ASN Wikibase Occurrence # 354035
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| Date: | Monday 27 July 1998 |
| Time: | 10:50 LT |
| Type: |  Mooney M20C |
| Owner/operator: | Flight Training Center, Inc. |
| Registration: | N9744M |
| MSN: | 670038 |
| Engine model: | Lycoming O-360-A1D |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Vernon, TX -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Denver, CO (KFTG) |
| Denton, TX (KDTO) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The propeller blade separated during cruise flight and the aircraft started 'shaking violently.' The pilot pulled the mixture control to idle-cut-off and put the aircraft into a steep climb to stop the propeller. The pilot then diverted to an airport where he landed safely. The remainder of the blade was sent to the NTSB Materials Laboratory in Washington, D.C. A detailed examination of the fractured surface revealed crack arrest positions characteristic of fatigue cracking. Examination of the fatigue crack with a scanning electron microscope (SEM) revealed that corrosion pitting on the camber side of the blade was the origin of the fatigue crack. The propeller was last overhauled on November 16, 1989, and the last annual inspection was completed on January 1, 1998.
Probable Cause: Fatigue cracking of the propeller blade which originated from corrosion pitting on its camber side, resulting in the blade tip separation during cruise flight.
Accident investigation:
 |
|
Sources:
NTSB FTW99LA025
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 10-Mar-2024 18:20 | ASN Update Bot | Added |
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