# NTSB Incident ANC99IA025
> **Boeing 747-100** · 1999-01-19 · FAIRBANKS, AK, USA · NONE
## Event
- **NTSB number:** ANC99IA025
- **Event ID:** 20001204X00001
- **Type:** Incident
- **Date:** 1999-01-19
- **Location:** FAIRBANKS, AK, USA
- **Coordinates:** 64.900413, -148.160476
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 4
- **Total aboard:** 4
## Aircraft
- **Make:** Boeing
- **Model:** 747-100
- **Registration:** N481EV
- **FAR Part:** 121
- **Engines:** 4
- **Damage:** MINR
## Conditions
- **Light:** NDRK
- **Weather:** VMC
## Probable cause

The improper overhaul of the thrust reverser pneumatic drive unit, and the subsequent failure of the thrust reverser actuator.  Factors associated with the incident were the inadequate quality assurance procedures  by the overhaul company.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ANC99IA025) · AI Analytics · CC0 1.0*