ASN Wikibase Occurrence # 225095
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| Date: | Tuesday 14 May 2019 |
| Time: | 08:19 LT |
| Type: |  Chance Vought F4U-7 Corsair |
| Owner/operator: | BA 1945 LLC |
| Registration: | N965CV |
| MSN: | 965 |
| Year of manufacture: | 1952 |
| Engine model: | Pratt & Whitney R2800 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Jerome County Airport (KJER), Jerome, ID -
 United States of America
|
| Phase: | Take off |
| Nature: | Private |
| Departure airport: | Jerome County Airport, ID (KJER) |
| Rock Springs-Sweetwater County Airport, WY (RKS/KRKS) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
Following an annual inspection, the mechanic who conducted the inspection was unable to conduct a test flight due to weather conditions but did perform several engine runs, during which he adjusted the fuel enrichment setting. The mechanic told the pilot before the accident flight that he would have to lean the engine manually while on the ground instead of using the auto-lean mixture setting, as the engine would run rich.
Before taking off, the pilot placed the mixture in the auto-lean position. The engine sputtered, and the pilot saw black smoke originate from the exhaust. The pilot then manually leaned the engine, and 'it cleared up.' The pilot placed the mixture in the auto-rich position, performed a magneto check, then taxied onto the runway, but the engine 'loaded up' a second time. The pilot stated that he manually leaned the engine, then moved the mixture to the auto-rich position while he advanced the throttle to 30 inches of manifold pressure. He said that he held this power setting for about 1 minute before initiating the takeoff. As the airplane accelerated past about 100 to 110 knots, the engine 'coughed', and the pilot reduced power to idle and aborted the takeoff but 'ran out of runway.' The airplane exited the right side of the runway and impacted a dirt berm and fence before it came to rest upright.
Postaccident examination of the engine revealed no evidence of any mechanical malfunction that would have precluded normal operation and production of power, which included no evidence of preignition or detonation within each cylinder. During functional tests of the carburetor, it was found that, at high power settings, the fuel flow was lower than specified limits and would result in a lean fuel/air mixture. However, at lower power settings, the fuel/air mixture was within or slightly higher than specified limits. While it is likely that the lean fuel/air mixture at higher power settings could have resulted in detonation, no signatures were observed to suggest that it occurred.
The pilot stated that he wanted to get the airplane to an airshow and relied on the information provided to him by the mechanic. He reported that, in hindsight, he should have not flown the airplane and had the carburetor removed for overhaul.
Probable Cause: The pilot's decision to fly the airplane with a known mechanical deficiency.
Accident investigation:
 |
|
Sources:
NTSB WPR19LA157
FAA register: https://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=N965CV
Location
Media:
1 taken to hospital after small plane crashes at Jerome County Airport https://t.co/M107Zyong3
— Valerie (@m62valgmailcom) 15 mai 2019
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 14-May-2019 23:05 | Captain Adam | Added |
| 15-May-2019 00:49 | Geno | Updated [Time, Aircraft type, Registration, Cn, Operator, Location, Departure airport, Source] |
| 15-May-2019 08:54 | harro | Updated [Narrative] |
| 15-May-2019 18:59 | Iceman 29 | Updated [Source, Embed code] |
| 16-May-2019 19:43 | A.J.Scholten | Updated [Source, Embed code] |
| 02-Jul-2022 09:03 | ASN Update Bot | Updated [Time, Other fatalities, Nature, Destination airport, Source, Embed code, Narrative, Category, Accident report] |
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