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
June 13, 2017 · Bell 214 B · HL9157
Dongducheon, KR
Overview
Report Status
Factual report
Event Type
Accident
Date
June 13, 2017
Injury Outcomes
2 injuries (2 serious injuries)
Location
Dongducheon, KR
Aircraft
Bell 214 B
Tail Number
HL9157
Injuries
Serious
Aircraft Damage
Substantial
NTSB Number
ANC17WA031
On June 13, 2017, about 1810 local time, a Republic of Korea registered Bell 214B helicopter, HL9157, operated by UB Air, impacted remote mountainous terrain about 3 miles northeast of Dongducheon, Republic of Korea, during the approach to a drop zone while conducting an external load operation. The helicopter sustained substantial damage and the 2 pilots received serious injuries. The investigation is under the jurisdiction of the Aviation and Railway Accident Investigation Board, Republic of Korea. As the state of manufacture of the helicopter and the engine, the National Transportation Safety Board has designated a US accredited representative to assist the Aviation and Railway Accident Investigation Board. Further information pertaining to this accident may be obtained from: Aviation and Railway Accident Investigation Board Ministry of Land, Infrastructure and Transport #94 Dasom-Ro 2 Sejong Self-Governing City, 339-012 Republic of Korea Phone: +82 (44) 201-5447 Fax: +82 (44) 201-5698 http://araib.molit.go.kr/intro.do
Full Narrative
On June 13, 2017, about 1810 local time, a Republic of Korea registered Bell 214B helicopter, HL9157, operated by UB Air, impacted remote mountainous terrain about 3 miles northeast of Dongducheon, Republic of Korea, during the approach to a drop zone while conducting an external load operation. The helicopter sustained substantial damage and the 2 pilots received serious injuries. The investigation is under the jurisdiction of the Aviation and Railway Accident Investigation Board, Republic of Korea. As the state of manufacture of the helicopter and the engine, the National Transportation Safety Board has designated a US accredited representative to assist the Aviation and Railway Accident Investigation Board. Further information pertaining to this accident may be obtained from: Aviation and Railway Accident Investigation Board Ministry of Land, Infrastructure and Transport #94 Dasom-Ro 2 Sejong Self-Governing City, 339-012 Republic of Korea Phone: +82 (44) 201-5447 Fax: +82 (44) 201-5698 http://araib.molit.go.kr/intro.do
Flight
Event TypeAccident
Event Time18:10
Nearest Airport0nm
Aircraft FireUnknown
Aircraft ExplosionUnknown
Aircraft
AircraftBell 214 B
Tail NumberHL9157
Aircraft CategoryHeli
DamageSubstantial
People & Injuries
Injury Summary2 injuries (2 serious injuries)
Fatal0
Serious2
Minor0
Uninjured0
Total2
Conditions
WindCalm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0