B757 takes evasive action in response to TCASII RA on final approach to san.

Attributes
ACN	419873
Time
Date	199811
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : san
State Reference	CA
Altitude	msl bound lower : 1600 msl bound upper : 1600
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	landing other
Route In Use	approach : straight in approach : visual
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Twin Beech 18
Operating Under FAR Part	Part 91
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 150 flight time total : 12500 flight time type : 1100
ASRS Report	419873
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial
Events
Anomaly	conflict : nmac non adherence : required legal separation other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Consequence	faa : reviewed incident with flight crew
Miss Distance	vertical : 200
Supplementary
Air Traffic Incident	Operational Error

Narrative:

On a clear day 15+ mi visibility, on an approximately 4-5 mi final to runway 27 at san, on my leg to fly, our TCASII picked up a target at 12 O'clock position, 2 mi, 500 ft vertical separation as we descended through 1800 ft MSL. The aircraft was configured gear down, flaps 30 degrees with engines spooled, descent rate 800 FPM. We received a TCASII TA, 'traffic, traffic, traffic,' followed immediately by an RA, 'climb, climb, climb.' I immediately rotated to the commanded rate of climb, which was 2200 FPM, about 20 degrees nose up. The escape maneuver was initiated at 1600 ft MSL. The first officer and I never saw the traffic and the last separation I saw on TCASII was 200 ft vertical. While talking with a supervisor from san tower on the phone, I was advised that the other aircraft was a BE18 and had been operating in that area for a couple of days. I thought that the BE18 shouldn't have been anywhere near the centerline of runway 27 and 1600 ft MSL, 4-5 mi from the airport. The supervisor agreed and thought the BE18 had strayed too close to the final inadvertently.

Original NASA ASRS Text

Title: B757 TAKES EVASIVE ACTION IN RESPONSE TO TCASII RA ON FINAL APCH TO SAN.

Narrative: ON A CLR DAY 15+ MI VISIBILITY, ON AN APPROX 4-5 MI FINAL TO RWY 27 AT SAN, ON MY LEG TO FLY, OUR TCASII PICKED UP A TARGET AT 12 O'CLOCK POS, 2 MI, 500 FT VERT SEPARATION AS WE DSNDED THROUGH 1800 FT MSL. THE ACFT WAS CONFIGURED GEAR DOWN, FLAPS 30 DEGS WITH ENGS SPOOLED, DSCNT RATE 800 FPM. WE RECEIVED A TCASII TA, 'TFC, TFC, TFC,' FOLLOWED IMMEDIATELY BY AN RA, 'CLB, CLB, CLB.' I IMMEDIATELY ROTATED TO THE COMMANDED RATE OF CLB, WHICH WAS 2200 FPM, ABOUT 20 DEGS NOSE UP. THE ESCAPE MANEUVER WAS INITIATED AT 1600 FT MSL. THE FO AND I NEVER SAW THE TFC AND THE LAST SEPARATION I SAW ON TCASII WAS 200 FT VERT. WHILE TALKING WITH A SUPVR FROM SAN TWR ON THE PHONE, I WAS ADVISED THAT THE OTHER ACFT WAS A BE18 AND HAD BEEN OPERATING IN THAT AREA FOR A COUPLE OF DAYS. I THOUGHT THAT THE BE18 SHOULDN'T HAVE BEEN ANYWHERE NEAR THE CTRLINE OF RWY 27 AND 1600 FT MSL, 4-5 MI FROM THE ARPT. THE SUPVR AGREED AND THOUGHT THE BE18 HAD STRAYED TOO CLOSE TO THE FINAL INADVERTENTLY.

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.