A B767-300 leading edge slat sensor malfunctioned after takeoff with the aircraft cleaned up; but be...

Attributes
ACN	991762
Time
Date	201201
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Flight Phase	Initial Climb
Flight Plan	IFR
Component
Aircraft Component	Leading Edge Flap
Person 1
Function	Relief Pilot First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

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.

Original NASA ASRS Text

Title: 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.

Narrative: 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.

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.

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.