NTSB CAROL · Event
Event ATL90MA051
Registry · N331DP
FAA Aircraft Registry record.
Make / Model
BEECH 35-C33
Year of manufacture
1965 · 25 years old at event
Engine
CONT MOTOR I0-470 SERIES (260 hp)
Seats / Engines
4 seats · 1 engine
Last airworthiness date
19650824
ADS-B equipped
Yes — Mode-S A399DF
Registrant of record
AGUAYO DOMINGO
Source: FAA Aircraft Registry (releasable master file).
Aircraft involved
Probable cause & findings
THE FLIGHT CREW BECAME INCAPACITATED FOR UNDETERMINED REASONS AND LOST CONTROL OF THE AIRPLANE.
Factual narrative
AT 0515 EST, THE FLT WAS CLRD FOR TAKEOFF ON A FLT FM YPLISANTA, MI TO LOUISVILLE, KY. ABT 17 MIN LATER, THE FLT CREW BGN TO DISPLAY INDCNS OF A DETERIORATION OF THEIR ABILITY TO CTL THE ACFT. AT 1ST, THEY DEVIATED FM INSTRNS TO HOLD WEST OF THE FINDLAY VOR AT FL220. AS THE FLT CONTD & WAS CLRD TO FL270, THE CREW DISPLAYED CONFUSION ABT MAG HDGS & BASIC INSTRNS. AT 1048 EST, THE ACFT DEVIATED FM THE EN ROUTE HDG & THE WRONG HDG WAS READ BACK AFTER A HDG CORRECTION WAS GIVEN. ALSO, THE ACFT CONTD CLIMBING (TO FL291), THEN RADAR & RADIO CTC WERE LOST AT 0551 EST. THE CTLR NOTED THE PLT'S SPEECH WAS SLURRED & SOME PORTIONS OF THE CONVERSATION WERE UNINTELLIGIBLE. SUBSEQUENTLY, THE ACFT CRASHED IN A STEEP DIVE. NO PREIMPACT PART FAILURE WAS VERIFIED, THOUGH IMPACT FORCES & POST-CRASH FIRE RESULTED IN EXTSV DMG OF THE ACFT. THE ACFT WAS EQUIPPED WITH OXYGEN & PRESSURIZATION SYS. NO AUDIBLE WARNING WAS NOTED ON ATC RECORDINGS TO INDC THE CABIN ALT HAD EXCEEDED 10,000', THOUGH THE ACFT WAS EQUIPPED WITH SUCH A DEVICE. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12
Verbatim from NTSB's published report. Source file
NTSB_1990_ATL90MA051.txt.
Findings + structured fields enriched from FAA avall.mdb.
Full investigation docket 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.
- NASA NTRS 2026 · Contractor Report (CR)
Icing Physics Studies Using the 3D SIDRM Test Article: 2023 Icing Tests Analysis
In-flight icing is an important safety issue and is a factor that affects aircraft design and performance. Newer regulations are driving a need for improvements in airframe and engine icing simulation…
- Flight Safety Foundation 2024 · FSF / AeroSafety World
Helicopter Safety Performance Data 2023
Foundation 2023 helicopter safety performance data — global accident rates by mission profile (HEMS, off-shore oil, air-tour, agricultural, news/utility).
- Embry-Riddle Scholarly Commons 2024 · Journal article (IJAAA)
Exploring the atmospheric and weather conditions for hoar frost formation at OR Tambo International Airport: A case study of ground aircraft icing events for the period 2017-2023.
Ground aircraft icing has an adverse effect on the aerodynamic performance of aircrafts as well as the efficient operations of airlines and airports.
- NASA NTRS 2023 · Presentation
NASA Icing Overview 2023
This presentation summarizes NASA icing research for an invited talk to be presented on June 22, 2023, at the SAE International Conference on Icing of Aircraft, Engines, and Structures.
- Flight Safety Foundation 2023 · FSF / AeroSafety World
Controlled Flight Into Terrain (CFIT) — A 2023 Industry Refresh
Foundation 2023 CFIT data refresh — three decades after the original CFIT Task Force eliminated >95% of air-carrier CFIT, the GA + Part 135 communities still account for most CFIT fatalities.
- Embry-Riddle Scholarly Commons 2023 · Industry report (AQRR)
Airline Quality Rating 2023
The Airline Quality Rating (AQR) was developed and first announced in early 1991 as an objective method for assessing airline quality on combined multiple performance criteria.
Browse the full corpus — academia portal ↗