Heavy Transport
Flight Crew Air Transport Pilot (ATP)
Training / Qualification
Aircraft Equipment Problem Less Severe
Flight Crew Became Reoriented; Flight Crew Overcame Equipment Problem
Human Factors; Aircraft
Fully configured; on a stable Flaps 35 approach; tracking the localizer and glideslope; we had a pitch attitude of 7 degrees and the AOA in the HUD was well out of the 'approach band' to the slow side. The computed FMS approach speed for a 325k landing was 140 knots. We bugged the approach speed to 145-146 knots to bring the AOA to the middle of the approach band and pitch attitude to 4.5-5 degrees (tracking a 3 degree glideslope.) A normal safe landing followed.  We had the same aircraft and issue the day before on approach. On taxi from this flight we had ADC #1 and ADC #2 fail. This was written up and signed off before our return flight. We had no other maintenance issues on the flight. The training we are doing to crosscheck the AOA with our current pitch and power setting is working. Our training kicked in and made this a non-event. Both; myself with the AOA; and the First Officer without the AOA (but he has an AOA background form his past experience) were able to recognize our pitch attitude was too high and make the necessary adjustments and land the aircraft safely.
Captain experiences an airspeed discrepancy during approach between AOA and IAS with the AOA indicating slow. Airspeed is increased five knots bring the the AOA into the proper range. ADC malfunctions had been reported the previous day and addressed by Maintenance.