Alon Aircoupe A2-A accident near Ciborro, Montemor-O-Novo, Pt, March 6, 2010
On March 6, 2010 at about 4:30 pm local time, a Alon Aircoupe A2-A, registered CSAIG, was destroyed in an accident during maneuvering near Ciborro, Montemor-O-Novo. It was a personal flight under non-U.S. private rules. 2 people were killed. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
This accident is under the jurisdiction and control of the Portuguese government.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- March 6, 2010 · about 4:30 pm local time
- Place
- Ciborro, Montemor-O-Novo, Portugal · map
- Type
- Accident
- Injuries
- 2 people were killed.
- Weather
- visual conditions (good weather)
- Aircraft
- Alon Aircoupe A2-A
- Registration
- CSAIG · no longer on the register · serial B-280
- Damage
- Destroyed
- Flight
- Personal flight · non-U.S. private rules
The NTSB's narrative final · quoted from the NTSB record
On March 6, 2010, at 1630 coordinated universal time, an Alon Aircoupe A2-A, Portuguese registered CS-AIG, was destroyed when it impacted terrain under unknown circumstances near Ciborro, Montemor-o-Novo, Portugal. Visual meteorological conditions prevailed at the time of the accident. The pilot and one passenger were fatally injured. The local flight originated from Ciborro, Montemor-o-Novo, Portugal. The Portuguese investigators reported that the airplane departed for a one hour local flight and when it did not return, a search was initiated. The wreckage was discovered north/northwest of the airport in a marshy field. The accident investigation is under the jurisdiction and control of the Portuguese government. This report is for informational purposes only and contains only information released by or obtained from the Portuguese government. Further information pertaining to this accident may be obtained from: Ministério das Obras Públicas, Transportes e Comunicações GPIAA - Gabinete de Prevenção e Investigação de Acidentes com Aeronaves Praca Duque de Saldanha 31-4º 1050-094 LISOBOA, Portugal
The complete narrative as the NTSB published it. The NTSB's docket holds the report as a PDF and any photographs, statements and other documents from the investigation.
The factual record from the NTSB's investigation tables, in plain English
What happened, in order
- Loss of control in flight during maneuvering defining event
The NTSB's findings
- cause Not determined › Not determined › (general) › (general) › Other authority investigated
Pilot
- Medical certificate: Unknown
- Seat: unk
- Injury: fatal
The aircraft
- Last inspection: inspection type not recorded
- Seats: 2
- Landing gear: fixed
The flight
- Departed from: Ciborro, Montemor-O-Novo
- Destination: Ciborro, Montemor-O-Novo
- Flight plan: not recorded
- Runway 31
Weather at the time
- Light: daylight
- Wind: from 210° at 7 knots
- Visibility: 6 statute miles
- Sky: scat at 2,000 ft
- Temperature: 63°F (17°C), dew point 55°F (13°C)
- Altimeter: 29.64 inHg
- Observation at 4:30 pm from LPPT, 50 miles away
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Flight crew | 1 | |||
| Passengers | 1 |
Documents from the investigation the NTSB's docket: the evidence folder behind the report
The docket, the folder of records gathered during an investigation (maintenance records, photographs, witness statements, examinations), has not been read from the NTSB for this case yet; the list appears here once it has. Open the docket at the NTSB.
Everything on this page comes from the NTSB's public records. The narrative, probable cause and findings are the NTSB's own words; the coded tables behind the report are written out in plain English, with pilots' ages, home towns and medical details left out. The documents and photographs are the NTSB's docket, shown as the NTSB released them. This site's own text never names anyone involved. A preliminary report can change; the final report usually follows one to two years later, and the page is refreshed when it does.