CHI91FA035

NTSB accident investigation · Piper PA-31T2 · Des Moines, IA · November 29, 1990

Accident · FatalField investigationFinal report
Date
November 29, 1990, 10:16 local (16:16 UTC)
Place
Des Moines, IA
Injuries
1 fatal
Damage
Destroyed
Phase of flight
Approach
Aircraft
N1879WPiper PA-31T2
Weather
Visual (VMC) · Day
Status
Completed · report March 5, 1993
Report
Approved by Office Director
FAA report
19901129052179A
Case key
14889

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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Probable cause

The pilot's improper emergency procedures by not feathering the left engine after it lost power and/or was shut down, and his failure to keep the aircraft at or above the minimum control airspeed (VMC), which resulted in a loss of aircraft control. A factor related to the accident was: an undetermined problem concerning the left engine that caused it to lose power or prompted the pilot to shut it down.

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 powerApproach - vfr pattern - final approach
1 engine
Reason for occurrence undeterminedFactor
Loss of control - in flightApproach - vfr pattern - final approach
Emergency procedure - improperPilot in commandCause
Propeller feathering - not attainedPilot in commandCause
Airspeed(vmc) - not maintainedPilot in commandCause
Aircraft control - not maintainedPilot in commandCause
In flight collision with terrain/waterApproach

Analysis

On final approach, after being cleared to land, the pilot informed the controller that he might have to shut down an engine. He declined to declare an emergency or request assistance. On short final, the aircraft was observed to roll to the left and descent into the terrain. Subsequent examination revealed evidence that the left engine was not developing power, although the left propeller was not feathered. There was evidence that the right engine was producing high power during impact. No mechanical deficiency of the left engine or propeller was found.

Aircraft

Registration
N1879W
Reported as
Piper PA-31T2
Category
Airplane
Serial number
31T-8166065
Engine
P&W PT6A-135, 620 horsepower, turbo prop
Damage
Destroyed
Fire
On-Ground
Flight
Business · Part 91
Operator
Century Life Of America
Departed
MSN · Madison, WI
Destination
DSM
Flight plan
IFR
Airport
DSM · Des Moines Intl, runway 30R, 9,001 × 150 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
48
Certificate
Airline transport
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Class 2, Valid Medical--w/ waivers/lim
Toxicology
Performed
Flight hours
7,754 total · 4,093 in this make and model

Weather

Conditions
Visual (VMC) · Day
Wind
220° at 7 knots
Visibility
20 statute miles
Lowest ceiling
None
Temperature
-0 °F, dew point -0 °F
Observed at
DSM

FAA reports on this event · 1

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