B767 captain reported an near midair collision with a C172 on the FMS bridge visual to sfo.

Attributes
ACN	1250784
Time
Date	201503
Local Time Of Day	1201-1800
Place
Locale Reference	SFO.Tower
State Reference	CA
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B767 Undifferentiated or Other Model
Flight Phase	Landing
Aircraft 2
Make Model Name	Skyhawk 172/Cutlass 172
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 127 Flight Crew Total 14176 Flight Crew Type 10756
Events
Anomaly	Conflict NMAC

Narrative:

The first officer was flying an FMS bridge visual to runway 28R when TCAS alerted us to traffic immediately followed by an RA monitor vertical speed. The ADI aircraft position was above the red threat area as the first officer continued to comply with RA as I searched for traffic. I observed a cessna 172 at aircraft position 2 o'clock in close proximity that quickly passed underneath us. The first officer; jumpseat pilot; and I observed that TCAS indicated a miss of 400 ft. After the cessna 172 passed the TCAS announced clear of conflict and the first officer continued the approach to an uneventful landing. The entire event occurred in less than 2 minutes.

Original NASA ASRS Text

Title: B767 Captain reported an NMAC with a C172 on the FMS Bridge Visual to SFO.

Narrative: The first officer was flying an FMS bridge visual to runway 28R when TCAS alerted us to traffic immediately followed by an RA monitor vertical speed. The ADI aircraft position was above the red threat area as the first officer continued to comply with RA as I searched for traffic. I observed a Cessna 172 at aircraft position 2 o'clock in close proximity that quickly passed underneath us. The first officer; jumpseat pilot; and I observed that TCAS indicated a miss of 400 ft. After the Cessna 172 passed the TCAS announced clear of conflict and the first officer continued the approach to an uneventful landing. The entire event occurred in less than 2 minutes.

Data retrieved from NASA's ASRS site 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.