A B757-200 after takeoff with flaps retracted had leading edge slat asymmetric warning. Declared an emergency, landed flaps 20 degrees with leading edge slats retracted caused by a failure or misadjusted slat sensor.

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Attributes
ACN	475839
Time
Date	200006
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dfw.airport
State Reference	TX
Altitude	msl bound lower : 0 msl bound upper : 11000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : d10.tracon
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	approach : straight in
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	475839
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : multi engine pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : eicas warning other flight crewa other flight crewb
Resolutory Action	flight crew : declared emergency
Consequence	other other
Supplementary
Problem Areas	Maintenance Human Performance Flight Crew Human Performance Aircraft
Primary Problem	Aircraft

Narrative:

After takeoff from sju, as flaps reached zero, leading edge flap asymmetry annunciated on EICAS. Inspected slats. Slats appeared fully stowed. Consulted maintenance regarding continuing flight. Maintenance concurred with me (the captain) on continuing to dfw. Prior to arrival, fully briefed for abnormal flaps 20 degree landing. As a precaution, due to the nature of the problem, pre-existing placarded thrust reverser, and part 1 section 19 emergency definitions and requirements, we declared an emergency for the landing. We informed ATC of the problem and our opinion of the precautionary nature of our actions. We had the flight attendants prepare the cabin for an emergency landing. We used a long final (a long runway, runway 17R) and landed uneventfully. Callback conversation with reporter revealed the following information: the reporter stated the cause of the asymmetric warning was a leading edge slat sensor failure or the sensor was out of adjustment.

Original NASA ASRS Text

Title: A B757-200 AFTER TKOF WITH FLAPS RETRACTED HAD LEADING EDGE SLAT ASYMMETRIC WARNING. DECLARED AN EMER, LANDED FLAPS 20 DEGS WITH LEADING EDGE SLATS RETRACTED CAUSED BY A FAILURE OR MISADJUSTED SLAT SENSOR.

Narrative: AFTER TKOF FROM SJU, AS FLAPS REACHED ZERO, LEADING EDGE FLAP ASYMMETRY ANNUNCIATED ON EICAS. INSPECTED SLATS. SLATS APPEARED FULLY STOWED. CONSULTED MAINT REGARDING CONTINUING FLT. MAINT CONCURRED WITH ME (THE CAPT) ON CONTINUING TO DFW. PRIOR TO ARR, FULLY BRIEFED FOR ABNORMAL FLAPS 20 DEG LNDG. AS A PRECAUTION, DUE TO THE NATURE OF THE PROB, PRE-EXISTING PLACARDED THRUST REVERSER, AND PART 1 SECTION 19 EMER DEFINITIONS AND REQUIREMENTS, WE DECLARED AN EMER FOR THE LNDG. WE INFORMED ATC OF THE PROB AND OUR OPINION OF THE PRECAUTIONARY NATURE OF OUR ACTIONS. WE HAD THE FLT ATTENDANTS PREPARE THE CABIN FOR AN EMER LNDG. WE USED A LONG FINAL (A LONG RWY, RWY 17R) AND LANDED UNEVENTFULLY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CAUSE OF THE ASYMMETRIC WARNING WAS A LEADING EDGE SLAT SENSOR FAILURE OR THE SENSOR WAS OUT OF ADJUSTMENT.

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.