# NTSB Incident ENG08IA051
> **BOEING 737** · 2008-06-27 · Phoenix (PHX), AZ, USA · NONE
## Event
- **NTSB number:** ENG08IA051
- **Event ID:** 20100608X35931
- **Type:** Incident
- **Date:** 2008-06-27
- **Location:** Phoenix (PHX), AZ, USA
- **Coordinates:** 33.434444, -112.01139
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 0
## Aircraft
- **Make:** BOEING
- **Model:** 737
- **Registration:** N514AU
- **FAR Part:** 121
- **Engines:** 2
- **Damage:** MINR
## Conditions
- **Light:** —
- **Weather:** —
## Probable cause

The failure of the MLG was due to cracking in the cylinder wall resulting from a fatigue mechanism which initiated at, and near the inner diameter (ID) surface, with propagation through the wall toward the outer diameter(OD) surface. Crack initiation was due to base metal damage which took the form of over tempered martensite (OTM) and chemical attack/pitting of the base metal.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ENG08IA051) · AI Analytics · CC0 1.0*