NTSB MIA92LA063 — 1992-01-12 · WEST PALM BEACH, Florida, United States

Current FAA registration · N4188S

Make / Model: BEECH 58
Year of manufacture: 1975 · 17 years old at event
Engine: CONT MOTOR IO 520 SERIES (285 hp)
Seats / Engines: 6 seats · 2 engines
Last airworthiness date: 19750410
ADS-B equipped: Yes — Mode-S A4F559

Source: FAA Aircraft Registry (releasable master file).

Aircraft involved

N4188S Beech 58 None

Probable cause & findings

PARTIAL FAILURE OF THE LANDING GEAR MOTOR WHICH CAUSED INTERNAL DAMAGE TO THE LANDING GEAR RETRACT MOTOR AND GEARBOX ASSY.

Factual narrative

AFTER ARRIVING IN THE TRAFFIC PATTERN OF THE DESTINATION ARPT, THE PLT LOWERED THE LANDING GEAR SELECTOR HANDLE BUT THE GEAR DID NOT EXTEND. THE FLT DEPARTED THE PATTERN & ATTEMPTS TO LOWER THE GEAR VIA THE EMERGENCY METHOD WERE UNSUCCESSFUL. THE FLT DIVERTED TO A LARGER ARPT WHERE A GEAR UP LANDING OCCURRED. THE LANDING GEAR RETRACT MOTOR & GEARBOX ASSY WAS REMOVED FROM THE ACFT & DISASSEMBLY REVEALED THAT THE WORM SECTOR GEAR REPEATEDLY CONTACTED THE SECTOR GEAR STOP. ALSO, TWO HALF RINGS WHICH SECURE THE BEARING TO THE WORM ACTUATING SHAFT SHEARED. THIS ALLOWED THE WORM GEAR ACTUATOR TO TRAVEL TOWARD THE MOTOR. AS A RESULT, THE HAND CRANK ENGAGING SHAFT WOULD NOT CONTACT THE WORM GEAR ACTUATOR. ACCORDING TO A MECHANIC, THIS WAS DUE TO A WORN LANDING GEAR MOTOR WHICH WOULD DRIVE THE GEAR BUT WOULD RENDER THE DYNAMIC BRAKING ACTION INOPERATIVE. THE UP-LIMIT SWITCH WAS TESTED & FOUND TO OPERATE NORMALLY. Source: NTSB Aviation Accident Database (Pre-2008 Archive) Retrieved: 2026-02-12

Verbatim from NTSB's published report. Source file NTSB_1992_MIA92LA063.txt. Findings + structured fields enriched from FAA avall.mdb. Full investigation docket on data.ntsb.gov ↗.

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