MIA90LA115 · WILLIAMS, Robert G. AIR COMM. 532 ELITE AIR COMM.
WILLIAMS, Robert G. AIR COMM. 532 ELITE AIR COMM. · Accident: loss of engine power en route
From Clearwater Air Park (CLW) to an unrecorded destination
Event
- NTSB case
- MIA90LA115
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Accident
- InvestigationHow far the investigation had got when the record was published: preliminary, ongoing, final or completed. Unknown where the source does not say. Glossary
- Completed
- API-reported fatalities
- 0 · all aircraft and ground
- Ground fatalities
- 0
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- General aviation
- WeatherVisual meteorological conditions (VMC): good enough to fly by looking outside. Instrument conditions (IMC): cloud or low visibility, flying by instruments. Glossary
- Visual Meteorological Cond
WILLIAMS, Robert G. AIR COMM. 532 ELITE AIR COMM.
- Aircraft type
- Williams Robert AIR COMM 532 ELITE
- Category
- Gyroplane
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- N70319
- Operator
- Unknown
- Onboard fatalities
- Unknown
- Route
- From Clearwater Air Park (CLW), Clearwater, FLTo not recorded
- Aircraft age
- Not recorded
- Flight rulesThe regulations the flight operated under: in the US, Part 91 (general aviation), Part 121 (airlines), Part 135 (air taxi and commuter) and others; for flights abroad, the NTSB's coarser commercial or non-commercial code. Glossary
- Part 91: General Aviation
- Phase of flightThe stage of the flight when things started to go wrong: standing, taxi, takeoff, initial climb, en route, maneuvering, approach or landing. Glossary
- En route · cruise
- First occurrenceThe single coded event the NTSB judges best describes what happened (records from 2008 on). Older records name the first occurrence in the sequence instead. Glossary
- Loss of engine power
- DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
- Substantial
Cause areas
- Cooling system, lines › Separation
- Cooling system, lines › Vibration
- Engine assembly › Overtemperature
Not plotted · Location withheld: coordinates are missing, conflicting, invalid, or have no accepted acquisition method. No substitute location has been invented.
NTSB narrative
DURING CRUISE FLT ABOUT 500 FT OFFSHORE, THE PLT REPORTED THAT THE ENG COOLANT & OIL TEMPERATURE BEGAN RISING. HE ATTEMPTED TO LAND ON THE BEACH BUT WAS UNABLE, & LANDED JUST OFFSHORE. AFTER TOUCHDOWN, THE MAIN ROTOR MAST SEPARATED. EXAM OF THE ENG REVEALED THAT A LIQUID COOLANT LINE SEPARATED FROM THE RADIATOR, DUE TO VIBRATION. THIS ALLOWED THE COOLANT TO DRAIN. ACCORDING TO AN FAA INSPECTOR, THERE WAS NO AIRWORTHINESS CERTIFICATE NOR ENG & ACFT LOGBOOKS. THE PLT HELD A STUDENT PLT CERTIFICATE BUT IT NOR HIS PLT LOGBOOK WAS ENDORSED AUTHORIZING SOLO FLT.
Probable cause
LOSS OF POWER DUE TO THE OVERHEATED ENGINE CAUSED BY A SEPARATED LIQUID COOLANT LINE WHICH ALLOWED THE COOLANT TO DRAIN, RESULTING IN THE FORCED LANDING.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record MIA90LA115
- Event ID
- 20001212X23210
- Case number
- MIA90LA115
- Dataset
- historical-pre2008
- Source SHA-256
- 89e2df6d848e7ab3b42e7d7c7a03ff403303057a26ca04c95b3ea67201c3ce74
Source notes (4)
- Unreviewed is an editorial label, not an investigation status. API-sourced is not report-checked or human-reviewed. Explicit event totals are used without summing aircraft injury tables; onboard allocation is withheld. Unknown values remain unknown. The operation category is mapped from the NTSB-reported FAR part and has not been reviewed.
- Filled from the NTSB case API where the bulk record had no value: investigation status. Values present in the bulk record are kept.
- The date is the local date, which is the same as the UTC date the NTSB stores.
- API snapshot SHA-256: 65be8312228bc969c7bde7fa17e4524fa327099794a825df420a70855ee18b0d; retrieved 2026-09-23T06:23:14.754Z.