# NTSB Incident ENG13IA033
> **BOEING 777** · 2013-07-02 · Ugolny Airport, RS · —
## Event
- **NTSB number:** ENG13IA033
- **Event ID:** 20130715X90030
- **Type:** Incident
- **Date:** 2013-07-02
- **Location:** Ugolny Airport, RS
- **Coordinates:** 60.071109, -178.67611
## Injuries
- **Highest injury:** —
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 0
## Aircraft
- **Make:** BOEING
- **Model:** 777
- **Registration:** HL8275
- **FAR Part:** 129
- **Engines:** 2
- **Damage:** —
## Conditions
- **Light:** NR
- **Weather:** Unk
## Probable cause

The failure of the transfer gearbox resulting from the fracture and separation of the radial gearshaft from fatigue cracking as a result of a combination of high residual tensile stresses produced by local decarburization during the manufacturing process coupled with the normal operating stresses.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ENG13IA033) · AI Analytics · CC0 1.0*