ASN Wikibase Occurrence # 185332
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| Date: | Thursday 10 March 2016 |
| Time: | 15:33 |
| Type: |  Lancair ES |
| Owner/operator: | Private |
| Registration: | N44AZ |
| MSN: | ES-089-FB |
| Year of manufacture: | 2003 |
| Total airframe hrs: | 245 hours |
| Engine model: | Mazda/Atkins 20B |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Ernest A Love Field Airport (KPRC), Prescott, AZ -
 United States of America
|
| Phase: | Take off |
| Nature: | Private |
| Departure airport: | Prescott, AZ (PRC) |
| Prescott, AZ (PRC) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The airline transport pilot was departing in the experimental, amateur-built airplane. During the initial climb, the engine experienced a partial loss of power. The pilot performed a precautionary landing on a taxiway, during which the airplane departed the paved surface and the nose landing gear collapsed.
Postaccident examination of the engine turbocharger revealed reddish-white discoloration of the turbine wheel, which suggested excessive engine exhaust gas temperature. Likewise, discoloration observed on the turbine end shaft journal was consistent with high temperature. The combination of high exhaust temperature and the rotational speed of the turbine wheel likely caused the blade material to creep and the wheel diameter to increase until the blade tips rubbed against the turbine housing. This eventually caused blade tip failures, which resulted in a rotating imbalance. It is likely that the combination of wheel rubbing and imbalance and caused the turbocharger to slow or stop, which in turn resulted in the loss of engine power. The reason for the excessive engine temperature could not be determined during the investigation based on the available information.
Probable Cause: A partial loss of engine power due to an over-temperature event, which thermally damaged the blade tips of the turbocharger wheel and resulted in a slowing or stoppage in the rotation of the turbocharger.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 12-Mar-2016 05:55 | Geno | Added |
| 21-Dec-2016 19:30 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 19-Aug-2017 15:08 | ASN Update Bot | Updated [Time, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative] |
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