# NTSB Accident DCA23FA417
> **BOEING 737-890** · 2023-08-21 · Santa Ana, CA, USA · NONE
## Event
- **NTSB number:** DCA23FA417
- **Event ID:** 20230821192903
- **Type:** Accident
- **Date:** 2023-08-21
- **Location:** Santa Ana, CA, USA
- **Coordinates:** 33.675701, -117.86799
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 112
- **Total aboard:** 112
## Aircraft
- **Make:** BOEING
- **Model:** 737-890
- **Registration:** N516AS
- **FAR Part:** 121
- **Engines:** 2
- **Damage:** SUBS
## Conditions
- **Light:** NITE
- **Weather:** IMC
## Probable cause

Maintenance personnel’s excessive grinding of the left main landing gear’s aft trunnion pin during machining, which imparted heat damage to the base metal and led to the fatigue cracking that caused the pin to fracture during landing.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=DCA23FA417) · AI Analytics · CC0 1.0*