Incident · 2023-09-21
What the record says
- Event date
- 2023-09-21
- Event type
- Incident
- Aircraft
- BELL 407 (N406TD)
- Operating rule
- UNK
- Operator
- Helicopter Flight Services, Inc. Operator named in NTSB report
- Operated by (per NTSB report)
- Helicopter Flight Services Inc.
Probable cause
The fracture of the upper-left tail boom attachment bolt due to abnormal loading of the bolt caused by a gap and misalignment between the upper-left longeron and the tail boom. Contributing to this incident was the lack of a check to verify the absence of gaps or misalignments at the conclusion of installation for the upper-left longeron.
Source: NTSB case ENG23LA045Flight crew
No flight-crew details recorded in the NTSB accident database for this event.
Facts as the NTSB records them — GroundCheck adds no judgement. Preliminary records may be revised as the investigation proceeds.