A DC9-30 in heavy check was found to have #4 slat drive track roller pin missing and nut loose. Replaced roller pin, torqued nut and installed cotter pin.

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Attributes
ACN	631580
Time
Date	200409
Day	Tue
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	DC-9 30
Operating Under FAR Part	Part 121
Flight Phase	ground : maintenance
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : powerplant technician : airframe
Experience	maintenance technician : 24
ASRS Report	631580
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure non adherence : far
Independent Detector	other other : 1
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : manuals performance deficiency : installation performance deficiency : inspection performance deficiency : repair
Supplementary
Problem Areas	Maintenance Human Performance Aircraft Chart Or Publication
Primary Problem	Maintenance Human Performance

Narrative:

Aircraft flew in with problem. Air carrier X sep/tue/04, in line check grease fitting on lower forward drive track #4 slat panel would not accept grease. Removed access panel on outboard side of track and found roller pin missing cotter pin and nut on last thread of pin. Corrective action: nut was installed, torqued and safetied with cotter pin. Nut could have eventually worked its way off threads, pin could have fallen out and bearing dislodged causing slat to damage wing.

Original NASA ASRS Text

Title: A DC9-30 IN HVY CHK WAS FOUND TO HAVE #4 SLAT DRIVE TRACK ROLLER PIN MISSING AND NUT LOOSE. REPLACED ROLLER PIN, TORQUED NUT AND INSTALLED COTTER PIN.

Narrative: ACFT FLEW IN WITH PROB. ACR X SEP/TUE/04, IN LINE CHK GREASE FITTING ON LOWER FORWARD DRIVE TRACK #4 SLAT PANEL WOULD NOT ACCEPT GREASE. REMOVED ACCESS PANEL ON OUTBOARD SIDE OF TRACK AND FOUND ROLLER PIN MISSING COTTER PIN AND NUT ON LAST THREAD OF PIN. CORRECTIVE ACTION: NUT WAS INSTALLED, TORQUED AND SAFETIED WITH COTTER PIN. NUT COULD HAVE EVENTUALLY WORKED ITS WAY OFF THREADS, PIN COULD HAVE FALLEN OUT AND BEARING DISLODGED CAUSING SLAT TO DAMAGE WING.

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.