ASN Wikibase Occurrence # 284743
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| Date: | Monday 18 June 2007 |
| Time: | 19:15 LT |
| Type: | Harpster Hawk Aero Tandem |
| Owner/operator: | Private |
| Registration: | N4022P |
| MSN: | H1143-A-TRI-2706 |
| Total airframe hrs: | 188 hours |
| Engine model: | Hirth 2706 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Southern Pines, North Carolina -
 United States of America
|
| Phase: | Unknown |
| Nature: | Private |
| Departure airport: | Southern Pines-Pinehurst Airport, NC (SOP/KSOP) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The experimental amateur-built Hawk Aero Tandem airplane sustained substantial damage during an emergency landing following a loss of engine power during cruise. The pilot stated that he had lost engine power after restarting the engine twice. He impacted a mound with his nose landing gear. A witness saw liquid in the fuel tank when the airplane was disassembled. The airplane was powered by a Hirth 2706 fuel-injected engine. The Blue Max two cycle oil's recommended fuel and oil ratio was 100:1. An engine manual supplement noted that the recommended fuel and oil mixture was 90:1 for fuel injected engines. The pilot reported that he used a 100:1 fuel/oil ratio. A representative of the engine repair facility stated, "This engine experienced a piston seizure of the mag[neto] end piston. ... The PTO side piston is undamaged and from inspection of this cylinder it appears that possibly there was too lean of an oil mix in the fuel."
Probable Cause: The loss of engine power during cruise due to the piston seizure for undetermined reasons and the unsuitable terrain the pilot encountered during the forced landing. A factor was the rising terrain of the mound that the airplane impacted.
Accident investigation:
 |
|
Sources:
NTSB CHI07LA205
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 01-Oct-2022 06:56 | ASN Update Bot | Added |
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