# NTSB Incident ENG06IA018
> **Boeing 767-223(ER)** · 2006-06-02 · Los Angeles, CA, USA · NONE
## Event
- **NTSB number:** ENG06IA018
- **Event ID:** 20060809X01126
- **Type:** Incident
- **Date:** 2006-06-02
- **Location:** Los Angeles, CA, USA
- **Coordinates:** 33.970813, -118.239608
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 3
- **Total aboard:** 3
## Aircraft
- **Make:** Boeing
- **Model:** 767-223(ER)
- **Registration:** N330AA
- **FAR Part:** UNK
- **Engines:** 2
- **Damage:** SUBS
## Conditions
- **Light:** —
- **Weather:** —
## Probable cause

The HPT stage 1 disk failed from an intergranular fatigue crack because of GE's inadequate design of the CF6-80 series HPT stage 1 disk.  The inadequate design of the disk resulted in a high stress area in the blade slot bottom aft corner that was at or nearly at the material's capability so that there was no damage tolerance such that a small dent could cause a crack to initiate and propagate to failure.  Contributing to the disk's failure was the FAA's failure to mandate an accelerated inspection schedule after a previous CF6-80A uncontained HPT stage 1 disk failure had occurred and after other CF6-80A HPT disks had been found during routine overhaul to have cracks in the blade slot bottom aft corners.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ENG06IA018) · AI Analytics · CC0 1.0*