LAX99LA304 · Glover TEENIE TWO
Glover TEENIE TWO · Accident: total loss of engine power (mechanical failure) on approach
From Chino Airport (CNO) to an unrecorded destination
Event
- NTSB case
- LAX99LA304
- 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
Glover TEENIE TWO
- Aircraft type
- Glover TEENIE TWO
- 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
- N925SG
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Chino Airport (CNO)To not recorded
- 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
- Approach · VFR pattern downwind
- 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)
- Also codedOther events the NTSB coded in the sequence, such as a wire strike after a loss of power. Flight Findings uses them for its kinds of event. Glossary
- Stall/spin
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Destroyed
Cause areas
- Fuel system, carburetor › Not safetied
- Fuel system, carburetor › Separation
- Owner/pilot mechanic › Maintenance, installation, improper
- Pilot in command › Airspeed, not maintained
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
While in the traffic pattern after takeoff, the engine lost power, the pilot lost control, and the airplane crashed. The airport control tower operator stated that the pilot radioed that he was unable to climb and wanted to return for landing. After clearing him to land, he observed the airplane entering a tight nose down spiral. The airplane remained in the spiral until it disappeared from his view. The engine had been experiencing overheating and loss of power problems. The pilot had replaced the fixed jet in his single jet carburetor with an adjustable jet just before the accident. The FAA inspector who examined the wreckage noted that the jet was missing from the carburetor. The pilot's student pilot certificate did not show a solo endorsement for this make and model airplane.
Probable cause
The in-flight separation and loss of the carburetor fuel jet resulting from the pilot's improper installation of the component. Also causal was the pilot's failure to maintain an adequate airspeed margin following the loss of power, which resulted in an inadvertent stall and spiral.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record LAX99LA304
- Event ID
- 20001212X19806
- Case number
- LAX99LA304
- 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: local date, investigation status. Values present in the bulk record are kept.
- The date is the local date; the NTSB stores the UTC date 1999-09-12.
- API snapshot SHA-256: 3920a20d1056909bd354c44e128e8a3a55996a162b4ef112d024ba5a4831f80d; retrieved 2026-09-21T20:23:37.601Z.