B757 flight crew has an EICAS warning regarding flap asymmetry; declares an emergency and lands.

Attributes
ACN	697026
Time
Date	200605
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Controlling Facilities	tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	697026
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	aircraft equipment other aircraft equipment : eicas warning other flight crewa other flight crewb
Resolutory Action	flight crew : landed as precaution flight crew : overcame equipment problem
Consequence	other
Supplementary
Problem Areas	Company Flight Crew Human Performance Aircraft
Primary Problem	Aircraft

Narrative:

Leading edge slat problem/asymmetry disagreement; used QRH. Checklist is confusing; should re-write. The all-night repos flight was uneventful until we selected flaps 1 degree for approach. The EICAS showed: leading edge slat disagreement and leading edge slat asymmetry faults. We abandoned the approach and sorted out the appropriate checklist. After completing the leading edge slat asymmetry checklist; we declared the emergency; advised maintenance control and dispatch; and landed uneventfully.

Original NASA ASRS Text

Title: B757 FLT CREW HAS AN EICAS WARNING REGARDING FLAP ASYMMETRY; DECLARES AN EMER AND LANDS.

Narrative: LEADING EDGE SLAT PROB/ASYMMETRY DISAGREEMENT; USED QRH. CHKLIST IS CONFUSING; SHOULD RE-WRITE. THE ALL-NIGHT REPOS FLT WAS UNEVENTFUL UNTIL WE SELECTED FLAPS 1 DEG FOR APCH. THE EICAS SHOWED: LEADING EDGE SLAT DISAGREEMENT AND LEADING EDGE SLAT ASYMMETRY FAULTS. WE ABANDONED THE APCH AND SORTED OUT THE APPROPRIATE CHKLIST. AFTER COMPLETING THE LEADING EDGE SLAT ASYMMETRY CHKLIST; WE DECLARED THE EMER; ADVISED MAINT CTL AND DISPATCH; AND LANDED UNEVENTFULLY.

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.