DEN84LA128

NTSB accident investigation · Cessna 421C · Farmington, NM · April 15, 1984

Accident · No injuriesLimited investigationFinal report
Date
April 14, 1984, 23:50 local (Apr 15, 1984, 06:50 UTC)
Place
Farmington, NM
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Taxi
Aircraft
N6205XCessna 421C
Weather
Visual (VMC) · Night/dark
Status
Completed
Report
Approved by Office Director
FAA report
19840414013619A
Case key
16363

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

Main gear collapsedTaxi - from landing
Hydraulic system - contaminationCause
Landing gear,gear locking mechanism - movement restrictedCause
Landing gear,gear locking mechanism - unlocked

Analysis

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.

Aircraft

Registration
N6205X
Reported as
Cessna 421C
Category
Airplane
Serial number
421C0901
Airframe hours
1,380
Engine
Continental GTSIO-520-N, 375 horsepower, reciprocating
Damage
Substantial damage
Flight
Executive/Corporate · Part 91
Registered owner
Aztec Well Servicing Co.
Airworthiness certificate
Standard, Normal
Last inspection
100 hour · September 15, 1983 · 8 hours before
Departed
EO2 · Odessa, TX
Flight plan
IFR
Airport
FMN · Farmington Muni

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
37
Certificate
Airline transport
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Valid Medical--w/ waivers/lim
Seat
Left
Flight hours
7,369 total · 1,450 in this make and model · 7,163 as pilot in command · 118 in the last 90 days · 4 in the last 24 hours

Weather

Conditions
Visual (VMC) · Night/dark
Wind
330° at 4 knots
Visibility
15 statute miles
Lowest ceiling
None
Temperature
41 °F, dew point 1 °F
Altimeter
30.00 inHg
Observed at
FMN

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.