# NTSB Accident FTW89FA093
> **MBB BO-105S** · 1989-05-07 · W CAMERON BLK · FATL
## Event
- **NTSB number:** FTW89FA093
- **Event ID:** 20001213X28316
- **Type:** Accident
- **Date:** 1989-05-07
- **Location:** W CAMERON BLK
## Injuries
- **Highest injury:** FATL
- **Fatal:** 1
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 1
## Aircraft
- **Make:** MBB
- **Model:** BO-105S
- **Registration:** N2785B
- **FAR Part:** 135
- **Engines:** 2
- **Damage:** DEST
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

THE PARTIAL ELECTRICAL FAILURE OF THE MICRO-SWITCH FOR THE OUTBOARD LATERAL GUIDE ASSEMBLY, AND THE INCORRECT GUARD INSTALLED ON THE HYDRAULIC TEST SWITCH, RESULTING IN A TOTAL HYDRAULIC FAILURE. FACTORS WERE: THE INCORRECT INSTALLATION OF THE GUARD BY AN UNKNOWN PERSON, THE FAILURE OF THE COMPANY TO COMPLY WITH THE SPECIFIED SERVICE BULLETIN.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=FTW89FA093) · AI Analytics · CC0 1.0*