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LAX93LA051 · Cessna 421C

22 Nov 1992 · Santa Maria, CA, United States

Cessna 421C · Accident: total loss of engine power (mechanical failure) en route

From Lake Tahoe Airport (TVL) to an unrecorded destination

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Event

NTSB case
LAX93LA051
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 421C

Aircraft type
Cessna 421
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
N52AK
Onboard fatalities
Unknown
Route
From Lake Tahoe Airport (TVL), LAKE TAHOE, CATo 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
Total loss of engine power (mechanical failure)
DamageDestroyed: beyond practical repair. Substantial: damage that affects the structure, performance or handling and normally needs major repair. Minor: less than that. Glossary
Destroyed

Cause areas

  • Company maintenance personnel › Maintenance, inspection, inadequate
  • Company maintenance personnel › Maintenance, service bulletin/letter, not followed
  • Ignition system, magneto › Disintegrated
  • Pilot in command › Proper touchdown point, not attained

Approximate · Coordinates as recorded by the NTSB; no uncertainty radius is established.

NTSB narrative

TWELVE MINUTES AFTER DEPARTURE, THE LEFT ENGINE BEGAN TO RUN ROUGH & VIBRATE. THE PILOT SAID HE COULD NOT CORRECT THE PROBLEM & SHUT THE LEFT ENGINE DOWN. NO EMERGENCY WAS DECLARED & THE PILOT TOLD ATC THAT HE WOULD CONTINUE TO HIS DESTINATION, 210 NM & 1.5 HOURS AWAY. THE PILOT OVERFLEW 5 AIRPORTS WITH RUNWAYS OVER 5,000 FT LONG & A MOUNTAIN RANGE. THE PILOT EXECUTED A VOR APPROACH & ENTERED AN EXTENDED DOWNWIND PATTERN. ON SHORT FINAL THE PILOT EXECUTED A GO AROUND BECAUSE HE DID NOT GET ANY GEAR DOWN INDICATIONS. HE THEN MANEUVERED FOR A DOWNWIND LANDING ON RUNWAY 12. THE AIRCRAFT HIT THE GROUND 100 YARDS SHORT OF THE RUNWAY, THEN COLLIDED WITH A DITCH & THE AIRPORT FENCE. AN FAA INSPECTOR SAID THERE WERE THREE CLEAR TIRE TRACKS FROM THE POINT OF TOUCHDOWN TO THE DITCH, WHERE THE GEAR WAS SHEARED OFF. HE FOUND NO PROBLEMS WITH THE GEAR SYSTEM. EXAM OF THE LEFT ENGINE REVEALED A LEFT MAGNETO INTERNAL FAILURE DUE TO LACK OF LUBRICATION & WEAR, WHICH CAUSED CYLINDER CROSS FIRING.

Probable cause

1) THE INTERNAL FAILURE OF THE LEFT ENGINE, LEFT MAGNETO DUE TO INADEQUATE MAINTENANCE AND NON COMPLIANCE WITH THE MANUFACTURERS SERVICE BULLETINS AND RECOMMENDATIONS, AND 2) THE FAILURE OF THE PILOT TO ATTAIN THE PROPER TOUCHDOWN POINT DURING THE LANDING ATTEMPT. FACTORS IN THE ACCIDENT WERE THE INABILITY OF THE PILOT TO SHUT OFF THE LEFT MAGNETO AND THE FALSE LANDING GEAR INDICATIONS, BOTH FOR UNDETERMINED REASONS.

Verbatim NTSB analysis and probable cause from the NTSB dataset

Sources

NTSB record LAX93LA051
Event ID
20001211X16075
Case number
LAX93LA051
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: bf3cc7d31823b0d45cda138dbc5efceef2fda1985f215907225dfc1a37023424; retrieved 2026-09-21T14:37:59.505Z.