FTW85FA019

NTSB accident investigation · Cessna 421C · Addison, TX · October 18, 1984

Accident · FatalField investigationFinal report
Date
October 18, 1984, 14:52 local (19:52 UTC)
Place
Addison, TX
Injuries
1 fatal
Damage
Destroyed
Phase of flight
Enroute
Aircraft
N121BTCessna 421C
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
FAA report
19841018056419A
Case key
21499

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.

Loss of engine power(total) - mech failure/malfClimb - to cruise
Aircraft preflight - inadequatePilot in commandFactor
Operation with known deficiencies in equipment - performedPilot in commandFactor
Fluid,oil - starvationFactor
Propeller feathering - performed
Initiated
Precautionary landing - initiated
Loss of control - in flightDescent - normal
Emergency procedure - improperPilot in commandCause
Gear extension - prematurePilot in commandCause
Airspeed(vmc) - not maintainedPilot in commandCause
Aircraft handling - not maintainedPilot in commandCause
In flight collision with objectDescent - uncontrolled
Object - building(nonresidential)
Object - utility pole
In flight collision with terrain/waterDescent - uncontrolled

Analysis

Aprx 7 min after takeoff (at 1441), the plt declared an emergency & said the l eng had lost power. He feathered the eng,diverted back twd the arpt & dscndd to VFR conds below the clds. At 1448, the plt said he had the arpt in sight & turnedonto a left downwind for rwy 15. Rprtdly, he extended the lndg gear & bgn a left turn twd the rwy. Rprdly, the acft was too close in &/or the plt chose to make a rgt turn away fm the arpt to land. Witnesses lost sight of the acft drg the turn due to low clds or obstns. The plt lost sight of the arpt for a short time, then relocated it, but said he had his 'hands full.' Shortly thereafter, the acft entered a steep dscnt, hit the edge (roof) of a bldg, crashed into a utilitypole & the ground & burned. There was evidence the acft was inverted just before impact. An exam of the l eng revealed evidence the #6 connecting rod had failed fm oil exhaustion. Only 1 cup of oil was fnd in the eng & it had a history of hi oil consumption.

Aircraft

Registration
N121BT
Reported as
Cessna 421C
Category
Airplane
Serial number
421C0806
Engine
Continental GTSIO-520-L, 375 horsepower, reciprocating
Damage
Destroyed
Fire
On-Ground
Flight
Personal · Part 91
Registered owner
Continental Martgage Inc.
Airworthiness certificate
Standard, Normal; Standard, Utility
Destination
APF · Naples, FL
Flight plan
IFR
Airport
ADS · Dallas Addison, runway 15, 7,199 × 100 ft, asphalt

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
47
Certificate
Private
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 2, Valid Medical--w/ waivers/lim
Toxicology
Performed
Flight hours
1,620 total

Weather

Conditions
Visual (VMC) · Day
Wind
190° at 15 knots
Visibility
8 statute miles
Lowest ceiling
2,500 ft broken
Temperature
81 °F
Altimeter
29.00 inHg
Observed at
ADS, 1 nm away

FAA reports on this event · 1

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