Air carrier B737 on approach to bur receives TCASII warning on traffic that may have been VFR in IFR...

Attributes
ACN	549809
Time
Date	200206
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : bur.airport
State Reference	CA
Altitude	msl single value : 2600
Environment
Flight Conditions	Marginal
Light	Daylight
Aircraft 1
Controlling Facilities	tower : bur.tower
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar
Experience	controller time certified in position1 : 4 flight time total : 100
ASRS Report	549809
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	conflict : airborne critical inflight encounter : vfr in imc inflight encounter : weather non adherence : far non adherence : required legal separation
Independent Detector	atc equipment other atc equipment : radar mode c aircraft equipment : tcas other controllera other flight crewa
Resolutory Action	controller : issued advisory
Miss Distance	horizontal : 0 vertical : 600
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Aircraft #2 was observed at 1900 ft MSL on radar northbound. Aircraft #1 had a TCASII RA and had to level off. Aircraft #1 was very concerned. This problem occurs on an almost daily basis here at bur. In the pattern, aircraft #2, may not have been clear of the cloud clearance limits set by the far/aim.

Original NASA ASRS Text

Title: ACR B737 ON APCH TO BUR RECEIVES TCASII WARNING ON TFC THAT MAY HAVE BEEN VFR IN IFR CONDITIONS.

Narrative: ACFT #2 WAS OBSERVED AT 1900 FT MSL ON RADAR NBOUND. ACFT #1 HAD A TCASII RA AND HAD TO LEVEL OFF. ACFT #1 WAS VERY CONCERNED. THIS PROB OCCURS ON AN ALMOST DAILY BASIS HERE AT BUR. IN THE PATTERN, ACFT #2, MAY NOT HAVE BEEN CLR OF THE CLOUD CLRNC LIMITS SET BY THE FAR/AIM.

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.

Air carrier B737 on approach to bur receives TCASII warning on traffic that may have been VFR in IFR conditions.