B757 captain reported receiving an apparently false TCAS RA on short final at sfo runway 28R on two ...

Attributes
ACN	1473311
Time
Date	201708
Place
Locale Reference	SFO.Tower
State Reference	CA
Environment
Flight Conditions	IMC
Aircraft 1
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Flight Plan	IFR
Component
Aircraft Component	Traffic Collision Avoidance System (TCAS)
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Total 2940 Flight Crew Type 991
Events
Anomaly	ATC Issue All Types Aircraft Equipment Problem Less Severe

Narrative:

We were cleared for ILS runway 28R [at sfo] and assigned 180 KTS to axmul. Before cepin; we noticed a TCAS target 2 1/2 miles in front and 800 feet below us. Being IMC; we were concerned about the closure rate. As [we] slowed; ATC told us to maintain 180 KTS to axmul. We did. As we broke out of the clouds; we noticed no traffic ahead of us on either 28L or 28R.on [a prior similar approach;] I executed a go-around because of a TCAS RA at 800 feet on runway 28R. When I talked to the tower [later] that day; he informed me there was no aircraft below us. I would like someone to explain to me why I'm getting ghost targets on runway 28R going into san francisco. I'm concerned safety is being jeopardized and this matter should be looked into.

Original NASA ASRS Text

Title: B757 Captain reported receiving an apparently false TCAS RA on short final at SFO Runway 28R on two approaches on different days. On the first approach; the Captain executed a go-around.

Narrative: We were cleared for ILS runway 28R [at SFO] and assigned 180 KTS to AXMUL. Before CEPIN; we noticed a TCAS target 2 1/2 miles in front and 800 feet below us. Being IMC; we were concerned about the closure rate. As [we] slowed; ATC told us to maintain 180 KTS to AXMUL. We did. As we broke out of the clouds; we noticed no traffic ahead of us on either 28L or 28R.On [a prior similar approach;] I executed a go-around because of a TCAS RA at 800 feet on runway 28R. When I talked to the Tower [later] that day; he informed me there was no aircraft below us. I would like someone to explain to me why I'm getting ghost targets on runway 28R going into San Francisco. I'm concerned safety is being jeopardized and this matter should be looked into.

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.

B757 captain reported receiving an apparently false TCAS RA on short final at sfo runway 28R on two approaches on different days. On the first approach; the captain executed a go-around.