ERA21LA247 · Garrison Ronald L ZODIAC 601 XL
Garrison Ronald L ZODIAC 601 XL · Accident on approach
Event
- NTSB case
- ERA21LA247
- 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
Garrison Ronald L ZODIAC 601 XL
- Aircraft type
- Garrison Ronald ZODIAC 601
- 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
- N315SV
- Operator
- Garrison Ronald L
- Onboard fatalities
- Unknown
- Route
- From not recordedTo not recorded
- Aircraft age
- About 9 years (built 2012)
- 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 base
- 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
- Miscellaneous/other
- 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
- Aircraft › Aircraft structures
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
Shortly after departure, the noncertificated pilot and builder of the experimental amateur-built airplane was flying at 1,000 ft mean sea level on the base leg of the airport traffic pattern when the right side of the cockpit canopy suddenly came loose and popped open. This was immediately followed by the left side of the canopy opening and then the entire canopy opened. The pilot stated this open canopy acted like a “giant air brake” and the airplane entered a descent that he was unable to arrest. The airplane descended into trees bordering the airport property, which resulted in substantial damage to the airframe. Postaccident examination of the right side canopy frame and latching mechanism found that although the latch did not show any irregularities or anomalous preimpact damage, the mechanism could easily be opened with slight finger pressure and no safeguard was present to keep the latch from opening prematurely. In addition, the several layers of foam weatherstripping installed along the frame of the canopy may have made it difficult for the latch to become properly seated during closure. Based on this information, it is likely that the latching mechanism was not completely secured prior to the flight or that the pilot inadvertently released the mechanism, with resulted in the canopy opening fully while in the airport traffic pattern, and the subsequent inability to sustain further flight.
Probable cause
An inadvertent release of the canopy, which allowing the canopy to open during flight and led to an inflight loss of airplane control. Contributing to the accident was the lack of any safeguard to prevent the inadvertent opening of the canopy.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record ERA21LA247
- Event ID
- 20210610103243
- Case number
- ERA21LA247
- 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, 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: 3f1003d4c3cd7c43770d13fda6b403d7b213da48286bb1f7844ca68b476ffa69; retrieved 2026-09-16T14:09:03.328Z.