ASN Wikibase Occurrence # 226383
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| Date: | Thursday 20 June 2019 |
| Time: | 16:16 LT |
| Type: |  Cessna 172M Skyhawk |
| Owner/operator: | Private |
| Registration: | N64460 |
| MSN: | 17265247 |
| Year of manufacture: | 1974 |
| Total airframe hrs: | 2952 hours |
| Engine model: | Lycoming O-320 SERIES |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | near Fullerton Municipal Airport (FUL/KFUL), Buena Park, CA -
 United States of America
|
| Phase: | Initial climb |
| Nature: | Training |
| Departure airport: | Fullerton Municipal Airport, CA (FUL/KFUL) |
| Fullerton Municipal Airport, CA (FUL/KFUL) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
Shortly after takeoff during a practice go-around, the engine lost partial power. With limited time to troubleshoot, the flight instructor maneuvered the airplane for an off-airport landing, and the airplane sustained substantial damage after impacting a street.
Postaccident examination revealed that the aft section of the carburetor heat butterfly valve seal had detached and partially blocked the air inlet of the carburetor venturi. The obstruction reduced the amount of air available for combustion, resulting in a rich fuel-to-air mixture, and partial loss of power.
The valve seal was composed of a fiber-reinforced rubberized material that degraded and became brittle over the 45-year life of the airplane. The mechanic who performed the last inspection stated that he confirmed the operation and condition of the butterfly valve by observing it through both the airbox assembly forward inlet and the heated air inlet on the rear right side of the unit. He stated that the aft section of the seal is hard to view due to the way it folds behind the butterfly valve and that the only way to clearly see it is through the heated air inlet, which was small.
Probable Cause: Partial loss of engine power during takeoff due to an age-degraded carburetor heat valve seal, which detached and partially blocked the carburetor air inlet. Contributing to the accident was an inadequate maintenance inspection.
Accident investigation:
 |
|
Sources:
NTSB WPR19LA176
https://flightaware.com/resources/registration/N64460
Location
Media:
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 21-Jun-2019 10:11 | Iceman 29 | Added |
| 21-Jun-2019 10:51 | RobertMB | Updated [Aircraft type, Location, Departure airport, Destination airport, Source, Narrative] |
| 21-Jun-2019 13:05 | Geno | Updated [Source, Damage] |
| 02-Jul-2022 07:42 | ASN Update Bot | Updated [Time, Other fatalities, Source, Narrative, Category, Accident report] |
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