ASN Wikibase Occurrence # 245917
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| Date: | Monday 21 December 2020 |
| Time: | 16:25 LT |
| Type: |  North American Navion A |
| Owner/operator: | Private |
| Registration: | N4106K |
| MSN: | NAV-4-1106 |
| Total airframe hrs: | 5277 hours |
| Engine model: | Continental IO-520-BB3B |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Livermore Municipal Airport (LVK/KLVK), Livermore, CA -
 United States of America
|
| Phase: | Landing |
| Nature: | Test |
| Departure airport: | Livermore, CA |
| Livermore, CA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The airplane had an annual inspection and new wingtip fuel tanks installed about 6 months before the accident. The accident flight was the first flight since the maintenance. The pilot completed a normal runup inspection and the engine developed full power during takeoff. However, at an altitude of approximately 500 ft above ground level (agl), as the pilot turned onto the crosswind leg of the traffic pattern, the engine began to surge and lose power. As the pilot reduced the power for landing on the downwind leg, the engine lost total power. When the pilot realized the airplane would not make it to the runway, he prepared for a landing on the grass area parallel to the runway. The airplane touched down and the left wing impacted concrete blocks.
A postaccident examination of the engine revealed a leaking gascolator fuel inlet line caused by a loose hose clamp connection on the fuel line from the fuel selector to the gascolator. The loose connection allowed a large amount of air to be introduced into the fuel line going to the engine and fuel pumps, which caused the engine to surge and eventually lose power.
The examination also revealed several maintenance discrepancies. The leaking fuel inlet line was made of rubber instead of aluminum tubing, and the fuel selector's connection was improper. Additionally, the wingtip fuel tank installation revealed several inconsistencies with the installation, such as loose clamps and improper hardware installed. These discrepancies were an indication of improper recent maintenance.
Probable Cause: The improper installation of the gascolator fuel inlet line and hose clamp connection, which resulted in the total loss of engine power.
Accident investigation:
 |
|
Sources:
NTSB WPR21LA072
FAA register: https://registry.faa.gov/aircraftinquiry/Search/NNumberResult
https://flightaware.com/live/flight/N4106K
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 22-Dec-2020 16:49 | Geno | Added |
| 07-Apr-2021 19:36 | dvied | Updated [Narrative] |
| 21-Jun-2021 15:27 | Anon. | Updated [Aircraft type] |
| 09-Sep-2022 13:32 | ASN Update Bot | Updated [Time, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
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