# NTSB Accident LAX04LA333
> **McDonnell Douglas MD 900** · 2004-09-08 · Mesa, AZ, USA · NONE
## Event
- **NTSB number:** LAX04LA333
- **Event ID:** 20041021X01675
- **Type:** Accident
- **Date:** 2004-09-08
- **Location:** Mesa, AZ, USA
- **Coordinates:** 33.473056, -111.726669
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 1
- **Total aboard:** 1
## Aircraft
- **Make:** McDonnell Douglas
- **Model:** MD 900
- **Registration:** N9016W
- **FAR Part:** 091
- **Engines:** 2
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

fracture of a Tension-Torsion strap in the anti-torque fan due to progressive fiber failure of the composite strap material from compression and/or transverse shear stresses that occurred with repeated manipulation of the cockpit anti-torque control pedals without the fan operating at full rpm.  A factor in the accident was the helicopter manufacturer's inadequate fatigue and load testing on the strap.

---
*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=LAX04LA333) · AI Analytics · CC0 1.0*