# NTSB Incident LAX01IA262
> **MDHI 520N** · 2001-07-25 · Los Angeles, CA, USA · NONE
## Event
- **NTSB number:** LAX01IA262
- **Event ID:** 20010803X01604
- **Type:** Incident
- **Date:** 2001-07-25
- **Location:** Los Angeles, CA, USA
- **Coordinates:** 33.95, -118.411109
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** MDHI
- **Model:** 520N
- **Registration:** N953SD
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** MINR
## Conditions
- **Light:** NITE
- **Weather:** VMC
## Probable cause

the excitation of the first bending mode natural frequency of the aft tube assembly that is installed through the rotating NOTAR fan drive system.  Contributing factors to the incident included the operator's maintenance practice of hand-sanding the pitch slider component of the NOTAR fan system.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=LAX01IA262) · AI Analytics · CC0 1.0*