# NTSB Accident DCA93MA033
> **BOEING 747-121** · 1993-03-31 · ANCHORAGE, AK, USA · NONE
## Event
- **NTSB number:** DCA93MA033
- **Event ID:** 20001211X11963
- **Type:** Accident
- **Date:** 1993-03-31
- **Location:** ANCHORAGE, AK, USA
- **Coordinates:** 61.159198, -149.990325
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 5
- **Total aboard:** 5
## Aircraft
- **Make:** BOEING
- **Model:** 747-121
- **Registration:** N473EV
- **FAR Part:** 129
- **Engines:** 4
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

THE LATERAL SEPARATION OF THE NO. 2 ENGINE PYLON DUE TO AN ENCOUNTER WITH SEVERE OR POSSIBLY EXTREME TURBULENCE THAT RESULTED IN DYNAMIC MULTI-AXIS LATERAL LOADINGS THAT EXCEEDED THE ULTIMATE LATERAL LOAD-CARRYING CAPABILITY OF THE PYLON, WHICH WAS ALREADY REDUCED BY THE PRESENCE OF THE FATIGUE CRACK NEAR THE FORWARD END OF THE PYLON'S FORWARD FIREWALL WEB.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=DCA93MA033) · MORVS · CC0 1.0*