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Partially extended trailing edge flap indication forces B747-400 to dump fuel and return to departure airport for maintenance.
| Attributes | |
| ACN | 810358 |
| Time | |
| Date | 200810 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzzz.airport |
| State Reference | FO |
| Altitude | msl single value : 30000 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzzz.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B747-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : relief pilot |
| Experience | flight time last 90 days : 250 flight time total : 10800 flight time type : 6400 |
| ASRS Report | 810358 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 100 flight time total : 19000 flight time type : 3500 |
| ASRS Report | 810207 |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | aircraft equipment other aircraft equipment : eicas flap dr msg |
| Resolutory Action | other |
| Consequence | other Other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
I had just gone on my rest break and was awakened within 10 mins. We had a flap drive EICAS message. Expanded flaps indicated left inboard trailing edge flap was extended. PF (first officer) slowed below mach .79 and we completed FM procedure. Captain spoke with maintenance control and dispatch and decided to divert to ZZZZ. We coordinated with control for clearance to ZZZZ and clearance to dump fuel. Using jettison checklist; we dumped approximately 35000 pounds beginning at 27000 ft and finishing at 16000 ft. We landed at ZZZZ on runway 16R without inboard trailing edge flaps. Approximately landing gross weight of 620.0 pounds; autobrakes 4; reference 184. Maintenance replaced the flap position transmitter. After approximately 2 hours 45 mins; we took off for ZZZ. Rest of flight was uneventful.
Original NASA ASRS Text
Title: PARTIALLY EXTENDED TRAILING EDGE FLAP INDICATION FORCES B747-400 TO DUMP FUEL AND RETURN TO DEP AIRPORT FOR MAINTENANCE.
Narrative: I HAD JUST GONE ON MY REST BREAK AND WAS AWAKENED WITHIN 10 MINS. WE HAD A FLAP DRIVE EICAS MESSAGE. EXPANDED FLAPS INDICATED L INBOARD TRAILING EDGE FLAP WAS EXTENDED. PF (FO) SLOWED BELOW MACH .79 AND WE COMPLETED FM PROC. CAPT SPOKE WITH MAINT CTL AND DISPATCH AND DECIDED TO DIVERT TO ZZZZ. WE COORDINATED WITH CTL FOR CLRNC TO ZZZZ AND CLRNC TO DUMP FUEL. USING JETTISON CHKLIST; WE DUMPED APPROX 35000 LBS BEGINNING AT 27000 FT AND FINISHING AT 16000 FT. WE LANDED AT ZZZZ ON RWY 16R WITHOUT INBOARD TRAILING EDGE FLAPS. APPROX LNDG GROSS WT OF 620.0 LBS; AUTOBRAKES 4; REF 184. MAINT REPLACED THE FLAP POS XMITTER. AFTER APPROX 2 HRS 45 MINS; WE TOOK OFF FOR ZZZ. REST OF FLT WAS UNEVENTFUL.
Data retrieved from NASA's ASRS site as of May 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.