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Aviation safety reports, made easier to study

NTSB Reports is an independent research and search tool for public aviation accident and incident records. It brings NTSB aviation reports, structured fields, docket files, extracted figures, photos, videos, and update history into one searchable interface.

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NTSB Report

January 12, 1992 · Beech 58 · N4188S

West Palm Beach, FL

Overview

Report Status
Probable Cause
Event Type
Accident
Date
January 12, 1992
Injury Outcomes
No injuries (5 uninjured)
Location
West Palm Beach, FL
Aircraft
Beech 58
Tail Number
N4188S
Operator
Beco Aviation
Injuries
None
Aircraft Damage
Substantial
NTSB Number
MIA92LA063

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.

NTSB Probable Cause

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

Full 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.

Flight

Event TypeAccident
Event Time16:15 EST
Nearest AirportPalm Beach International (0nm)
Runway13
Runway Length6930 ft
Runway Width150 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo

Aircraft

AircraftBeech 58
Tail NumberN4188S
Aircraft CategoryAir
DamageSubstantial
OperatorBeco Aviation
Operating RulePart 91
Engines2
Engine TypeReciprocating
Engine DetailsContinental · IO-520C · Reciprocating · 285
Seats6

People & Injuries

Injury SummaryNo injuries (5 uninjured)
Fatal0
Serious0
Minor0
Uninjured5
Total5
Crew 1Age 36 · Second Class

Conditions

ConditionsVMC
LightDaylight
Wind160° @ 10 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point57
Altimeter30.00 inHg
Observation Time21:15
Weather SourceWFAC

Appendix: Source Data