# NTSB Accident LAX99LA166
> **Schweizer 269C-1** · 1999-04-30 · CONCORD, CA, USA · NONE
## Event
- **NTSB number:** LAX99LA166
- **Event ID:** 20001205X00510
- **Type:** Accident
- **Date:** 1999-04-30
- **Location:** CONCORD, CA, USA
- **Coordinates:** 37.9999, -122.030647
## Injuries
- **Highest injury:** NONE
- **Fatal:** 0
- **Serious:** 0
- **Minor:** 0
- **Uninjured:** 2
- **Total aboard:** 2
## Aircraft
- **Make:** Schweizer
- **Model:** 269C-1
- **Registration:** N6148V
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** SUBS
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

The inadequate supervision of the student pilot by the flight instructor during the practice autorotation, which resulted in a delayed flare and the tail rotor contacting the ground.  A factor was a misinterpreted communication between the flight instructor and student.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=LAX99LA166) · AI Analytics · CC0 1.0*