CEN22LA098 · Cessna 172 G
Cessna 172 G · Accident: loss of engine power (total) on approach
Event
- NTSB case
- CEN22LA098
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Accident
- InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
- Completed
- API-reported fatalities
- 0 · all aircraft and ground
- Ground fatalities
- 0
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- General aviation
- WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
- Visual Meteorological Cond
Cessna 172 G
- Aircraft type
- Cessna 172
- Category
- Airplane
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- N3964L
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From not recordedTo not recorded
- Aircraft age
- About 56 years (built 1966)
- Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
- Part 91: General Aviation
- Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
- Approach · VFR pattern downwind
- Defining eventThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
- Loss of engine power (total)
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Substantial
Cause areas
- Aircraft › Aircraft power plant
- Not determined › Not determined
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
The pilot reported he departed with 7 gallons of automotive fuel in the right fuel tank and 5.8 gallons of automotive fuel gallons in the left fuel tank and that he checked the fuel levels with a sight gauge. The right fuel gauge indicated “one quarter of a tank” and the left fuel gauge indicated “slightly less than half a tank.” After the completion of the local flight, the pilot entered the downwind leg of the traffic pattern. At the midfield point, the pilot added 10° flaps and applied full carburetor heat. The engine then “stumbled and quit.” The pilot attempted to restart the engine to no avail. The pilot had the fuel tank selector in the BOTH position.
The pilot increased the flaps to 40° and executed a teardrop-style left turn to the runway. The airplane “floated long” and landed on airport property beyond the runway into trees, at stall speed. The airplane came to rest with the left wing pointing down toward the ground and the right wing toward the sky. The three occupants were able to egress from the airplane without further incident. The airplane sustained substantial damage to the left wing and fuselage.
Postaccident examination of the airplane found both fuel tanks intact, with no signs of a fuel leak on the airframe. About a quarter of a gallon of fuel was drained from the right fuel tank and about four gallons of fuel was drained from the left fuel tank. The fuel tank selector was found in the BOTH position. Airframe to engine control continuity was confirmed. An examination of the engine revealed no mechanical anomalies.
The reason for the loss of engine power could not be determined based on the available evidence. A review of the meteorological conditions near the time of the accident, showed that the formation of carburetor icing was not likely for the usage of aviation gasoline. However, the airplane was modified to use automotive gasoline, which the pilot used to fill the airplane with prior to the flight. References have stated that carburetor icing will occur in less time and at higher ambient temperatures with automotive gasoline than with aviation gasoline. Based on the available evidence, it could not be determined what, if any role, carburetor icing may have played in the accident.
Probable cause
A loss of engine power for reasons that could not be determined based on available information, which resulted in a forced landing.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record CEN22LA098
- Event ID
- 20220110104509
- Case number
- CEN22LA098
- Dataset
- full-current
- Source SHA-256
- 5cf380f0061817c0331a6b2d8cc7e0ee3a79bea469a1001dc5c10e56f35f5ab3
Source notes (4)
- Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
- Filled from the NTSB case API where the bulk record had no value: investigation status, cause areas. Values present in the bulk record are kept.
- The date is the local date, which is the same as the UTC date the NTSB stores.
- API snapshot SHA-256: 7757e0c01775c2edb09299cf64ad58799e5daabd006e1581bcba8100139238f6; retrieved 2026-09-16T14:52:51.550Z.