A B737-200 had leading edge slat disagree warning light on continuously.

Attributes
ACN	365623
Time
Date	199704
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz
State Reference	US
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-200
Operating Under FAR Part	Part 121
Flight Phase	other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
ASRS Report	365623
Person 2
Affiliation	company : air carrier
Function	other personnel other
Qualification	other other : other
Events
Anomaly	aircraft equipment problem : critical non adherence : published procedure non adherence : far other anomaly other
Independent Detector	other flight crewa other other : unspecified cockpit
Resolutory Action	other
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

On apr xb, 1997, advised that on apr X,a 1997, on aircraft I worked had a slat disagree light. After investigation, #4 slat adjustment bolts were not cotter keyed. Callback conversation with reporter revealed the following information: the slat was installed per the maintenance manual and the first flight after installation the slat disagree warning light was illuminated continuously. Down-line station found the slat adjustment bolts loose and no cotter pins installed in the slat. The reporter states when installing the slat no mismatch occurred so it was not necessary to readjust the main track adjustment bolts. The maintenance manual stated the bolts were already torqued and the cotter pins installed on a serviceable slat. The shop that overhauled and made the slat serviceable had the practice of releasing the slat for installation with the main track adjustment bolts loose and the cotter pins not installed. The shop noted this deviation with a tag attached to the slat. No tag was seen by either mechanic or the presence of the tag and slat confign noted in the maintenance manual. The mismatched slat was the cause of the slat disagree warning light on continuously.

Original NASA ASRS Text

Title: A B737-200 HAD LEADING EDGE SLAT DISAGREE WARNING LIGHT ON CONTINUOUSLY.

Narrative: ON APR XB, 1997, ADVISED THAT ON APR X,A 1997, ON ACFT I WORKED HAD A SLAT DISAGREE LIGHT. AFTER INVESTIGATION, #4 SLAT ADJUSTMENT BOLTS WERE NOT COTTER KEYED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE SLAT WAS INSTALLED PER THE MAINT MANUAL AND THE FIRST FLT AFTER INSTALLATION THE SLAT DISAGREE WARNING LIGHT WAS ILLUMINATED CONTINUOUSLY. DOWN-LINE STATION FOUND THE SLAT ADJUSTMENT BOLTS LOOSE AND NO COTTER PINS INSTALLED IN THE SLAT. THE RPTR STATES WHEN INSTALLING THE SLAT NO MISMATCH OCCURRED SO IT WAS NOT NECESSARY TO READJUST THE MAIN TRACK ADJUSTMENT BOLTS. THE MAINT MANUAL STATED THE BOLTS WERE ALREADY TORQUED AND THE COTTER PINS INSTALLED ON A SERVICEABLE SLAT. THE SHOP THAT OVERHAULED AND MADE THE SLAT SERVICEABLE HAD THE PRACTICE OF RELEASING THE SLAT FOR INSTALLATION WITH THE MAIN TRACK ADJUSTMENT BOLTS LOOSE AND THE COTTER PINS NOT INSTALLED. THE SHOP NOTED THIS DEV WITH A TAG ATTACHED TO THE SLAT. NO TAG WAS SEEN BY EITHER MECH OR THE PRESENCE OF THE TAG AND SLAT CONFIGN NOTED IN THE MAINT MANUAL. THE MISMATCHED SLAT WAS THE CAUSE OF THE SLAT DISAGREE WARNING LIGHT ON CONTINUOUSLY.

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.