# NTSB Accident ERA11LA388
> **CESSNA 172N** · 2011-07-04 · Orange Beach, AL, USA · NONE
## Event
- **NTSB number:** ERA11LA388
- **Event ID:** 20110708X84345
- **Type:** Accident
- **Date:** 2011-07-04
- **Location:** Orange Beach, AL, USA
- **Coordinates:** 30.285554, -87.535835
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** CESSNA
- **Model:** 172N
- **Registration:** N109DP
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The operation of the airplane using unapproved fuels, which resulted in abnormal combustion and subsequent damage to the No. 3 cylinder. Contributing to the accident was the inadequate 100-hour inspection because the mechanic failed to note the lack of placards by either fuel filler cap specifying the minimum automotive fuel grade and no alcohol allowed as specified by the installed STC’s.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ERA11LA388) · AI Analytics · CC0 1.0*