DEN91LA082

NTSB accident investigation · Boeing DHC-6-300 · Denver, CO · June 12, 1991

Accident · No injuriesLimited investigationFinal report
Date
June 12, 1991, 05:00 local (11:00 UTC)
Place
Denver, CO
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Standing
Aircraft
N242CABoeing DHC-6-300
Weather
Visual (VMC) · Dawn
Status
Completed · report March 24, 1993
Report
Approved by Office Director
FAA report
19910612021359A
Case key
18097

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 failure to perform an adequate preflight, I.e., not following the check list and the normal brake system was inoperative as a result of no hydraulic system pressure (hydraulic system circuit breaker not 'in').

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.

Airframe/component/system failure/malfunctionStanding - engine(s) operating
Landing gear,normal brake system - no pressureCause
Aircraft preflight - inadequatePilot in commandCause
Checklist - not followedPilot in commandCause
Loss of control - on ground/waterTaxi
On ground/water collision with objectTaxi

Analysis

At dawn, the pilot and a mechanic went out to preflight the aircrat and then fly it on a local maintenance test flight. The hydraulic system circuit breaker was not 'in' when the aircraft engines were started. As the right engine RPM began to increase, the aircraft started to move forward. The pilot applied the brakes only to discover there was no hydraulic pressure in the brake lines. Before corrective action could be taken, the aircraft struck a parked aircraft.

Aircraft

Registration
N242CA
Reported as
Boeing DHC-6-300
Category
Airplane
Serial number
342
Engine
P&W PT6-27, 680 horsepower, turbo prop
Damage
Substantial damage
Flight
Business · Part 91
Operator
Corporate Air, Inc.
Airport
DEN · Stapleton International

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
29
Certificate
Airline transport
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Valid Medical--no waivers/lim.
Flight hours
5,521 total · 23 in this make and model · 5,384 as pilot in command · 93 in the last 90 days · 32 in the last 30 days · 2 in the last 24 hours

Weather

Conditions
Visual (VMC) · Dawn
Visibility
15 statute miles
Lowest ceiling
None

FAA reports on this event · 1

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

Other investigations on N242CA · 1

Matched to the same aircraft by N-number and date.