Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 200; Flight Crew Total 30000; Flight Crew Type 5000
Workload; Human-Machine Interface; Time Pressure; Troubleshooting
Aircraft Equipment Problem Critical
Flight Crew Overcame Equipment Problem; General Declared Emergency
Aircraft
At 4;000 FT and 12 minutes from touchdown we received an EICAS message 'airspeed disagree.' We noted the Captain's and Standby ASIs were in agreement and the First Officer's was 10-12 KTS lower. The QRC directed to turn off flight directors; autopilot and auto throttle and land at nearest suitable airport. We were in IMC and weather reported for Runway 34L was IMC. Declared an emergency and continued the approach with raw data. At 1;200 FT lost the glide slope indication on the Captain's instruments so I flew cross cockpit using the First Officer's GSI until the Captain's glide slope indication came back at around 900 FT. Broke out at 400 FT and landed making the second high speed turnoff uneventfully.
[No substantive additional information was included in the secondary narrative.]
A B747-400 flight crew complied with the appropriate QRC; declared an emergency and landed uneventfully in IMC after receiving an airspeed disagree EICAS warning while being sequenced for landing at their destination.