ASN Wikibase Occurrence # 362013
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| Date: | Tuesday 25 May 1993 |
| Time: | 11:15 LT |
| Type: | US-LTA 138S |
| Owner/operator: | Us-lta Corp |
| Registration: | N832US |
| MSN: | 002 |
| Total airframe hrs: | 30 hours |
| Engine model: | Lycoming IO-540-K2A5 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | Santa Maria, CA -
 United States of America
|
| Phase: | En route |
| Nature: | Ferry/positioning |
| Departure airport: | Paso Robles, CA (KPRB) |
| Chino, CA (KCNO) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE AIRSHIP EXPERIENCE A FRACTURED ROD END BEARING DURING CRUISE FLIGHT. AN ONBOARD MECHANIC WAS ABLE TO MANUALLY MANIPULATE THE CONTROLS UNTIL THE PILOT MADE A PRECAUTIONARY LANDING. EXAMINATION OF THE ROD END BEARING REVEALED FATIGUE CRACKS IN THE THREADS AT THE FRACTURE. EXAMINATION OF THE THREADS DISCLOSED THEY WERE NOT ROLLED AFTER THE MACHINING PROCESS. THE MANUFACTURER'S SPECIFICATIONS DID NOT SPECIFY ROLLING IN THE THREADED AREAS. THE MANUFACTURER INDICATED THE BEARING MAY HAVE BEEN BINDING AS A RESULT OF TEFLON IN THE BEARING AREA ADHERING TO THE METAL SURFACE CONTRIBUTING TO THE STRESSES THAT MAY HAVE FATIGUED THE ROD END BEARING.
Probable Cause: INADEQUATE SPECIFICATIONS IN THE DESIGN AND MANUFACTURE OF A RUDDER CONTROL TUBE ROD END BEARING BY THE AIRSHIP MANUFACTURER.
Accident investigation:
 |
|
Sources:
NTSB LAX93IA235
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 17-Mar-2024 16:49 | ASN Update Bot | Added |
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