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

June 21, 1991 · Maule M4-220-C · N40304

Fairbanks, AK

Overview

Report Status
Probable Cause
Event Type
Accident
Date
June 21, 1991
Injury Outcomes
No injuries (2 uninjured)
Location
Fairbanks, AK
Aircraft
Maule M4-220-C
Tail Number
N40304
Operator
Max C Lyon Jr
Injuries
None
Aircraft Damage
Substantial
NTSB Number
ANC91LA078

SHORTLY AFTER LIFTOFF, THE AIRPLANE CRASHED IN A WOODED AREA NEXT TO THE AIRPORT. AFTER THE ACCIDENT, IT WAS REVEALED THAT BOTH FLOATS HAD A LARGE AMOUNT OF WATER IN THEM. THE PIC STATED HE BELIEVED THAT THE AIRPLANE WAS OVER GROSS WEIGHT BY 200 POUNDS.

NTSB Probable Cause

THE PILOT'S FAILURE TO MAINTAIN AIRSPEED DURING THE INITIAL CLIMB AND EXCEEDING THE GROSS WEIGHT OF THE AIRPLANE. CONTRIBUTING TO THE ACCIDENT WAS HIGH VEGETATION.

Full Narrative

SHORTLY AFTER LIFTOFF, THE AIRPLANE CRASHED IN A WOODED AREA NEXT TO THE AIRPORT. AFTER THE ACCIDENT, IT WAS REVEALED THAT BOTH FLOATS HAD A LARGE AMOUNT OF WATER IN THEM. THE PIC STATED HE BELIEVED THAT THE AIRPLANE WAS OVER GROSS WEIGHT BY 200 POUNDS.

Flight

Event TypeAccident
Event Time00:07 AKDT
Nearest AirportFairbanks Int'L Airport (0nm)
Runway1
Runway Length5400 ft
Runway Width150 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo

Aircraft

AircraftMaule M4-220-C
Tail NumberN40304
Aircraft CategoryAir
DamageSubstantial
OperatorMax C Lyon Jr
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsFranklin · GA-350-C1 · Reciprocating · 220
Seats4

People & Injuries

Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 44 · Third Class

Conditions

ConditionsVMC
LightDaylight
Wind300° @ 6 kt
Visibility80 sm
CeilingNone
Temperature / Dew Point46
Altimeter30.00 inHg
Observation Time03:07
Weather SourceWFAC

Appendix: Source Data