<< >> NASA ASRS Report 280253, August 1994

Slat malfunction.

Attributes
ACN	280253
Time
Date	199408
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mkc
State Reference	MO
Altitude	msl bound lower : 5000 msl bound upper : 15000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Route In Use	enroute airway : zkc
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 220 flight time total : 20000 flight time type : 220
ASRS Report	280253
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	none taken : unable other
Consequence	Other Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

After departing stl for sfo, and after retracting gear and flaps then climbing through 5000 ft, the leading edge in-transit light came on. There were no other indications on the engineer's panel. We visually confirmed that the leading edge devices were indeed extended. We continued climbing and maintained less than 250 KTS. We lowered the flaps to 40 degrees. The in-transit light went out, and the leading edge extended right (green) came on. On the engineer's panel, all the 14 green lights came on, and the slat position indicator went then to 30 degrees. We then raised the flaps. The trailing edge flaps came up, but the leading edge in-transit light came on again, and remained on. The majority of the 14 green lights remained on. There was no adverse roll. The leading edge devices remained extended. We lowered and raised the flaps one more time, but without success. We went through all the pertinent checklists to lock the slats down, returned to stl and did an overweight landing (362000 pounds) with no problems. It was a smooth, gentle landing. We did not declare an emergency.

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Original NASA ASRS Text

Title: SLAT MALFUNCTION.

Narrative: AFTER DEPARTING STL FOR SFO, AND AFTER RETRACTING GEAR AND FLAPS THEN CLBING THROUGH 5000 FT, THE LEADING EDGE IN-TRANSIT LIGHT CAME ON. THERE WERE NO OTHER INDICATIONS ON THE ENGINEER'S PANEL. WE VISUALLY CONFIRMED THAT THE LEADING EDGE DEVICES WERE INDEED EXTENDED. WE CONTINUED CLBING AND MAINTAINED LESS THAN 250 KTS. WE LOWERED THE FLAPS TO 40 DEGS. THE IN-TRANSIT LIGHT WENT OUT, AND THE LEADING EDGE EXTENDED R (GREEN) CAME ON. ON THE ENGINEER'S PANEL, ALL THE 14 GREEN LIGHTS CAME ON, AND THE SLAT POS INDICATOR WENT THEN TO 30 DEGS. WE THEN RAISED THE FLAPS. THE TRAILING EDGE FLAPS CAME UP, BUT THE LEADING EDGE IN-TRANSIT LIGHT CAME ON AGAIN, AND REMAINED ON. THE MAJORITY OF THE 14 GREEN LIGHTS REMAINED ON. THERE WAS NO ADVERSE ROLL. THE LEADING EDGE DEVICES REMAINED EXTENDED. WE LOWERED AND RAISED THE FLAPS ONE MORE TIME, BUT WITHOUT SUCCESS. WE WENT THROUGH ALL THE PERTINENT CHKLISTS TO LOCK THE SLATS DOWN, RETURNED TO STL AND DID AN OVERWT LNDG (362000 LBS) WITH NO PROBS. IT WAS A SMOOTH, GENTLE LNDG. WE DID NOT DECLARE AN EMER.

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.