# Incident 20210611008539I: Diamond Aircraft Ind Gmbh DA42MNG, Livermore, CA, June 11, 2021

- Type: FAA incident report (Accident/Incident Data System), as reported
- Date: June 11, 2021, 10:17 local time
- Place: Livermore, CA
- Airport: Livermore
- Damage: Minor damage
- Phase of flight: Takeoff: Departure Roll
- Operating rules: General operating rules (Part 91)
- Location: 37.6934° N, 121.8204° W: Placed by OpenAirDocs at LIVERMORE MUNI (LVK), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=37.6934&lon=-121.8204&mi=10
- Aircraft: N640SH, a cancelled registration (https://openairdocs.org/deregistered/N640SH-2025-12-24) (OpenAirDocs)
- Registry model: Diamond Aircraft Ind DA42MNG (registry code 2990009, https://openairdocs.org/model/diamond-aircraft-ind-da42mng) (OpenAirDocs)
- Registry engine: Austro E4 series (registry code 06400, https://openairdocs.org/engine/austro-e4-series) (OpenAirDocs)
- Reported make and model: DIAMOND AIRCRAFT IND GMBH DA42MNG
- Reported engine: AUSTRO E4 SERIES
- People aboard: 2
- Fatal injuries: 0
- Other injuries: 0
- Pilot certificates: Private pilot
- Pilot flight hours: 1,000 total, 400 in this make and model
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20210611008539I

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

PILOT DID NOT SECURE THE AFT PASSENGER DOOR PRIOR TO TAKEOFF.  THE PRIMARY DOOR LATCH WAS NOT SECURED AND THE SECONDARY "SAFETY" DOOR LATCH WAS STICKING AND NOT ENGAGING PROPERLY.THERE ARE  TWO SMALL CARBON FIBER TYPE HINGES MADE  SPECIFICALLY TO BREAK OFF AT LOW AIRSPEED. THUS MINIMIZING DAMAGE TO COMPOSITE STRUCTURE. THE DOOR CAME OPEN DURING TAKEOFF GROUND ROLL BREAKING THE TWO HINGE POINTS . THE DOOR FELL OFF ONTO RUNWAY. NO OTHER DAMAGE TO AIRFRAME OR TAIL WAS FOUND. DOOR OPEN WARNING SYSTEM WAS FOUND TO BE FUNCTIONING.

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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