ASN Wikibase Occurrence # 357620
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information.
If you feel this information is incomplete or incorrect, you can submit corrected information.
| Date: | Thursday 28 March 1996 |
| Time: | 08:16 LT |
| Type: |  Beechcraft 1900D |
| Owner/operator: | Mesa Airlines |
| Registration: | N29YV |
| MSN: | UE-29 |
| Year of manufacture: | 1992 |
| Total airframe hrs: | 8033 hours |
| Engine model: | P&W PT6A-67D |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | Jacksonville, FL -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Unknown |
| Departure airport: | (KJAX) |
| Orlando, FL (KMCO) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
Shortly after takeoff a counterweight and clamp separated from one propeller blade on the right propeller. The separated counterweight and clamp struck the adjacent blade and caused the blade to separate about 12 inches from the hub. The resultant imbalance caused severe vibration from the right engine. The propeller governor struck the engine cowling and broke into pieces. The flight crew shutdown the engine using the condition lever. The propeller did not feather when commanded by the flight crew, and it continued to windmill causing vibration and drag until landing. Metallurgical examination indicated a blade counterweight clamp screw failed causing the clamp to separate. The screw fracture surface initiated at the screw threads and had features typical of intergranular cracking. Cadmium, which is used as a plating on the screw after manufacturer, was present on the fracture surface.
Probable Cause: Failure of a blade counterweight clamp retaining screw due to cadmium embrittlement which occurred during the manufacture process. This resulted in the counterweight clamp separating and striking the adjacent blade causing it to separate.
Accident investigation:
 |
|
Sources:
NTSB MIA96IA109
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Mar-2024 19:54 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
The Aviation Safety Network is an exclusive service provided by:
Quick Links:
| ASN Home | Send Correction / Feedback |
| FSF Home | Disclaimer | Copyright |
| Contact Us | Privacy Policy |
| Press / Media |
CONNECT WITH US:
©2024 Flight Safety Foundation