CEN09FA195 · Grumman American AVN. CORP. AA-1B
Grumman American AVN. CORP. AA-1B · Accident: VFR encounter with IMC en route
From Sandia Airpark Estates East Airport (1n1) to Los Alamos Airport (KLAM)
Event
- NTSB case
- CEN09FA195
- 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
- 2 · all aircraft and ground
- Ground fatalities
- Unknown
- 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
- Instrument Meteorological Cond
Grumman American AVN. CORP. AA-1B
- Aircraft type
- Grumman American AA-1
- 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
- N9646L
- Operator
- Rupert Randal N
- Onboard fatalities
- Unknown
- Route
- From Sandia Airpark Estates East Airport (1n1)To Los Alamos Airport (KLAM), Los Alamos Airp, NM
- 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
- En route
- 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
- VFR encounter with IMC
- 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
- Aircraft › Aircraft oper/perf/capability
- Environmental issues › Conditions/weather/phenomena
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
The non-instrument-rated private pilot and passenger were commuting to work in the dark, following a familiar route of flight. The airplane was not equipped to fly in instrument weather conditions and there was no evidence found indicating the pilot had obtained a weather briefing or filed a flight plan. One witness described light rain falling at the departure airfield 30 minutes before the airplane departed. A second witness, who was driving along the airplane's intended route of flight, saw the airplane depart the airfield and described the weather deteriorating from light rain to snow as she drove towards the accident site. She indicated that heavy snow was falling when she saw the accident site and notified authorities. Ethanol was detected in a postmortem urine specimen (at 0.191 mg/dL), and in two separate postmortem blood specimens from the pilot (at 0.075 and 0.092 mg/dL), consistent with impairment from the effects of alcohol at the time of the accident. No witnesses to the pilot’s behavior the night prior to the accident could be found.
Probable cause
The pilot's continued visual flight into instrument meteorological conditions. Contributing to the accident were the pilot's recent usage of alcohol and his subsequent impairment.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record CEN09FA195
- Event ID
- 20090309X20142
- Case number
- CEN09FA195
- 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. 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: a51460266c2f953be7bbce8cb3002d198b16898c332dacae42db0c4924e200ef; retrieved 2026-09-13T19:59:02.226Z.