B757-200 captain reports airspeed indicator failure during first officer takeoff. First officer rota...

Narrative:

Prior to takeoff we decided to use max power instead of derate 2 as showers were approaching the field. Winds were 110/23kt and the weight of the aircraft was 172000lbs. ATC changed runways on us. First officer asked for takeoff thrust. I started setting thrust and scanning at my airspeed indicator. As I was finishing setting thrust I felt it was taking longer than usual for the airspeed to come alive. It happened fast. At this point first officer was rotating the airplane. It was too late to reject. I said 'lost my airspeed; continue'; looked at his airspeed and standby airspeed and they appeared normal. I told him to continue flying the airplane. We cleaned the airplane (gear and flaps up). On climb out we got rudder ratio and mach speed trim EICAS messages. My airspeed started to increase slowly but still disagreed with first officer's and standby airspeed indicator. First officer had airplane under control. We tried engaging center autopilot; but would not work. Autopilot disconnect warning horn went off. First officer could not silence it; I tried it from my side and it worked. We tried the right autopilot and engaged on second attempt. EICAS message IAS disagree came on as my airspeed indicator was fluctuating. We decided to go back to departure airport. Controller told us our speed and altitude; which we agreed (standby and first officer airspeed indicator). He gave us vectors for a visual for uneventful landing.

Original NASA ASRS Text

Title: B757-200 Captain reports airspeed indicator failure during First Officer takeoff. First Officer rotates at Vr and flight returns for uneventful landing at departure airport.

Narrative: Prior to takeoff we decided to use max power instead of Derate 2 as showers were approaching the field. Winds were 110/23kt and the weight of the aircraft was 172000lbs. ATC changed runways on us. First Officer asked for takeoff thrust. I started setting thrust and scanning at my airspeed indicator. As I was finishing setting thrust I felt it was taking longer than usual for the airspeed to come alive. It happened fast. At this point First Officer was rotating the airplane. It was too late to reject. I said 'lost my airspeed; continue'; looked at his airspeed and standby airspeed and they appeared normal. I told him to continue flying the airplane. We cleaned the airplane (gear and flaps up). On climb out we got rudder ratio and Mach speed trim EICAS messages. My airspeed started to increase slowly but still disagreed with First Officer's and standby airspeed indicator. First Officer had airplane under control. We tried engaging center autopilot; but would not work. Autopilot disconnect warning horn went off. First Officer could not silence it; I tried it from my side and it worked. We tried the right autopilot and engaged on second attempt. EICAS message IAS disagree came on as my airspeed indicator was fluctuating. We decided to go back to departure airport. Controller told us our speed and altitude; which we agreed (standby and First Officer airspeed indicator). He gave us vectors for a visual for uneventful landing.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	846186
Time
Date	200908
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Route In Use	None
Flight Plan	IFR
Component
Aircraft Component	Airspeed Indicator
Person 1
Function	Captain Pilot Not Flying
Experience	Flight Crew Last 90 Days 100 Flight Crew Total 12000 Flight Crew Type 5000
Events
Anomaly	Aircraft Equipment Problem Critical

B757-200 captain reports airspeed indicator failure during first officer takeoff. First officer rotates at vr and flight returns for uneventful landing at departure airport.