NTSB CAROL · Event
Event OAK69D0291
Registry · N104X
FAA Aircraft Registry record.
Make / Model
SMITH THORP T-18
Year of manufacture
1970
Engine
LYCOMING O&VO-360 SER (180 hp)
Seats / Engines
2 seats · 1 engine
Last airworthiness date
19791210
ADS-B equipped
Yes — Mode-S A0159D
Registrant of record
LEIDER ROBERT G
Source: FAA Aircraft Registry (releasable master file).
Aircraft involved
Historical record (pre-1982)
NTSB recorded this accident in the pre-1982 coded-field schema — structured fields rather than free-text narrative. Decoded codes use established NTSB single-letter taxonomies; cause factors remain verbatim pending the Form 6120.4 codebook lookup.
Aircraft
BEECH 35 · N104X
Damage
Destroyed
Craft type
Airplane
Classification
Accident
Light condition
Dawn
Weather
VMC
Phase of flight
D1
Operator type
D
Kind of flying
DE
Weather at impact
Sky
CLEAR
Aircraft history
Total time
4,600 hrs
Pilot
Certificate
Commercial
Total hours
971
Age
41
Probable cause (from PRE1982.MDB)
ED A FORMING SIERRA WAVE.
Investigator remarks
WX BRIEFING GIVEN BY CAP PERSONNEL,PLT ENCOUNTER
Cause factors
- 82/C/M C WEATHER DOWNDRAFT,UPDRAFTS Cause
Decoded against the NTSB Form 6120.4 cause-factor codebook (ct_Pre1982 table). Each row shows the raw triplet, modifier (Cause / Factor / etc.), category, and specific code.
Source: NTSB pre-1982 historical archive. Docket
3 1040.
Source file
NTSB_1969_3_1040.txt.
Modern CAROL record on
data.ntsb.gov ↗.
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Related research
What the literature says.
Academic papers and agency reports matching this event's aircraft type. Sourced from NASA NTRS, NTSB Safety Studies, FAA CAMI, AOPA Air Safety Institute, Embry-Riddle Scholarly Commons, arXiv, and the Semantic Scholar academic graph.
- Embry-Riddle Scholarly Commons 2025 · Journal article (JAAER)
Editor's Note: Celebrating 35 Years of Scholarly Excellence
A letter from the editor, Dr. Dahai Liu, on the JAAER's 35th anniversary.
- NASA NTRS 2024 · Presentation
Part 135 and Business Operator Low Altitude Events: An Analysis of ASRS Reports
This presentation provides an aviation SME's human factors analysis of selected Low Altitude and Controlled Flight Towards Terrain (CFTT) events involving Part 135 and business jet operators as report…
- NASA NTRS 2022 · Conference Paper
The In-time Aviation Safety Management System Concept for Part 135 Operators
Transformations of the National Airspace System, such as envisioned with Advanced Air Mobility, will enable improvements for managing and assuring safety for Part 135 transportation of passengers and …
- Embry-Riddle Scholarly Commons 2022 · Journal article (JAAER)
SMS for Part 135 Commuter and On-Demand Operations - The Practitioner’s Perspective
On May 15th, 2017, N452DA, a Learjet 35A operated by Trans-Pacific Air Charter, LLC, departed from Philadelphia to Teterboro, New Jersey (TEB) on a positioning flight under 14 Code of Federal Regulati…
- NTSB Aircraft Accident Reports 2021 · Accident report
Crash of Atlas Air Flight 3591, Boeing 767-300 (N1217A)
Atlas Air 3591 crashed into Trinity Bay, Texas, February 23, 2019. Investigation of the in-flight loss-of-control crash of Atlas Air 3591 into Trinity Bay, Texas.
- Embry-Riddle Scholarly Commons 2020 · Journal article (IJAAA)
Analysis of Part 135 Aircraft Accidents to Facilitate Flight Data Monitoring
The scheduled and on-demand air services with Title 14 Code of Federal Regulations (CFR) Part 135 certificate are operating with relatively less stringent safety program criteria compared to Part 121 …
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