A319
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 245; Flight Crew Total 16500; Flight Crew Type 1600
Distraction; Human-Machine Interface
Aircraft Equipment Problem Less Severe
Air Traffic Control Issued New Clearance; General Maintenance Action
Human Factors; Aircraft
We were flying the FMS Bridge Visual to Runway 28R at SFO. When we put gear down; we received several ECAM messages all of which appeared related to the air/ground landing gear sensor. The ECAMs we were reviewing in rapid succession below 2;500 FT and during a very high workload phase of flight included: Anti-Ice Standby pitot; Cabin Pressure Landing Elevation Fault and just then the FMC 'dumped!'We quickly realized we could no longer accomplish the FMS visual without the FMS being initialized and reinstalling the approach; which would have dramatically increased workload during what was already a very busy approach. We felt the greatest threat was having the First Officer go 'heads down' at this late a stage in the approach. Therefore; we called the Tower and reported our loss of navigation equipment and inability to complete the FMS approach. We advised we had preceding aircraft and the runway in sight. He then cleared us for a Visual Approach to Runway 28R. After landing; as we were pulling into the gate; we received a Landing Gear System Disagree ECAM. We contacted Maintenance Control and Dispatch as well as Line Maintenance. Due to time constraints we did not attempt to reinitialize the ACARS and send maintenance codes for the affected systems. We instead printed out the last leg ECAM report; gave it to the Line Mechanic and asked Maintenance Control to put the squawks into the maintenance computer.
While below 2;500 FT MSL flying the BRIJJ RNAV Visual Approach to SFO; an A319 flight crew received multiple ECAM warnings related to the possible failure of the air/ground squat switch. In addition their FMS failed leaving them without RNAV capability. They asked for and received a 'conventional' Visual Approach Clearance from the Tower and landed uneventfully.