<< >> NASA ASRS Report 420020, November 1998

An MD11 on initial climb at 3000 ft declared an emergency and diverted due to a flap disagreement warning. Dumped fuel and landed uneventfully.

Attributes
ACN	420020
Time
Date	199811
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : anc
State Reference	AK
Altitude	msl bound lower : 3000 msl bound upper : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : far
Operator	common carrier : air carrier
Make Model Name	DC-10 Undifferentiated or Other Model
Navigation In Use	Other
Flight Phase	climbout : initial other
Route In Use	departure other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 150 flight time total : 16000 flight time type : 600
ASRS Report	420020
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other

Narrative:

Departed anc at XA40Z with a flap disagreement problem. Accomplished flap disagreement checklist. Dumped 93000 pounds of fuel. Emergency was declared and returned back to anc airport. Takeoff weight 550000 pounds. Landing weight 460000 pounds. A flight safety report was filed and turned in to chief pilot. Maintenance repaired the aircraft. To my understanding, company considered this as a maintenance delay. Callback conversation with reporter revealed the following information: the reporter stated the flap disagreement procedures were followed and fuel was dumped to allow landing on a snow covered runway with marginal braking. The reporter said the maintenance action taken was the replacement of a flap position sensor.

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Original NASA ASRS Text

Title: AN MD11 ON INITIAL CLB AT 3000 FT DECLARED AN EMER AND DIVERTED DUE TO A FLAP DISAGREEMENT WARNING. DUMPED FUEL AND LANDED UNEVENTFULLY.

Narrative: DEPARTED ANC AT XA40Z WITH A FLAP DISAGREEMENT PROB. ACCOMPLISHED FLAP DISAGREEMENT CHKLIST. DUMPED 93000 LBS OF FUEL. EMER WAS DECLARED AND RETURNED BACK TO ANC ARPT. TKOF WT 550000 LBS. LNDG WT 460000 LBS. A FLT SAFETY RPT WAS FILED AND TURNED IN TO CHIEF PLT. MAINT REPAIRED THE ACFT. TO MY UNDERSTANDING, COMPANY CONSIDERED THIS AS A MAINT DELAY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE FLAP DISAGREEMENT PROCS WERE FOLLOWED AND FUEL WAS DUMPED TO ALLOW LNDG ON A SNOW COVERED RWY WITH MARGINAL BRAKING. THE RPTR SAID THE MAINT ACTION TAKEN WAS THE REPLACEMENT OF A FLAP POS SENSOR.

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.