Potential conflict between air carrier-widebody transport and unk-small transport.

Attributes
ACN	102879
Time
Date	198901
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sfo
State Reference	CA
Altitude	msl bound lower : 7500 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : oak
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	descent other
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	Small Transport, Low Wing, 2 Turboprop Eng
Flight Phase	cruise other
Flight Plan	VFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 105 flight time total : 16600
ASRS Report	102879
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 6000 flight time type : 500
ASRS Report	103139
Events
Anomaly	conflict : airborne less severe
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	faa : reviewed incident with flight crew
Miss Distance	horizontal : 1500 vertical : 0
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	other

Narrative:

We were descending for a landing at sfo. We were about to intercept the sfo 095 degree right about 20 NM out heading about 240 degrees. We were warned of a jet on our left side, but we did not expect a problem. We were glancing out as we were preparing for landing. We saw an small transport crossing in front of us and we turned behind him. Had we not been looking in that quadrant we may have never seen him. See and be seen barely worked. The other pilot never saw us. It is difficult for a 2-MAN crew to have 1 man staring into the sun looking for a small airplane while preparing to land at a busy airport. Supplemental information from acn 103139: bay gave us a VFR traffic 11 O'clock, I think he said 7500' VFR(?). When I looked out I saw an small transport turbo propeller left to right at our altitude. We made an evasive action hard left turn to miss said aircraft. Bay asked the small transport if he saw a widebody transport. He said no; he had to be blind or a liar. We told bay about the miss. We continued to 8000' MSL, then bay got caught up in trying to raise this small transport with numerous radio calls, but no answer.

Original NASA ASRS Text

Title: POTENTIAL CONFLICT BETWEEN ACR-WDB AND UNK-SMT.

Narrative: WE WERE DSNDING FOR A LNDG AT SFO. WE WERE ABOUT TO INTERCEPT THE SFO 095 DEG R ABOUT 20 NM OUT HDG ABOUT 240 DEGS. WE WERE WARNED OF A JET ON OUR LEFT SIDE, BUT WE DID NOT EXPECT A PROB. WE WERE GLANCING OUT AS WE WERE PREPARING FOR LNDG. WE SAW AN SMT XING IN FRONT OF US AND WE TURNED BEHIND HIM. HAD WE NOT BEEN LOOKING IN THAT QUADRANT WE MAY HAVE NEVER SEEN HIM. SEE AND BE SEEN BARELY WORKED. THE OTHER PLT NEVER SAW US. IT IS DIFFICULT FOR A 2-MAN CREW TO HAVE 1 MAN STARING INTO THE SUN LOOKING FOR A SMALL AIRPLANE WHILE PREPARING TO LAND AT A BUSY ARPT. SUPPLEMENTAL INFO FROM ACN 103139: BAY GAVE US A VFR TFC 11 O'CLOCK, I THINK HE SAID 7500' VFR(?). WHEN I LOOKED OUT I SAW AN SMT TURBO PROP LEFT TO RIGHT AT OUR ALT. WE MADE AN EVASIVE ACTION HARD LEFT TURN TO MISS SAID ACFT. BAY ASKED THE SMT IF HE SAW A WDB. HE SAID NO; HE HAD TO BE BLIND OR A LIAR. WE TOLD BAY ABOUT THE MISS. WE CONTINUED TO 8000' MSL, THEN BAY GOT CAUGHT UP IN TRYING TO RAISE THIS SMT WITH NUMEROUS RADIO CALLS, BUT NO ANSWER.

Data retrieved from NASA's ASRS site as of August 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.