CLRED FOR A VISUAL APCH RWY 26L, BY APCH. ACR Y WAS CLRED FOR A VISUAL APCH RWY 26R, BY APCH. X WAS CLRED TO LAND 26L BY THE TWR. Y CHKED IN WITH THE TWR 16 SECONDS LATER FOR 26L. I CLRED Y TO LAND ON 26R. ACR Y REPLIED TO THE LNDG CLRNC THAT HE WAS FOR 26L. CORP X SAID THAT ACR Y ALMOST RAN OVER HIM HEADED FOR THE L. I RECLRED Y FOR 26R AND STATED THE LNDG RWY TWICE. Y MOVED OVER TO 26R AFTER ASKING IF HE WAS FAR ENOUGH IN FRONT TO MOVE OVER, AND X SAID THAT HE WAS.

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.