# NTSB Accident DEN89LA074
> **PIPER PA-18-150** · 1989-02-08 · BOULDER, CO, USA · NONE
## Event
- **NTSB number:** DEN89LA074
- **Event ID:** 20001213X27711
- **Type:** Accident
- **Date:** 1989-02-08
- **Location:** BOULDER, CO, USA
- **Coordinates:** 40.019157, -105.250587
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** PIPER
- **Model:** PA-18-150
- **Registration:** N4355Z
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

FAILURE OF THE DUAL STUDENT TO MAINTAIN DIRECTIONAL CONTROL AND THE FAILURE OF THE PILOT IN COMMAND (CFI), TO PROVIDE ADEQUATE REMEDIAL ACTION IN A TIMELY MANNER, TO CORRECT THE SWERVE. A SECOND PROBABLE CAUSE WAS THE CFI'S FAILURE TO PROVIDE ADEQUATE SUPERVISION DURING THE LANDING ROLL. INADEQUATE CREW COORDINATION IS CONSIDERED A FACTOR.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=DEN89LA074) · AI Analytics · CC0 1.0*