LAX98FA119 · Beech A35
Beech A35 · Accident: total loss of engine power (mechanical failure) during initial climb
From Auburn Municipal Airport (AUN) to Byron Airport (C83)
Event
- NTSB case
- LAX98FA119
- 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
Beech A35
- Aircraft type
- Beechcraft 35
- 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
- N8597A
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Auburn Municipal Airport (AUN), CATo Byron Airport (C83), Byron, CA
- Aircraft age
- Not recorded
- 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
- Initial climb
- First occurrenceThe 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
- Total loss of engine power (mechanical failure)
- 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
- Fuel system, pump › Failure, total
- Pilot in command › Emergency procedure, not performed
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
The airplane's engine lost power during the initial climb after departure, and the pilot performed a 180-degree turn back towards the airport, but landed short of the runway. The airplane was equipped with a hand operated emergency fuel pump, which was part of the fuel selector valve. The emergency procedures section of the POH states that the emergency hand pump should be used to restore fuel pressure in the event of an engine driven pump failure. The pilot stated that he never attempted to use the emergency hand fuel pump. An on-scene examination revealed fuel in both main tanks. Examination of the engine driven Lear-Romec fuel pump coupling found it had sheared and separated. Internal examination of the pump revealed bluing of the steel pump vane tips and galling of the pump liner. According to the manufacturer, the pump at some time had been operated without fuel, which cools the vanes, and had overheated. Metallurgical examination of the failed fuel pump coupling revealed that it separated due to ductile torsional overstress at a designed location. According to records available, the pump had accumulated about 619 hours since overhaul with an unknown total time.
Probable cause
failure of the engine driven fuel pump drive coupling and the pilot's failure to perform the emergency procedure specified in the Pilot Operating Handbook.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record LAX98FA119
- Event ID
- 20001211X09701
- Case number
- LAX98FA119
- Dataset
- historical-pre2008
- Source SHA-256
- 89e2df6d848e7ab3b42e7d7c7a03ff403303057a26ca04c95b3ea67201c3ce74
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. 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: e3cc5c9b3071d69cb9894c2c815dbd674ebc648456823edb064e3a0394a91b9b; retrieved 2026-09-21T20:53:22.922Z.