Less than standard separation.

Attributes
ACN	295301
Time
Date	199502
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : den
State Reference	CO
Altitude	msl bound lower : 9600 msl bound upper : 9600
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : den tower : swf
Operator	common carrier : air carrier
Make Model Name	Beech 1900
Operating Under FAR Part	Part 135
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other descent : approach
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Experience	controller military : 4 controller radar : 18 controller supervisory : 1
ASRS Report	295301
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : required legal separation non adherence : published procedure other anomaly other other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa
Resolutory Action	flight crew : took evasive action none taken : insufficient time
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

BE02 on approach to runway 18 denver was almost hit by a B757 following TCASII resolution. Callback conversation with reporter revealed the following information: the reporter is a controller in the den approach TRACON. In this incident, the B-757 responded to a TCASII RA and climbed into the BE02. The reporter does not know what caused the alert action for the B-757. The reporter does not know exactly how close the 2 aircraft came, but it was 'less than 2 mi, his personal minimum.' the reporter is not one of the biggest fans of TCASII. This incident happened so fast that the reporter had no time to warn either aircraft. No further evasive action was taken, no advisories given.

Original NASA ASRS Text

Title: LTSS.

Narrative: BE02 ON APCH TO RWY 18 DENVER WAS ALMOST HIT BY A B757 FOLLOWING TCASII RESOLUTION. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR IS A CTLR IN THE DEN APCH TRACON. IN THIS INCIDENT, THE B-757 RESPONDED TO A TCASII RA AND CLBED INTO THE BE02. THE RPTR DOES NOT KNOW WHAT CAUSED THE ALERT ACTION FOR THE B-757. THE RPTR DOES NOT KNOW EXACTLY HOW CLOSE THE 2 ACFT CAME, BUT IT WAS 'LESS THAN 2 MI, HIS PERSONAL MINIMUM.' THE RPTR IS NOT ONE OF THE BIGGEST FANS OF TCASII. THIS INCIDENT HAPPENED SO FAST THAT THE RPTR HAD NO TIME TO WARN EITHER ACFT. NO FURTHER EVASIVE ACTION WAS TAKEN, NO ADVISORIES GIVEN.

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.