Overall Trends
Total, fatal, and serious accidents in the selected range.
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
Search everything
Fast key and full-text search with live filters, watches, and precise metadata.
Use quotes for exact phrase matches (for example "fuel selector valve").
Featured 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…
High-signal investigations
Major cases, deep-report coverage, and investigation media across decades of NTSB history.
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 manufacturersAirports
More airportsOperators
More operatorsAbout
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
August 10, 1991 · Lars AVID Flyer · N49BP
Colorado Spring, CO
Overview
Report Status
Probable Cause
Event Type
Accident
Date
August 10, 1991
Injury Outcomes
No injuries (1 uninjured)
Location
Colorado Spring, CO
Aircraft
Lars AVID Flyer
Tail Number
N49BP
Operator
Muenzel Hans G A
Injuries
None
Aircraft Damage
Substantial
NTSB Number
DEN91LA112
THE PILOT REPORTED HEARING TWO SUCCESSIVE LOUD EXPLOSIONS. ENGINE RPMS DROPPED FROM 6500 TO 2800-3000, AND THE ENGINE DID NOT RESPOND TO THROTTLE APPLICATION. THE PILOT MADE A NO-FLAP FORCED LANDING. WHEN HE ATTEMPTED TO FLARE WITH FULL AFT ELEVATOR, THERE WAS NO RESPONSE. CONTROL CONTINUITY WAS LATER ESTABLISHED. THE ENGINE WAS FUNCTIONALLY TESTED AND DEVELOPED FULL POWER. SUBSEQUENT ENGINE DISASSEMBLY DISCLOSED THE PISTON RINGS WERE STUCK IN THE RING GROOVES.
NTSB Probable Cause
THE PILOT'S DELAY IN FLARING THE AIRPLANE. FACTORS WERE: (1) STUCK PISTON RINGS AND (2) THE PILOT'S FAILURE TO USE FLAPS.
Full Narrative
THE PILOT REPORTED HEARING TWO SUCCESSIVE LOUD EXPLOSIONS. ENGINE RPMS DROPPED FROM 6500 TO 2800-3000, AND THE ENGINE DID NOT RESPOND TO THROTTLE APPLICATION. THE PILOT MADE A NO-FLAP FORCED LANDING. WHEN HE ATTEMPTED TO FLARE WITH FULL AFT ELEVATOR, THERE WAS NO RESPONSE. CONTROL CONTINUITY WAS LATER ESTABLISHED. THE ENGINE WAS FUNCTIONALLY TESTED AND DEVELOPED FULL POWER. SUBSEQUENT ENGINE DISASSEMBLY DISCLOSED THE PISTON RINGS WERE STUCK IN THE RING GROOVES.
Flight
Event TypeAccident
Event Time10:15 MDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftLars AVID Flyer
Tail NumberN49BP
Aircraft CategoryAir
DamageSubstantial
OperatorMuenzel Hans G A
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsBombardier · ROTAX 532 · Reciprocating · 65
Seats2
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 63 · Third Class
Conditions
ConditionsVMC
LightDaylight
Wind160° @ 5 kt
Visibility50 sm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0
Weather SourcePILO