# NTSB Incident ENG24LA014
> **BOEING 787** · 2024-05-14 · Singapore, OF, SN · NONE
## Event
- **NTSB number:** ENG24LA014
- **Event ID:** 20240515194260
- **Type:** Incident
- **Date:** 2024-05-14
- **Location:** Singapore, OF, SN
- **Coordinates:** 2.037942, 107.049743
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 210
- **Total aboard:** 210
## Aircraft
- **Make:** BOEING
- **Model:** 787
- **Registration:** N27957
- **FAR Part:** 121
- **Engines:** 2
- **Damage:** MINR
## Conditions
- **Light:** NITE
- **Weather:** VMC
## Probable cause

The uncontained left engine failure was caused by the failure and liberation of the HPT stage 1 aft blade retainer as a result of a fatigue crack in the upper collet radius that originated from a surface connected cluster of Oxide/Carbonitride/Nitride/Carbide (OCNC) particles.   Contributing to the failure of the HPT stage 1 aft blade retainer was an unknown material behavior unique to OCNC clusters in Rene 65 material that are surface connected in highly stressed material that may result in a localized reduction of material fatigue life capability.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ENG24LA014) · AI Analytics · CC0 1.0*