ASN Wikibase Occurrence # 362647
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| Date: | Wednesday 25 November 1992 |
| Time: | 17:00 LT |
| Type: | Mason, Jack A. VELOCITY |
| Owner/operator: | Private |
| Registration: | N157JM |
| MSN: | DM099 |
| Engine model: | LYCOMING IO-360 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Crystal River, FL -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Louisville, KY (KLOU) |
| Sarasota, FL (KSRQ) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
DURING CRUISE FLT, APRX 17 INCHES OF ONE PROP BLADE SEPARATED. DURING THE EMERGENCY DESCENT FOR A FORCED LANDING, THE ACFT COLLIDED WITH TREES THEN THE WATER. EXAM OF THE PROP REVEALED THAT THE FWD HUB WHICH CONTACTS THE FWD MOUNTING FLANGE WAS BURNED. A PROP SPINNER WAS NOT INSTALLED. IT HAD BEEN REMOVED BEFORE THE PLT PURCHASED THE ACFT APRX 9 MONTHS EARLIER. THE PROP SPINNER BACKING PLATE WHICH IS .125 INCH THICK ATTACHES BETWEEN THE FWD MOUNTING FLANGE AND THE FWD HUB OF THE PROP. THE CORRECT PROCEDURE TO DETERMINE IF THE ATTACH BOLTS ARE THE CORRECT LENGTH IS TO INSTALL THEM THROUGH THE AFT MOUNTING FLANGE & THE PROPELLER BACKING PLATE (IF INSTALLED), THEN SCREW THEM INTO THE FWD MOUNTING FLANGE UNTIL THE BOLTS BOTTOM OUT. THE WIDTH BETWEEN THE TWO FLANGES (IF A PROP SPINNER IS NOT INSTALLED) SHOULD BE MEASURED, THEN THE WIDTH OF THE PROP HUB SHOULD BE MEASURED. THE WIDTH OF THE PROP HUB SHOULD BE GREATER THAN THE WIDTH BETWEEN THE FLANGES TO ALLOW FOR COMPRESSION OF THE HUB WHEN THE BOLTS ARE PROPERLY TORQUED.
Probable Cause: FAILURE OF AN UNKNOWN INDIVIDUAL TO DETERMINE THAT THE PROPELLER WAS PROPERLY SECURED AFTER REMOVAL OF THE PROPELLER SPINNER, RESULTING IN SEPARATION OF ONE OF THE PROPELLER BLADES DURING CRUISE FLIGHT. CONTRIBUTING TO THE ACCIDENT WAS UNSUITABLE TERRAIN ENCOUNTERED DURING THE FORCED LANDING.
Accident investigation:
 |
|
Sources:
NTSB MIA93LA022
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 18-Mar-2024 08:51 | ASN Update Bot | Added |
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