# NTSB Accident BFO91LA055
> **BOEING 747-400** · 1991-06-16 · PHILADELPHIA, PA, USA · SERS
## Event
- **NTSB number:** BFO91LA055
- **Event ID:** 20001212X17180
- **Type:** Accident
- **Date:** 1991-06-16
- **Location:** PHILADELPHIA, PA, USA
- **Coordinates:** 39.889434, -75.230934
## Injuries
- **Highest injury:** SERS
- **Fatal:** 0
- **Serious:** 1
- **Minor:** 5
- **Uninjured:** 272
- **Total aboard:** 278
## Aircraft
- **Make:** BOEING
- **Model:** 747-400
- **Registration:** PHBFG
- **FAR Part:** 129
- **Engines:** 4
- **Damage:** —
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

FAILURE OF THE PILOT TO ENSURE CABIN CREW MEMBERS WERE PREPARED FOR AN ENCOUNTER WITH TURBULENCE.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=BFO91LA055) · MORVS · CC0 1.0*