# NTSB Accident ANC20LA013
> **Piper PA31** · 2020-01-12 · Fairbanks, AK, USA · NONE
## Event
- **NTSB number:** ANC20LA013
- **Event ID:** 20200113X34716
- **Type:** Accident
- **Date:** 2020-01-12
- **Location:** Fairbanks, AK, USA
- **Coordinates:** 64.811668, -147.86972
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 9
- **Total aboard:** 9
## Aircraft
- **Make:** Piper
- **Model:** PA31
- **Registration:** N4112K
- **FAR Part:** 135
- **Engines:** 2
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The improper installation of a hydraulic line at the right main landing gear (MLG) unlock actuator, which resulted in a total loss of system hydraulic pressure and failure of the landing gear to extend. Contributing to the accident was the failure of the right MLG shuttle valve due to corrosion, which prevented the right MLG from extending during the emergency blowdown activation.

---
*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ANC20LA013) · AI Analytics · CC0 1.0*