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A PA23-250 on final approach and landing had 3 green landing gear indications. On rollout; the left main gear folded aft. Caused by a broken drag link bolt.
| Attributes | |
| ACN | 645260 |
| Time | |
| Date | 200501 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | PA-32 Cherokee Six/Lance/Saratoga |
| Operating Under FAR Part | Part 121 |
| Flight Phase | landing : roll ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : single pilot |
| Qualification | pilot : cfi pilot : multi engine pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 242.5 flight time total : 2268.7 |
| ASRS Report | 645260 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : local |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure non adherence : far |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | performance deficiency : inspection performance deficiency : scheduled maintenance |
| Supplementary | |
| Problem Areas | Aircraft Chart Or Publication Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
Upon normal landing on rollout 1000 ft down runway; I heard a popping noise and left side of aircraft started sinking. I pulled the left mixture as soon as this happened; and the aircraft started pulling to the left more and more as the gear folded back. Recovered a drag link bolt on the runway. The bolt was covered in grease and dirt about 3/4 of the way through; with about 1/4 of new freshly broken metals indicating that it had a crack in it for some time. I feel that due to the apparent length of time that the bolt was 3/4 broken. That closer inspection at annual/100 hour could have possibly prevented this part from being still installed on the aircraft and this wouldn't have happened.
Original NASA ASRS Text
Title: A PA23-250 ON FINAL APCH AND LNDG HAD 3 GREEN LNDG GEAR INDICATIONS. ON ROLLOUT; THE L MAIN GEAR FOLDED AFT. CAUSED BY A BROKEN DRAG LINK BOLT.
Narrative: UPON NORMAL LNDG ON ROLLOUT 1000 FT DOWN RWY; I HEARD A POPPING NOISE AND L SIDE OF ACFT STARTED SINKING. I PULLED THE L MIXTURE AS SOON AS THIS HAPPENED; AND THE ACFT STARTED PULLING TO THE L MORE AND MORE AS THE GEAR FOLDED BACK. RECOVERED A DRAG LINK BOLT ON THE RWY. THE BOLT WAS COVERED IN GREASE AND DIRT ABOUT 3/4 OF THE WAY THROUGH; WITH ABOUT 1/4 OF NEW FRESHLY BROKEN METALS INDICATING THAT IT HAD A CRACK IN IT FOR SOME TIME. I FEEL THAT DUE TO THE APPARENT LENGTH OF TIME THAT THE BOLT WAS 3/4 BROKEN. THAT CLOSER INSPECTION AT ANNUAL/100 HR COULD HAVE POSSIBLY PREVENTED THIS PART FROM BEING STILL INSTALLED ON THE ACFT AND THIS WOULDN'T HAVE HAPPENED.
Data retrieved from NASA's ASRS site as of January 2009 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.