A DC9-30 on descent at 6000 ft declared an emergency and diverted due to the aircraft rolling to the right with the slats extended and slat disagreement light illuminated.

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Attributes
ACN	430736
Time
Date	199903
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : azo.airport
State Reference	MI
Altitude	msl single value : 6000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : azo.tracon
Operator	common carrier : air carrier
Make Model Name	DC-9 30
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 210 flight time total : 12500 flight time type : 3500
ASRS Report	430736
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance other anomaly other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : slat disagree light other flight crewa
Resolutory Action	controller : issued new clearance flight crew : declared emergency flight crew : overcame equipment problem flight crew : diverted to another airport other
Consequence	other
Factors
Maintenance	performance deficiency : fault isolation performance deficiency : repair
Supplementary
Problem Areas	Aircraft Maintenance Human Performance
Primary Problem	Aircraft

Narrative:

Flight was from detroit, mi, to kalamazoo, mi. Slats were extended on arrival into azo approach airspace to begin confign for landing. As slats extended, aircraft experienced light to moderate tendency to roll to the right. Slat disagreement light was illuminated. Performed company's procedure for slat disagreement, slats retracted and roll stopped. Due to increased runway length requirements, and that we only had 1 hour of fuel on board, an emergency was declared and we returned to dtw. Landing was uneventful with equipment standing by. Callback conversation with reporter revealed the following information: the reporter stated the aircraft had a maintenance history of slat problems. The reporter said the corrective action on the first report was lubrication of the slat tracks. The reporter said the second fix was replacement of the slat track sliding seal. The reporter stated these fixes were not effective. The reporter said the corrective action is unknown due to lack of information from maintenance.

Original NASA ASRS Text

Title: A DC9-30 ON DSCNT AT 6000 FT DECLARED AN EMER AND DIVERTED DUE TO THE ACFT ROLLING TO THE R WITH THE SLATS EXTENDED AND SLAT DISAGREEMENT LIGHT ILLUMINATED.

Narrative: FLT WAS FROM DETROIT, MI, TO KALAMAZOO, MI. SLATS WERE EXTENDED ON ARR INTO AZO APCH AIRSPACE TO BEGIN CONFIGN FOR LNDG. AS SLATS EXTENDED, ACFT EXPERIENCED LIGHT TO MODERATE TENDENCY TO ROLL TO THE R. SLAT DISAGREEMENT LIGHT WAS ILLUMINATED. PERFORMED COMPANY'S PROC FOR SLAT DISAGREEMENT, SLATS RETRACTED AND ROLL STOPPED. DUE TO INCREASED RWY LENGTH REQUIREMENTS, AND THAT WE ONLY HAD 1 HR OF FUEL ON BOARD, AN EMER WAS DECLARED AND WE RETURNED TO DTW. LNDG WAS UNEVENTFUL WITH EQUIP STANDING BY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT HAD A MAINT HISTORY OF SLAT PROBS. THE RPTR SAID THE CORRECTIVE ACTION ON THE FIRST RPT WAS LUBRICATION OF THE SLAT TRACKS. THE RPTR SAID THE SECOND FIX WAS REPLACEMENT OF THE SLAT TRACK SLIDING SEAL. THE RPTR STATED THESE FIXES WERE NOT EFFECTIVE. THE RPTR SAID THE CORRECTIVE ACTION IS UNKNOWN DUE TO LACK OF INFO FROM MAINT.

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.