# NTSB Accident LAX90FA061
> **BOEING 737-204** · 1989-12-31 · TUCSON, AZ, USA · MINR
## Event
- **NTSB number:** LAX90FA061
- **Event ID:** 20001213X29969
- **Type:** Accident
- **Date:** 1989-12-31
- **Location:** TUCSON, AZ, USA
- **Coordinates:** 32.150516, -110.929687
## Injuries
- **Highest injury:** MINR
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 10
- **Uninjured:** 123
- **Total aboard:** 133
## Aircraft
- **Make:** BOEING
- **Model:** 737-204
- **Registration:** N198AW
- **FAR Part:** 121
- **Engines:** 2
- **Damage:** SUBS
## Conditions
- **Light:** NDRK
- **Weather:** VMC
## Probable cause

FAILURE OF THE OPERATOR'S MAINTENANCE PERSONNEL TO DETECT AN ELECTRICAL WIRE WHICH HAD CHAFED AGAINST A HYDRAULIC LINE AND WHICH EVENTUALLY ARCED CAUSING A LEAK IN THE HYDRAULIC LINE AND SUBSEQUENT FIRE AND HYDRAULIC SYSTEM FAILURE. IN ADDITION, PREVIOUS WEAR OF CHECK VALVES IN THE BACKUP HYDRAULIC SYSTEMS PREVENTED THE AIRPLANE FROM STOPPING ON THE RUNWAY. A CONTRIBUTING FACTOR WAS THE AIRPLANE MANUFACTURER'S INADEQUATE GUIDANCE FOR MAINTAINING THE HYDRAULIC COMPONENTS.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=LAX90FA061) · AI Analytics · CC0 1.0*