# NTSB Incident CHI98IA136
> **Robinson R22 BETA** · 1998-04-27 · FRANKLIN, WI, USA · NONE
## Event
- **NTSB number:** CHI98IA136
- **Event ID:** 20001211X09809
- **Type:** Incident
- **Date:** 1998-04-27
- **Location:** FRANKLIN, WI, USA
- **Coordinates:** 42.880786, -88.000823
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** Robinson
- **Model:** R22 BETA
- **Registration:** N8331F
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** MINR
## Conditions
- **Light:** DAWN
- **Weather:** VMC
## Probable cause

The mechanic's failure to follow the manufacturer's maintenance rebuilding instructions.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CHI98IA136) · AI Analytics · CC0 1.0*