<< >> NASA ASRS Report 989843, January 2012

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.

Attributes
ACN	989843
Time
Date	201201
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZZ.Airport
State Reference	FO
Environment
Flight Conditions	IMC
Aircraft 1
Make Model Name	B747-400
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Component
Aircraft Component	Airspeed Indicator
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 200 Flight Crew Total 30000 Flight Crew Type 5000
Person 2
Function	First Officer Pilot Not Flying
Experience	Flight Crew Last 90 Days 230 Flight Crew Total 12000 Flight Crew Type 4500
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

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.

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Original NASA ASRS Text

Title: 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.

Narrative: 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.

Data retrieved from NASA's ASRS site as of July 2013 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.