ASN Wikibase Occurrence # 297777
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: | Tuesday 3 September 2019 |
| Time: | 09:00 LT |
| Type: |  Velocity |
| Owner/operator: | |
| Registration: | N2XF |
| MSN: | 3RX029 |
| Year of manufacture: | 2008 |
| Total airframe hrs: | 1420 hours |
| Engine model: | Continental TSIO-550-C |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Mack, Colorado -
 United States of America
|
| Phase: | En route |
| Nature: | Executive |
| Departure airport: | Grand Junction-Walker Field, CO (GJT/KGJT) |
| Mack, CO (10CO) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The commercial pilot departed on a business flight in the experimental airplane in visual meteorological conditions. As the airplane was passing 15,000 ft en route to its assigned cruising altitude of 18,000 ft, the propeller started to overspeed. The pilot reduced the propeller rpm and manifold pressure but reported that he was unable to find a power setting that would allow the airplane to maintain level flight. Air traffic control provided the pilot with vectors to a nearby airport, where the pilot performed a power-off approach and waited until the landing was assured before lowering the landing gear. The airplane touched down halfway down the runway. The main landing gear was not completely extended, rendering the brakes inoperable, and during the landing roll, the airplane impacted an irrigation pipe, slid off the departure end of the runway, and came rest in a field.
Postaccident examination revealed no discrepancies with the propeller or governor. The screws securing the electronic ignition timing ring to the three brackets bolted to the crankshaft at the propeller stud flange had failed, damaging the timing disk and sensors. The damage caused by the loose screws caused the engine to slow from about 2,700 rpm to about 2,550 rpm. The propeller governor then decreased the propeller pitch to bring the propeller rotation back up to speed, but once the obstruction of the ingested screws cleared and the friction was released, the low-pitch blades allowed the propeller to overspeed. Thus, the overspeed was likely caused by the propeller governor's reaction to a slight slow down of engine speed when the timing ring attachment screws backed out and damaged the electronic ignition timing sensors.
Probable Cause: A propeller overspeed due to failure of the electronic ignition timing ring attachment screws, and a runway overrun during the subsequent forced landing.
Accident investigation:
 |
|
Sources:
NTSB CEN19LA313
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 15-Oct-2022 08:27 | ASN Update Bot | Added |
| 01-Aug-2023 21:20 | harro | Updated |
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