# NTSB Accident CHI88FA110
> **BOEING 747-136** · 1988-05-09 · CHICAGO, IL, USA · NONE
## Event
- **NTSB number:** CHI88FA110
- **Event ID:** 20001213X25642
- **Type:** Accident
- **Date:** 1988-05-09
- **Location:** CHICAGO, IL, USA
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 304
- **Total aboard:** 304
## Aircraft
- **Make:** BOEING
- **Model:** 747-136
- **Registration:** GAWND
- **FAR Part:** 129
- **Engines:** 4
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

FAILURE OF THE NUMBER THREE FLAP TRACK DUE TO STRESS CORROSION CRACKING. FACTORS CONTRIBUTING TO THIS FAILURE ARE INSUFFICIENT DESIGN OF THE MEMBER AND INADEQUATE INSPECTION AND MAINTENANCE PROCEDURES TO DETECT CRACKS BEFORE THEY PROPAGATE TO A CRITICAL LENGTH.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CHI88FA110) · AI Analytics · CC0 1.0*