B767 crew had EICAS warning of leading edge flap asymmetry after takeoff at sfo.

Attributes
ACN	520479
Time
Date	200108
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sfo.airport
State Reference	CA
Environment
Flight Conditions	VMC
Aircraft 1
Controlling Facilities	tracon : o90.tracon tower : sfo.tower tower : den.tower
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time type : 786
ASRS Report	520479
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : eicas other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : landed in emergency condition flight crew : declared emergency other
Consequence	other other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Departing sfo runway 1R, flaps 15 degrees, normal takeoff. Upon flap retraction from 1 degree to up, the leading edge flap asymmetry EICAS came on. There was no adverse yaw or roll felt. Followed irregular procedure in flight manual. Takeoff weight was about 230000 pounds. Talked to air carrier maintenance and dispatch and coordination a return to sfo. We burned about 20000 pounds of gas to reduce landing weight. I determined that an overweight landing was deemed as safe as continuing to fly with a secondary flight control problem. Emergency vehicles were standing by but no assist was required. Shut down engines and towed to gate because of hot brake considerations. A flight manager met us at gate for quick debriefing. Got us a new aircraft and we proceeded to bos.

Original NASA ASRS Text

Title: B767 CREW HAD EICAS WARNING OF LEADING EDGE FLAP ASYMMETRY AFTER TKOF AT SFO.

Narrative: DEPARTING SFO RWY 1R, FLAPS 15 DEGS, NORMAL TKOF. UPON FLAP RETRACTION FROM 1 DEG TO UP, THE LEADING EDGE FLAP ASYMMETRY EICAS CAME ON. THERE WAS NO ADVERSE YAW OR ROLL FELT. FOLLOWED IRREGULAR PROC IN FLT MANUAL. TKOF WT WAS ABOUT 230000 LBS. TALKED TO ACR MAINT AND DISPATCH AND COORD A RETURN TO SFO. WE BURNED ABOUT 20000 LBS OF GAS TO REDUCE LNDG WT. I DETERMINED THAT AN OVERWT LNDG WAS DEEMED AS SAFE AS CONTINUING TO FLY WITH A SECONDARY FLT CTL PROB. EMER VEHICLES WERE STANDING BY BUT NO ASSIST WAS REQUIRED. SHUT DOWN ENGS AND TOWED TO GATE BECAUSE OF HOT BRAKE CONSIDERATIONS. A FLT MGR MET US AT GATE FOR QUICK DEBRIEFING. GOT US A NEW ACFT AND WE PROCEEDED TO BOS.

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.