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ANC23LA063

2023-08-14 · Skwentna, Alaska, United States · None · 1 aircraft · Status: Completed

Airport NA

Current FAA registration · N4891Z

Make / Model
CESSNA U206G
Year of manufacture
1980 · 43 years old at event
Engine
CONT MOTOR IO 520 SERIES (285 hp)
Seats / Engines
6 seats · 1 engine
Last airworthiness date
19930504
ADS-B equipped
Yes — Mode-S A60C9B

Source: FAA Aircraft Registry (releasable master file).

Aircraft involved

Probable cause & findings

The airplane’s float contacted an undetected submerged gravel bar during landing which resulted in a nose over.

Factual narrative

While landing on a river and coming off the float step, the airplane’s float contacted an undetected submerged gravel bar in shallow water. The airplane pivoted, nosed over, and came to rest inverted. The airplane sustained substantial damage to the vertical stabilizer and rudder. The pilot reported that there were no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation. Source: NTSB Aviation Accident Database Retrieved: 2026-02-12

NTSB Findings

FAA avdata. C = Cause, F = Factor.

  • — Environmental issues-Physical environment-Runway/land/takeoff/taxi surface-(general)-Contributed to outcome
  • — Personnel issues-Task performance-Use of equip/info-Aircraft control-Pilot
  • — Environmental issues-Physical environment-Runway/land/takeoff/taxi surface-(general)-Awareness of condition

Verbatim from NTSB's published report. Source file NTSB_2023_ANC23LA063.txt. Findings + structured fields enriched from FAA avall.mdb. Full investigation docket on data.ntsb.gov ↗.

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