# NTSB Accident ANC93FA172
> **INTERSTATE S-1B2 ARCTIC TERN** · 1993-09-08 · TALKEETNA RIVER, AK, USA · SERS
## Event
- **NTSB number:** ANC93FA172
- **Event ID:** 20001211X13279
- **Type:** Accident
- **Date:** 1993-09-08
- **Location:** TALKEETNA RIVER, AK, USA
- **Coordinates:** 61.410034, -149.169433
## Injuries
- **Highest injury:** SERS
- **Fatal:** 0
- **Serious:** 2
- **Minor:** 0
- **Uninjured:** 0
- **Total aboard:** 2
## Aircraft
- **Make:** INTERSTATE
- **Model:** S-1B2 ARCTIC TERN
- **Registration:** N64AT
- **FAR Part:** 091
- **Engines:** 1
- **Damage:** DEST
## Conditions
- **Light:** DAYL
- **Weather:** VMC
## Probable cause

THE PILOT IN COMMAND'S IMPROPER PREFLIGHT PLANNING.  FACTORS IN THE ACCIDENT WERE: THE ROUGH/UNEVEN TAKEOFF LOCATION, THE EXCESS WEIGHT OF THE AIRPLANE, THE INADEQUATE DESIGN OF THE ADD-ON TANK BY THE MANUFACTURER AFFECTING THE WEIGHT AND BALANCE, AND THE INADEQUATE CERTIFICATION/APPROVAL OF THE TANK BY THE FAA.

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*Source: [NTSB CAROL](https://data.ntsb.gov/carol-main-public/basic-search?source=ntsb&type=event&ntsb_number=ANC93FA172) · AI Analytics · CC0 1.0*