<< >> NASA ASRS Report 279750, August 1994

TCASII RA.

Attributes
ACN	279750
Time
Date	199408
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : sfo
State Reference	CA
Altitude	msl bound lower : 1600 msl bound upper : 1800
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : oak
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach
Route In Use	arrival other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 40 flight time total : 5000 flight time type : 40
ASRS Report	279750
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : nmac non adherence : clearance non adherence : far other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 0 vertical : 200
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	Operational Error Pilot Deviation other

Narrative:

On quite bridge runway 28R, ILS runway 28R at 1800 ft AGL, on ILS runway 28R course and GS, TCASII idented traffic at 9-10 O'clock, 1000 ft low. This crew scanned area and could not locate. Crew attempted to query ATC about the traffic, but was unable to get a clear understanding. Intruder continued into while range ring on TCASII until an RA to 'climb, crossing traffic, climb' was issued. During go around response to RA, crew observed intruder symbol below our aircraft and separation deteriorated to 200 ft. During go around, captain observed a twin engine turboprop xx flight in a left bank clearing the airspace below our aircraft to the left in the direction of the approach course to runway 28L.

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Original NASA ASRS Text

Title: TCASII RA.

Narrative: ON QUITE BRIDGE RWY 28R, ILS RWY 28R AT 1800 FT AGL, ON ILS RWY 28R COURSE AND GS, TCASII IDENTED TFC AT 9-10 O'CLOCK, 1000 FT LOW. THIS CREW SCANNED AREA AND COULD NOT LOCATE. CREW ATTEMPTED TO QUERY ATC ABOUT THE TFC, BUT WAS UNABLE TO GET A CLR UNDERSTANDING. INTRUDER CONTINUED INTO WHILE RANGE RING ON TCASII UNTIL AN RA TO 'CLB, XING TFC, CLB' WAS ISSUED. DURING GAR RESPONSE TO RA, CREW OBSERVED INTRUDER SYMBOL BELOW OUR ACFT AND SEPARATION DETERIORATED TO 200 FT. DURING GAR, CAPT OBSERVED A TWIN ENG TURBOPROP XX FLT IN A L BANK CLRING THE AIRSPACE BELOW OUR ACFT TO THE L IN THE DIRECTION OF THE APCH COURSE TO RWY 28L.

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.