# NTSB Accident WPR21LA208
> **BOEING A75N1(PT17)** · 2021-05-26 · Hollister, CA, USA · MINR
## Event
- **NTSB number:** WPR21LA208
- **Event ID:** 20210527103156
- **Type:** Accident
- **Date:** 2021-05-26
- **Location:** Hollister, CA, USA
- **Coordinates:** 36.955489, -121.46791
## Injuries
- **Highest injury:** MINR
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 2
- **Uninjured:** 0
- **Total aboard:** 2
## Aircraft
- **Make:** BOEING
- **Model:** A75N1(PT17)
- **Registration:** N75016
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The improper installation of a relief valve spring that was shorter than the standard spring length, which slowed the response of the propeller governor to change the pitch of the blades during climbout, resulting in a partial loss of power.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=WPR21LA208) · AI Analytics · CC0 1.0*