MIA95LA165 · Cessna 172P
Cessna 172P · Accident: total loss of engine power (non-mechanical) en route
From St. Petersburg Clearwater International Airport (PIE) to PBI · West Palm Beach, FL
Event
- NTSB case
- MIA95LA165
- 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
Cessna 172P
- Aircraft type
- Cessna 172
- Category
- Airplane
- 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
- N96567
- Operator
- David A. Straz · private individual
- Onboard fatalities
- Unknown
- Route
- From St. Petersburg Clearwater International Airport (PIE), St. Petersburg, FLTo PBI · West Palm Beach, FL
- 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
- Total loss of engine power (non-mechanical)
- 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
- Fuel system, vent › Failure, total
Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.
NTSB narrative
THE PILOT STATED THAT DURING CRUISE FLIGHT AT 5,000 FEET ABOUT AN HOUR AFTER DEPARTURE, THE ENGINE EXPERIENCED A LOSS OF POWER. MOMENTARY APPLICATION OF CARBURETOR HEAT RESTORED ENGINE POWER BUT THE ENGINE AGAIN FAILED. DURING THE FORCED LANDING THE AIRPLANE COLLIDED WITH TREES. EXAMINATION OF THE ENGINE REVEALED CRANKSHAFT, CAMSHAFT, AND VALVE TRAIN CONTINUITY. DIFFERENTIAL COMPRESSION OF ALL CYLINDERS USING 80 PSI AS A BASE REVEALED NUMBERS GREATER THAN 70 PSI. EACH MAGNETO TO ENGINE TIMING WAS DETERMINED TO BE CORRECT AND THE MAGNETOS WERE REMOVED FOR BENCH TESTING WHICH REVEALED THAT THE RIGHT MAGNETO WAS OPERATING NORMALLY. THE LEFT MAGNETO WAS FOUND TO BE FIRING INTERMITTENTLY DUE TO PARTIAL FAILURE OF THE IGNITION COIL. EXAMINATION OF THE FUEL VENT SYSTEM REVEALED THAT A VENTED FUEL CAP WAS FOUND SECURED BY CHAIN TO THE LEFT FUEL TANK FILLER PORT AND A NON- VENTED FUEL CAP WAS SECURED BY CHAIN TO THE RIGHT FUEL TANK PORT. THE CORRECT POSITIONS FOR VENTED AND NON-VENTED FUEL CAPS IS OPPOSITE FROM THE POSITIONS IN WHICH THEY WERE FOUND. ADDITIONALLY, A MALFUNCTION OF THE VENT VALVE ASSEMBLY WAS NOTED. THE VENT VALVE ASSEMBLY WAS NOT REMOVED FOR EXAMINATION. THE AIRPLANE HAD ACCUMULATED ABOUT 3.9 HOURS SINCE AN ANNUAL INSPECTION WAS PERFORMED ON APRIL 6, 1995.
Probable cause
TOTAL FAILURE OF THE FUEL VENT SYSTEM RESULTING IN THE TOTAL LOSS OF ENGINE POWER DURING CRUISE FLIGHT. CONTRIBUTING TO THE ACCIDENT WAS THE INADEQUATE INSPECTION OF THE AIRPLANE DURING THE LAST ANNUAL INSPECTION FOR FAILURE OF THE MECHANIC TO IDENTIFY THAT THE VENTED AND NON-VENTED FUEL CAPS WERE INCORRECTLY POSITIONED.
Verbatim NTSB analysis and probable cause from the NTSB dataset
Sources
NTSB record MIA95LA165
- Event ID
- 20001207X03782
- Case number
- MIA95LA165
- 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: a8c683f2bc81a1e6573a619bfb914a1c0a36bab24b2b8033beb5aff43a8eb5e0; retrieved 2026-09-21T22:12:49.689Z.