# NTSB Incident ENG11IA051
> **BOEING 757-222** · 2011-09-26 · Denver, CO, USA · NONE
## Event
- **NTSB number:** ENG11IA051
- **Event ID:** 20110927X91721
- **Type:** Incident
- **Date:** 2011-09-26
- **Location:** Denver, CO, USA
- **Coordinates:** 39.749824, -104.999977
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 185
- **Total aboard:** 185
## Aircraft
- **Make:** BOEING
- **Model:** 757-222
- **Registration:** N526UA
- **FAR Part:** 121
- **Engines:** 2
- **Damage:** MINR
## Conditions
- **Light:** —
- **Weather:** —
## Probable cause

**This probable cause was modified on 4/5/2012. Please see the public docket for this accident to view the original probable cause.**   The initial damage to the fan blades was caused by the ingestion of a Red-Tailed Hawk that caused one or more fan blades to fracture, striking the fan case and causing it to bulge. The initial fan blade fragment release impacted and damaged other passing fan blades generating various sized blades fragments. Some of these blade fragments were propelled forward of the fan case by passing fan blades and were reingested, creating a cascading effect of collateral impact damage to the other fan blades, the fan case, and the inlet cowl.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ENG11IA051) · AI Analytics · CC0 1.0*