# NTSB Incident ERA11IA320
> **ROBINSON HELICOPTER COMPANY R22 MARINER** · 2011-05-29 · Redding, CT, USA · NONE
## Event
- **NTSB number:** ERA11IA320
- **Event ID:** 20110601X42124
- **Type:** Incident
- **Date:** 2011-05-29
- **Location:** Redding, CT, USA
- **Coordinates:** 41.322776, -73.386947
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** ROBINSON HELICOPTER COMPANY
- **Model:** R22 MARINER
- **Registration:** N8313E
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** —
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The pilot's inadequate helicopter preflight inspection and the mechanic’s inadequate annual inspection, both of which failed to detect a worn bolt in the tail rotor teeter hinge prior to its fracture due to fatigue.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ERA11IA320) · AI Analytics · CC0 1.0*