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NTSB Report
April 15, 1984 · Cessna 421C · N6205X
Farmington, NM
Overview
Report Status
Preliminary report
Event Type
Accident
Date
April 15, 1984
Injury Outcomes
No injuries (2 uninjured)
Location
Farmington, NM
Aircraft
Cessna 421C
Tail Number
N6205X
Injuries
None
Aircraft Damage
Substantial
NTSB Number
DEN84LA128
WHILE TAXIING AFTER LANDING, THE ACFT WAS IN A LEFT TURN WHEN THE RIGHT MAIN GEAR COLLAPSED. THE PLT REPORTED THAT ALL 3 GEAR INDICATED DOWN & LOCK, BOTH BEFORE & AFTER THE MISHAP. AN EXAM OF THE RIGHT MAIN GEAR ACTUATOR, PN 9910136-4, REVEALED THAT CONTAMINATION HAD COLLECTED ON THE INNER CYLINDER WALL & PREVENTED THE KEYS FROM PROPERLY EXTENDING TO THE LOCKED POSITION. ALSO, THE GEAR SYS WAS DESIGNED TO MAINTAIN HYDRAULIC PRESSURE ON THE DOWN SIDE OF THE ACTUATOR WHEN IT WAS EXTENDED. HOWEVER, THE CONTAMINANT ALSO PREVENTED THE SWITCH (IN THE ACTUATOR) FROM OPERATING PROPERLY.
Full Narrative
WHILE TAXIING AFTER LANDING, THE ACFT WAS IN A LEFT TURN WHEN THE RIGHT MAIN GEAR COLLAPSED. THE PLT REPORTED THAT ALL 3 GEAR INDICATED DOWN & LOCK, BOTH BEFORE & AFTER THE MISHAP. AN EXAM OF THE RIGHT MAIN GEAR ACTUATOR, PN 9910136-4, REVEALED THAT CONTAMINATION HAD COLLECTED ON THE INNER CYLINDER WALL & PREVENTED THE KEYS FROM PROPERLY EXTENDING TO THE LOCKED POSITION. ALSO, THE GEAR SYS WAS DESIGNED TO MAINTAIN HYDRAULIC PRESSURE ON THE DOWN SIDE OF THE ACTUATOR WHEN IT WAS EXTENDED. HOWEVER, THE CONTAMINANT ALSO PREVENTED THE SWITCH (IN THE ACTUATOR) FROM OPERATING PROPERLY.
Flight
Event TypeAccident
Event Time23:50 MST
Nearest AirportFarmington Muni (0nm N)
Runway0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna 421C
Tail NumberN6205X
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines2
Engine TypeReciprocating
Engine DetailsContinental · GTSIO-520-N · Reciprocating · 375
Seats8
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 37 · None
Conditions
ConditionsVMC
LightDark Night
Wind330° @ 4 kt
Visibility15 sm
CeilingNone
Temperature / Dew Point41 C / 1 C
Altimeter30.00 inHg
Observation Time06:50
Weather SourceWFAC