Premium research interface

The modern interface for aviation safety intelligence.

Search investigations, review source evidence, monitor watched reports, and trace long-term patterns from one calm, data-first workspace.

63k+
Reports indexed
1940-2026
Coverage
Recent
Last data refresh
Featured Report

Loading…

Loading featured report…

Loading…
Open Report

Safety trends by operating rule

Track fatal and non-fatal accident patterns across Part 91, Part 135, and Part 121 operations.

Loading trend charts…

Browse the aviation graph

Move quickly by aircraft, airport, operator, and time with indexes built for research, not wandering.

Last Data Update

By Decade

By Month

Aircraft Manufacturer

More manufacturers

Airports

More airports

Operators

More operators

About

Aviation safety reports, made easier to study

NTSB Reports is an independent research and search tool for public aviation accident and incident records. It brings NTSB aviation reports, structured fields, docket files, extracted figures, photos, videos, and update history into one searchable interface.

The goal is practical safety education: make it faster to find relevant investigations, compare similar events, review factual records, and understand the evidence behind probable-cause and preliminary reports.

The investigative work and source records belong to the National Transportation Safety Board and the published investigation record. This site is not affiliated with or endorsed by the NTSB.

FAQs

NTSB Report

September 5, 2012 · Piper PA-18-150 · N4127Z

Ekwok, AK

Overview

Report Status
Final with probable cause
Event Type
Accident
Date
September 5, 2012
Injury Outcomes
1 injury (1 minor injury)
Location
Ekwok, AK
Aircraft
Piper PA-18-150
Tail Number
N4127Z
Operator
Bieri Michael J
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
ANC12CA101

The pilot was taking off near a river bank in a float-equipped airplane. During the initial climb, the pilot was distracted by the water rudders and looked inside the airplane. During that moment of inattention, the airplane turned toward the river bank and impacted trees. There were no reported preaccident mechanical anomalies with the airplane that would have precluded normal operation.

NTSB Probable Cause

The pilot's diverted attention during the initial climb, which resulted in a collision with trees.

Full Narrative

The pilot was taking off near a river bank in a float-equipped airplane. During takeoff initial climb the pilot was distracted by the water rudders, and looked inside the airplane. During that moment of inattention, the airplane turned toward the river bank, and impacted trees. There were no reported mechanical anomalies with the airplane prior to the accident.

Flight

Event TypeAccident
Event Time17:00 AKDT
Nearest Airport0nm
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo

Aircraft

AircraftPiper PA-18-150
Tail NumberN4127Z
Aircraft CategoryAir
DamageSubstantial
OperatorBieri Michael J
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-320 SERIES · Reciprocating · 160
Seats2

People & Injuries

Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 60 · Third Class · Minor

Conditions

ConditionsVMC
LightDaylight
Wind120° @ 15 kt, gusting 20 kt
Visibility10 sm
CeilingBroken clouds 3000 ft
Temperature / Dew Point46 / 0 C
Altimeter0
Weather SourcePILO

Appendix: Source Data