An air carrier large transport had a leading edge slat asymmetry problem.

Attributes
ACN	263140
Time
Date	199402
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : esl airport : dca
State Reference	WV
Altitude	msl bound lower : 23000 msl bound upper : 23000
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : atp pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 23000 flight time type : 150
ASRS Report	263140
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical non adherence other other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Shortly after level off, we received a warning tone, a caution, and an EFIS message that we had a leading edge slat asymmetry. We accomplished the proper checklists and realized that we would have to make a leading edge up/trailing edge flap 20 degree landing. I decided to continue to dca and land on runway 36 there since it was only wet with good braking. We had no performance data for this condition, but we were well under the flaps 25 degrees 10 KTS tailwind, wet gross weight limit. The other runways in the vicinity had ice and snow on them and, while they were longer, I felt that a good braking surface was more important. The landing was uneventful.

Original NASA ASRS Text

Title: AN ACR LGT HAD A LEADING EDGE SLAT ASYMMETRY PROB.

Narrative: SHORTLY AFTER LEVEL OFF, WE RECEIVED A WARNING TONE, A CAUTION, AND AN EFIS MESSAGE THAT WE HAD A LEADING EDGE SLAT ASYMMETRY. WE ACCOMPLISHED THE PROPER CHKLISTS AND REALIZED THAT WE WOULD HAVE TO MAKE A LEADING EDGE UP/TRAILING EDGE FLAP 20 DEG LNDG. I DECIDED TO CONTINUE TO DCA AND LAND ON RWY 36 THERE SINCE IT WAS ONLY WET WITH GOOD BRAKING. WE HAD NO PERFORMANCE DATA FOR THIS CONDITION, BUT WE WERE WELL UNDER THE FLAPS 25 DEGS 10 KTS TAILWIND, WET GROSS WT LIMIT. THE OTHER RWYS IN THE VICINITY HAD ICE AND SNOW ON THEM AND, WHILE THEY WERE LONGER, I FELT THAT A GOOD BRAKING SURFACE WAS MORE IMPORTANT. THE LNDG WAS UNEVENTFUL.

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.