# NTSB Incident CHI96IA157
> **Boeing 727-290** · 1996-05-13 · INDIANAPOLIS, IN, USA · MINR
## Event
- **NTSB number:** CHI96IA157
- **Event ID:** 20001208X05709
- **Type:** Incident
- **Date:** 1996-05-13
- **Location:** INDIANAPOLIS, IN, USA
- **Coordinates:** 39.73001, -86.290573
## Injuries
- **Highest injury:** MINR
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 11
- **Uninjured:** 101
- **Total aboard:** 112
## Aircraft
- **Make:** Boeing
- **Model:** 727-290
- **Registration:** N775AT
- **FAR Part:** 121
- **Engines:** 3
- **Damage:** —
## Conditions
- **Light:** NDRK
- **Weather:** VMC
## Probable cause

the failure of the captain and flight engineer to utilize a checklist to troubleshoot a pressurization system problem, and the flight engineer's improper control of the pressurization system which resulted in an inadvertent opening of the outflow valve and subsequent airplane decompression.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CHI96IA157) · AI Analytics · CC0 1.0*