ERA21LA197 · Cessna 402C
Hyannis Air Service Cessna 402C · Accident: birdstrike en route
From Nantucket Memorial Airport (ACK) to New Bedford Regional Airport (EWB)
Event
- NTSB case
- ERA21LA197
- 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
- Event fatalities
- Unknown
- 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
- Visual Meteorological Cond
Cessna 402C
- Aircraft type
- Cessna 402
- 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
- N36911
- Operator
- Hyannis Air Service
- Onboard fatalities
- Unknown
- Route
- From Nantucket Memorial Airport (ACK), Nantucket, MATo New Bedford Regional Airport (EWB), New Bedford, MA
- Aircraft age
- About 41 years (built 1980)
- 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 · descent
- 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
- Birdstrike
- 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
- Environmental issues › Physical environment
Approximate · Coordinates from the NTSB case API, which marks them as estimated or does not say; no uncertainty radius is established.
NTSB narrative
The pilot reported that during descent, about 5nm from the destination airport, he saw a bird flying from his left to right side. The bird went into a dive and struck the vertical stabilizer. The pilot did not observe any flight anomalies and continued to the destination airport without incident. Subsequent examination revealed substantial damage to the vertical stabilizer.
Probable cause
An inadvertent collision with a bird during descent, resulting in substantial damage to the vertical stabilizer.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record ERA21LA197
- Event ID
- 20210430103002
- Case number
- ERA21LA197
- 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, coordinates, 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: d1791ffd76819e515bf0a5397cbc6f81a72fa4d54d7088e07b9ee21d725b25c1; retrieved 2026-09-16T13:59:50.424Z.