# NTSB Incident ENG16IA001
> **BOEING 747** · 2015-10-02 · Russian airspace, JA · NONE
## Event
- **NTSB number:** ENG16IA001
- **Event ID:** 20151005X35533
- **Type:** Incident
- **Date:** 2015-10-02
- **Location:** Russian airspace, JA
- **Coordinates:** 55.216388, 160.109725
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 367
- **Total aboard:** 367
## Aircraft
- **Make:** BOEING
- **Model:** 747
- **Registration:** N662US
- **FAR Part:** 121
- **Engines:** 4
- **Damage:** MINR
## Conditions
- **Light:** NR
- **Weather:** Unk
## Probable cause

The PW4056 engine experienced an in-flight loss of power because of damage to the low-pressure turbine (LPT) because of the inadequate overhaul inspection and repair instructions that existed at the time of the LPT module's last overhaul.  A vane hook in the LPT case wore to the point to allow a 3rd stage turbine vane cluster to disengage and eventually fall into the path of the 3rd stage turbine blades causing extensive downstream damage to the LPT module.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ENG16IA001) · AI Analytics · CC0 1.0*