# NTSB Accident ANC99LA099
> **Boeing 747-269B** · 1999-07-29 · ANCHORAGE, AK, USA · NONE
## Event
- **NTSB number:** ANC99LA099
- **Event ID:** 20001212X19142
- **Type:** Accident
- **Date:** 1999-07-29
- **Location:** ANCHORAGE, AK, USA
- **Coordinates:** 61.159626, -149.990966
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 5
- **Total aboard:** 5
## Aircraft
- **Make:** Boeing
- **Model:** 747-269B
- **Registration:** N707CK
- **FAR Part:** 121
- **Engines:** 4
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The failure of a turbine blade, and subsequent penetration of the shroud (containment ring).  A factor associated with the accident was the FAA's insufficient design standards/requirements addressed in an FAA Air Worthiness Directive, which called for a strengthened containment ring.  The failed containment ring was in compliance with the Air Worthiness Directive.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ANC99LA099) · AI Analytics · CC0 1.0*