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B767-300 overseas flight suffers an EICAS flap slat warning after departure. Company suggests and flight dumps fuel and diverts to, landing overweight.
| Attributes | |
| ACN | 635877 |
| Time | |
| Date | 200411 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl bound lower : 0 agl bound upper : 15000 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Controlling Facilities | tower : zzz.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B767-300 and 300 ER |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude cruise : level descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : relief pilot |
| Experience | flight time last 90 days : 195 flight time total : 12500 flight time type : 5050 |
| ASRS Report | 635877 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 220 flight time total : 12000 flight time type : 3700 |
| ASRS Report | 635878 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : eicas flap/slat message other flight crewa other flight crewb |
| Resolutory Action | controller : provided flight assist flight crew : diverted to another airport flight crew : landed in emergency condition |
| Consequence | faa : reviewed incident with flight crew other other |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
After departing runway we got a 'leading edge slat asymmetry' EICAS message and a leading edge light on the forward panel for about 30 seconds, then the lights went out. As we retracted the flaps from 5 degrees to 1 degree, both lights came on again and remained illuminated. We climbed to a safe altitude at 235 KTS to stay within the flap operating speeds. Once at a safe altitude, we performed the leading edge slat asymmetry irregular procedure in the flight manual. We also obtained voice communication with dispatch as well as maintenance coordination. After conferring with maintenance and dispatch, it was decided that the safest and most prudent course of action would be to proceed to and land at ZZZ as they had the best maintenance capability to handle the problem according to maintenance and also as we were well over maximum structural landing weight. We were vectored out over the ocean to conduct fuel dumping. We dumped a total of approximately 19000 pounds of fuel. We decided that proceeding inbound to ZZZ and landing overweight was a safe course of action. We landed at 335000 pounds with a 12 KT headwind using flaps 20 degrees as per the leading edge slat asymmetry procedure. Airport crash fire rescue equipment met the aircraft and noted no abnormalities, so we taxied to the gate.
Original NASA ASRS Text
Title: B767-300 OVERSEAS FLT SUFFERS AN EICAS FLAP SLAT WARNING AFTER DEP. COMPANY SUGGESTS AND FLT DUMPS FUEL AND DIVERTS TO, LNDG OVERWT.
Narrative: AFTER DEPARTING RWY WE GOT A 'LEADING EDGE SLAT ASYMMETRY' EICAS MESSAGE AND A LEADING EDGE LIGHT ON THE FORWARD PANEL FOR ABOUT 30 SECONDS, THEN THE LIGHTS WENT OUT. AS WE RETRACTED THE FLAPS FROM 5 DEGS TO 1 DEG, BOTH LIGHTS CAME ON AGAIN AND REMAINED ILLUMINATED. WE CLBED TO A SAFE ALT AT 235 KTS TO STAY WITHIN THE FLAP OPERATING SPDS. ONCE AT A SAFE ALT, WE PERFORMED THE LEADING EDGE SLAT ASYMMETRY IRREGULAR PROC IN THE FLT MANUAL. WE ALSO OBTAINED VOICE COM WITH DISPATCH AS WELL AS MAINT COORD. AFTER CONFERRING WITH MAINT AND DISPATCH, IT WAS DECIDED THAT THE SAFEST AND MOST PRUDENT COURSE OF ACTION WOULD BE TO PROCEED TO AND LAND AT ZZZ AS THEY HAD THE BEST MAINT CAPABILITY TO HANDLE THE PROB ACCORDING TO MAINT AND ALSO AS WE WERE WELL OVER MAX STRUCTURAL LNDG WT. WE WERE VECTORED OUT OVER THE OCEAN TO CONDUCT FUEL DUMPING. WE DUMPED A TOTAL OF APPROX 19000 LBS OF FUEL. WE DECIDED THAT PROCEEDING INBOUND TO ZZZ AND LNDG OVERWT WAS A SAFE COURSE OF ACTION. WE LANDED AT 335000 LBS WITH A 12 KT HEADWIND USING FLAPS 20 DEGS AS PER THE LEADING EDGE SLAT ASYMMETRY PROC. ARPT CFR MET THE ACFT AND NOTED NO ABNORMALITIES, SO WE TAXIED TO THE GATE.
Data retrieved from NASA's ASRS site as of July 2007 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.