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NTSB Report
April 10, 1989 · Cessna 172RG · N9688B
Miamisburg, OH
Overview
Report Status
Probable Cause
Event Type
Accident
Date
April 10, 1989
Injury Outcomes
No injuries (1 uninjured)
Location
Miamisburg, OH
Aircraft
Cessna 172RG
Tail Number
N9688B
Operator
Dunbar Lee R & Jeffrey T
Injuries
None
Aircraft Damage
Substantial
NTSB Number
ATL89LA124
FOLLOWING IFR FLIGHT PIC LANDED AT UNCONTROLLED FIELD. ON LANDING ROLL LEFT MAIN GEAR COLLAPSED. SUBSEQUENT EXAM OF ACFT REVEALED A CHAFED WIRE FOR NOSE GEAR MICRO SWITCH GROUNDED AGAINST AIRFRAME. RESULTED IN GEAR MOTOR CB OPENING & STOPPING GEAR EXTENSION PRIOR TO FULL EXTENSION OF LEFT MAIN GEAR. ALSO, INTERNAL FAILURE OF THROTTLE WARNING SWITCH DID NOT PROVIDE AN UNSAFE GEAR VISUAL OR AURAL WARNING.
NTSB Probable Cause
INTERMITTANT GROUNDING OF AN ELECTRICAL WIRE TO THE NOSE LANDING GEAR. THE CHAFED WIRE RESULTED IN THE OPENING OF THE LANDING GEAR MOTOR CIRCUIT BREAKER PREVENTING FULL EXTENSION OF THE LEFT MAIN LANDING GEAR. A SECONDARY FAILURE OF THE THROTTLE WARNING SWITCH PRECLUDED A VISUAL OR AURAL WARNING OF THE UNSAFE GEAR POSITION.
Full Narrative
FOLLOWING IFR FLIGHT PIC LANDED AT UNCONTROLLED FIELD. ON LANDING ROLL LEFT MAIN GEAR COLLAPSED. SUBSEQUENT EXAM OF ACFT REVEALED A CHAFED WIRE FOR NOSE GEAR MICRO SWITCH GROUNDED AGAINST AIRFRAME. RESULTED IN GEAR MOTOR CB OPENING & STOPPING GEAR EXTENSION PRIOR TO FULL EXTENSION OF LEFT MAIN GEAR. ALSO, INTERNAL FAILURE OF THROTTLE WARNING SWITCH DID NOT PROVIDE AN UNSAFE GEAR VISUAL OR AURAL WARNING.
Flight
Event TypeAccident
Event Time10:30 EDT
Nearest AirportDayton General Arpt South (0nm N)
Runway2
Runway Length5000 ft
Runway Width100 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna 172RG
Tail NumberN9688B
Aircraft CategoryAir
DamageSubstantial
OperatorDunbar Lee R & Jeffrey T
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-360-F1A6 · Reciprocating · 180
Seats4
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 50 · Third Class
Conditions
ConditionsVMC
LightDaylight
Wind10° @ 4 kt
Visibility7 sm
CeilingNone
Temperature / Dew Point28 C / 12 C
Altimeter30.00 inHg
Observation Time13:50
Weather SourceWFAC