ASN Wikibase Occurrence # 367536
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| Date: | Saturday 6 January 1990 |
| Time: | 18:02 LT |
| Type: |  Mooney M20B |
| Owner/operator: | Private |
| Registration: | N74520 |
| MSN: | 1907 |
| Engine model: | LYCOMING O-360-A1D |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Santa Ana, CA -
 United States of America
|
| Phase: | Approach |
| Nature: | Private |
| Departure airport: | (KSNA) |
| (KSNA) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE ENGINE ON A MOONEY M20B FAILED WHILE ON SHORT FINAL APPROACH. EXAMINATION REVEALED THAT THE BOLTS RETAINING THE IDLER SHAFT HAD SHEARED ALLOWING A CHANGE IN THE INTERNAL TIMING AND FAILURE TO DRIVE THE LEFT MAGNETO. BOTH BOLT HEADS, THE LOCKPLATE, AND THE COTTER KEYS WERE FOUND IN THE OIL SUMP. THE IGNITION SPRINGS ON THE ELECTRICAL HARNESS HAD EVIDENCE OF ARCING.
Probable Cause: THE FAILURE OF BOLTS RETAINING THE IDLER SHAFT ALLOWING THE CAM SHIFT TIMING TO CHANGE AND BY ITS FAILURE TO DRIVE THE LEFT MAGNETO.
Accident investigation:
 |
|
Sources:
NTSB LAX90LA066
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 22-Mar-2024 15:32 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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