# NTSB Accident CHI99LA078
> **Gates Learjet 35** · 1999-01-29 · CHICAGO, IL, USA · NONE
## Event
- **NTSB number:** CHI99LA078
- **Event ID:** 20001204X00035
- **Type:** Accident
- **Date:** 1999-01-29
- **Location:** CHICAGO, IL, USA
- **Coordinates:** 41.780048, -87.770462
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** Gates Learjet
- **Model:** 35
- **Registration:** N130F
- **FAR Part:** 135
- **Engines:** 2
- **Damage:** SUBS
## Conditions
- **Light:** NDRK
- **Weather:** VMC
## Probable cause

the second pilot's failure to maintain adequate airspeed which resulted in an inadvertent stall mush.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=CHI99LA078) · AI Analytics · CC0 1.0*