B757 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 112; Flight Crew Total 10002; Flight Crew Type 112
Troubleshooting; Confusion; Distraction; Situational Awareness
Aircraft Equipment Problem Less Severe; Deviation - Speed All Types; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Landed As Precaution; Flight Crew Returned To Departure Airport; General Maintenance Action
Procedure
I was pilot flying; and the Captain made the 100 knots call and noticed my airspeed indicator was lagging significantly. We confirmed the airspeed with the standby instruments and determined the Captains airspeed indicator was reliable. After rotation and gear retraction I transferred aircraft control to the captain and he continued the takeoff and we cleaned up the aircraft. FO airspeed indicator was 20-30 knots slower than the captains. The captain continued flying and the IRO and I ran the Airspeed Unreliable checklist and we returned to ZZZ and the captain made an overweight landing. We had the fire trucks check the brakes and they applied fans to cool them. We were towed to the gate.
During takeoff roll (first officers leg); First Officer's airspeed indicator lagged Captain's and standby airspeed indicators by up to 30 knots. By 10;000 feet; the airspeed difference was about 20 knots. EICAS indicated Airpspeed Disagree during climbout. Airpeed Disagree checklist led to the Airspeed Unreliable checklist; which was accomplished and we planned for an air return. Overweight Landing Checklist was accomplished and landing weight as reported by ACARS is 226560. Landing was uneventful; yet heroic nonetheless. Other indications during flight were Elev Asym; Rudder Ratio; and Mach Spd Trim.
During the takeoff roll the First Officer's airspeed lagged behind the Captain's so the flight returned to the departure airport. The aircraft had been washed; the pitot system inspected by the IRO; but yellow tape was found inside the First Officer's pitot tube upon inspection after landing.