Air carrier X TCASII RA with VFR C172 while on visual approach. No evasive action taken. See and avo...

Attributes
ACN	293323
Time
Date	199501
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : pie
State Reference	FL
Altitude	msl bound lower : 1000 msl bound upper : 1500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : pie
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Operator	general aviation : personal
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Route In Use	enroute : direct
Flight Plan	VFR
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Experience	controller military : 10 controller non radar : 2
ASRS Report	293323
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	conflict : airborne less severe
Independent Detector	aircraft equipment other aircraft equipment : unspecified other controllera
Resolutory Action	none taken : anomaly accepted
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 1500 vertical : 300
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

Air carrier X, a B757, was on the north bay visual (visual for noise abatement purposes) on a 4 mi final for runway 17L at pie. Y, a C172, was transitioning the airport 3-4 mi east of the field from south to north. 757 was issued traffic on C172 who was at 1000 ft. The B757 was at 1500 ft at the time. The C172 reported the B757 in sight and was east of his position. The B757 reported a TCASII alert a mi later. I talked to the pilot and he reported the C172 300 ft below him I explained since we are not class C airspace, we need only have target resolution. He did not climb and was able to land without incident.

Original NASA ASRS Text

Title: ACR X TCASII RA WITH VFR C172 WHILE ON VISUAL APCH. NO EVASIVE ACTION TAKEN. SEE AND AVOID CONCEPT.

Narrative: ACR X, A B757, WAS ON THE NORTH BAY VISUAL (VISUAL FOR NOISE ABATEMENT PURPOSES) ON A 4 MI FINAL FOR RWY 17L AT PIE. Y, A C172, WAS TRANSITIONING THE ARPT 3-4 MI E OF THE FIELD FROM S TO N. 757 WAS ISSUED TFC ON C172 WHO WAS AT 1000 FT. THE B757 WAS AT 1500 FT AT THE TIME. THE C172 RPTED THE B757 IN SIGHT AND WAS E OF HIS POS. THE B757 RPTED A TCASII ALERT A MI LATER. I TALKED TO THE PLT AND HE RPTED THE C172 300 FT BELOW HIM I EXPLAINED SINCE WE ARE NOT CLASS C AIRSPACE, WE NEED ONLY HAVE TARGET RESOLUTION. HE DID NOT CLB AND WAS ABLE TO LAND WITHOUT INCIDENT.

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 X TCASII RA with VFR C172 while on visual approach. No evasive action taken. See and avoid concept.