<< >> NASA ASRS Report 406615, June 1998

A B767-200 at FL350 experienced flap position needles oscillating followed by leading edge amber light and leading edge slat asymmetrical EICAS message.

Attributes
ACN	406615
Time
Date	199806
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : egtt
State Reference	FO
Altitude	msl bound lower : 35000 msl bound upper : 35000
Environment
Light	Night
Aircraft 1
Controlling Facilities	artcc : egtt
Operator	common carrier : air carrier
Make Model Name	B767-200
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	enroute : atlantic
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	406615
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Reaching FL350, flap indicator needle oscillated with clicking sound coming from overhead circuit breaker panel. Followed shortly by the leading edge amber light and leading edge slat asymmetrical EICAS message. Accomplished the leading edge slat asymmetrical procedure. Amber light and EICAS message disappeared. Contacted air carrier dispatch and maintenance. During descent to jfk set system to normal as per maintenance technician. Amber light and EICAS message returned. Performed the leading edge slat asymmetrical procedure. Landing jfk runway 13R with flaps 20 degrees, approach speed 160 KTS. When autoplt was disconnected, aircraft had slight right rolling motion.

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Original NASA ASRS Text

Title: A B767-200 AT FL350 EXPERIENCED FLAP POS NEEDLES OSCILLATING FOLLOWED BY LEADING EDGE AMBER LIGHT AND LEADING EDGE SLAT ASYMMETRICAL EICAS MESSAGE.

Narrative: REACHING FL350, FLAP INDICATOR NEEDLE OSCILLATED WITH CLICKING SOUND COMING FROM OVERHEAD CIRCUIT BREAKER PANEL. FOLLOWED SHORTLY BY THE LEADING EDGE AMBER LIGHT AND LEADING EDGE SLAT ASYMMETRICAL EICAS MESSAGE. ACCOMPLISHED THE LEADING EDGE SLAT ASYMMETRICAL PROC. AMBER LIGHT AND EICAS MESSAGE DISAPPEARED. CONTACTED ACR DISPATCH AND MAINT. DURING DSCNT TO JFK SET SYS TO NORMAL AS PER MAINT TECHNICIAN. AMBER LIGHT AND EICAS MESSAGE RETURNED. PERFORMED THE LEADING EDGE SLAT ASYMMETRICAL PROC. LNDG JFK RWY 13R WITH FLAPS 20 DEGS, APCH SPD 160 KTS. WHEN AUTOPLT WAS DISCONNECTED, ACFT HAD SLIGHT R ROLLING MOTION.

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.