# NTSB Incident CHI97IA117
> **Boeing 737-200** · 1997-04-28 · CHICAGO, IL, USA · MINR
## Event
- **NTSB number:** CHI97IA117
- **Event ID:** 20001208X07675
- **Type:** Incident
- **Date:** 1997-04-28
- **Location:** CHICAGO, IL, USA
## Injuries
- **Highest injury:** MINR
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 2
- **Uninjured:** 56
- **Total aboard:** 58
## Aircraft
- **Make:** Boeing
- **Model:** 737-200
- **Registration:** N9063U
- **FAR Part:** 121
- **Engines:** 2
- **Damage:** MINR
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

inadequate nickel plating was applied to the compressor disk during the rework process at the operator's overhaul facility, which resulted in a brittle fracture in the disk and an uncontained engine failure.  A factor was the operator's lack of written procedures and guidance for personnel on the NiCad plating line, along with their failure to supply a method of measuring the thickness of nickel applied.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CHI97IA117) · AI Analytics · CC0 1.0*