Narrative:

Everything was normal until 5 mi final on approach to landing. The first officer (receiving a requalification oe) called for flaps 30 degrees; the planned landing confign. The captain lifted the flap handle from the flap 25 degree detent and selected flaps 30 degrees. An amber EICAS message (leading edge slat asymmetry) appeared accompanied by the master caution light; chime; and illumination of the amber leading edge light on the forward instrument panel. The flight crew coordinated a go around in visual conditions with tower; followed by radar vectors south of the airport and runway 10 approach. Fuel on board allowed 1 hour and 30 mins endurance. WX was VMC. We ACARS'd dispatch and maintenance and we advised the purser and then the passenger of the reason for our go around and the expectation of an uneventful; routine landing after we will have completed the appropriate checklist procedures. The first officer flew the aircraft and handled ATC while the captain spoke with dispatch. We had a full aircraft; including 2 offline regional airline pilots. We had the purser call a B767 captain who was riding in the cabin to visually inspect the leading edge slats and then to come forward to trade seats with one of the offline pilots in order to assist the flight crew with the checklist. Dispatch could not contact maintenance despite repeated attempts. After having completed the appropriate flight manual procedure with everyone's concurrence; control of the aircraft was xferred from the first officer to the captain to fly the approach and landing; which were uneventful. We taxied to the gate leaving the flaps and slats in the landing position for maintenance to inspect.

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Original NASA ASRS Text

Title: B767-300 EICAS INDICATED 'LE SLAT ASYMMETRY' WHILE ON APCH. FLT CREW EXECUTED GAR FOR COMPLETING CHECKLIST PROCEDURES AND RETURNED FOR LNDG.

Narrative: EVERYTHING WAS NORMAL UNTIL 5 MI FINAL ON APCH TO LNDG. THE FO (RECEIVING A REQUALIFICATION OE) CALLED FOR FLAPS 30 DEGS; THE PLANNED LNDG CONFIGN. THE CAPT LIFTED THE FLAP HANDLE FROM THE FLAP 25 DEG DETENT AND SELECTED FLAPS 30 DEGS. AN AMBER EICAS MESSAGE (LEADING EDGE SLAT ASYMMETRY) APPEARED ACCOMPANIED BY THE MASTER CAUTION LIGHT; CHIME; AND ILLUMINATION OF THE AMBER LEADING EDGE LIGHT ON THE FORWARD INST PANEL. THE FLT CREW COORDINATED A GAR IN VISUAL CONDITIONS WITH TWR; FOLLOWED BY RADAR VECTORS S OF THE ARPT AND RWY 10 APCH. FUEL ON BOARD ALLOWED 1 HR AND 30 MINS ENDURANCE. WX WAS VMC. WE ACARS'D DISPATCH AND MAINT AND WE ADVISED THE PURSER AND THEN THE PAX OF THE REASON FOR OUR GAR AND THE EXPECTATION OF AN UNEVENTFUL; ROUTINE LNDG AFTER WE WILL HAVE COMPLETED THE APPROPRIATE CHKLIST PROCS. THE FO FLEW THE ACFT AND HANDLED ATC WHILE THE CAPT SPOKE WITH DISPATCH. WE HAD A FULL ACFT; INCLUDING 2 OFFLINE REGIONAL AIRLINE PLTS. WE HAD THE PURSER CALL A B767 CAPT WHO WAS RIDING IN THE CABIN TO VISUALLY INSPECT THE LEADING EDGE SLATS AND THEN TO COME FORWARD TO TRADE SEATS WITH ONE OF THE OFFLINE PLTS IN ORDER TO ASSIST THE FLT CREW WITH THE CHKLIST. DISPATCH COULD NOT CONTACT MAINT DESPITE REPEATED ATTEMPTS. AFTER HAVING COMPLETED THE APPROPRIATE FLT MANUAL PROC WITH EVERYONE'S CONCURRENCE; CTL OF THE ACFT WAS XFERRED FROM THE FO TO THE CAPT TO FLY THE APCH AND LNDG; WHICH WERE UNEVENTFUL. WE TAXIED TO THE GATE LEAVING THE FLAPS AND SLATS IN THE LNDG POS FOR MAINT TO INSPECT.

Data retrieved from NASA's ASRS site as of January 2009 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.