B767-300 and 300 ER
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical
Flight Crew Returned To Departure Airport; Flight Crew FLC complied w / Automation / Advisory; Flight Crew Landed in Emergency Condition; General Maintenance Action; General Declared Emergency
Aircraft
After takeoff during flap retraction; EICAS message LE SLAT Asymmetry along with LE Asymmetry light. Accomplished QRH procedures and landed flaps 20 with QRH procedures. Declared emergency due to secondary flight control problem and over weight landing. Landing by First Officer was uneventful; smooth and well done. Entire runway length was used with checklist and to reduce heating of brakes. Aircraft was inspected on runway by Airfield Rescue and Fire Fighter personnel and deemed safe to return to gate. We changed aircraft and proceeded to our filed destination. First Officer was flying entire flight. Captain and Relief Pilot accomplished all applicable checklists. Emergency declared with Departure. Aircraft returned to the departure airport for landing and corrective maintenance.
Received Flap Assymetry EICAS message with flap handle up several minutes after aircraft cleanup.
A B767-300 leading edge slat sensor malfunctioned after takeoff with the aircraft cleaned up; but because of the LE SLAT Assymetry EICAS warning an emergency was declared and the flight returned to the departure airport.