# SDR 2000UALA00457

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 30, 2000
- Submitted: October 4, 2000
- Operation: Air carrier
- Aircraft: [N1859U](https://openairdocs.org/aircraft/N1859U), registered now
- Make and model: Doug DC-10-30
- Registry model: [Doug DC-10-30](https://openairdocs.org/model/mcdonnell-douglas-dc-10-30) (OpenAirDocs)
- Aircraft serial: 47819
- Aircraft time: 77,775 hours, 17,290 cycles
- Engine: Ge CF650C2
- System (JASC): [3232 · Landing Gear Door Actuator](https://openairdocs.org/jasc/3232)
- Part: Bolt
- Part number: AYG72571
- Condition: Failed
- Location: Mlg Door Act
- Stage of operation: LD
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2000UALA00457

## Discrepancy

REPORTED LOUD BANG WHEN LANDING GEAR EXTENDED.  ALL INDICATIONS NORMAL.  LANDING NORMAL.  AFTER BLOCKING OBSERVED LANDING GEAR DOORS DAMAGED.  *S/D*  THE CENTER GEAR RETRACT ACTUATOR LOWER BOLT (P/N: AYG7257-1) FAILED.  THE CENTER GEAR FREE-FELL AT EXTENSION, DAMAGING THE MECHANICALLY LINKED FORWARD DOORS.  THE BOLT, RETRACT ACTUATOR, AND GEAR LUG BUSHINGS WERE REPLACED.  INTENSIFIED VISUAL INSPECTION OF GEAR LINKS AND BRACES REVEALED NO ADDITIONAL DAMAGE.  A LARGE SECTION OF THE BOLT WAS RECOVERED.  FAILURE ANALYSIS REVEALED FATIGUE AS THE CAUSE.

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