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NTSB accident investigation · Dormaier Monte R Baby Great Lakes · Mazama, WA · September 3, 2016

Accident · Minor injuriesData collectionFinal report
Date
September 3, 2016, 10:56 local (17:56 UTC)
Place
Mazama, WA
Injuries
1 minor
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N110MDDormaier Monte R Baby Great Lakes
Defining event
Takeoff: Runway excursion
Weather
Visual (VMC) · Day
Status
Completed · report January 18, 2017
Report
Approved by Office Director
NTSB office
General Aviation Accidents
Parties
FAA
FAA report
20160903016799A
Case key
94009

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 maintain directional control during the takeoff roll, which resulted in a runway excursion.

Findings · 4

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Performance/control parameters: directional controlAircraft › Aircraft oper/perf/capability · Not attained/maintainedDormaier Monte R BABY GREAT LAKES: 1 caseAll aircraft: 3,958 casesProbable cause
Object/animal/substance: poleEnvironmental issues › Physical environment · Contributed to outcomeDormaier Monte R BABY GREAT LAKES: 1 caseAll aircraft: 142 cases
Object/animal/substance: tree(s)Environmental issues › Physical environment · Contributed to outcomeDormaier Monte R BABY GREAT LAKES: 1 caseAll aircraft: 933 cases

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

The Federal Aviation Administration (FAA) Aviation Safety Inspector that responded to the accident site reported that the pilot of the experimental, amateur built, tailwheel landing gear-equipped bi-plane reported to the inspector, that during the takeoff roll the bi-plane drifted off the left side of the turf and gravel runway. The pilot reported that after he had completed his engine run-up and all indications were normal, he lightly applied power and began his takeoff roll from a concrete pad at the approach end of the runway. He reported to the inspector that the bi-plane began to drift to the left and he did not feel as though he had rudder authority, so he added more power with the intent to increase the airflow over the rudder, but the torque from the added power exacerbated the loss of control. The bi-plane drifted further left, exited the runway, and struck a post that supported a satellite dish and subsequently struck a tree. The bi-plane sustained substantial damage to the four wings and the fuselage. The pilot reported to the inspector that in hindsight it would have been better to abort the takeoff. The FAA Inspector reported that during the airplane examination he did not find any evidence of aircraft system or component failure prior to the impact. The NTSB Investigator-in-charge attempted to contact the pilot on multiple occasions to no avail. The pilot did not submit the NTSB Form 6120.1.

Factual narrative

The Federal Aviation Administration (FAA) Aviation Safety Inspector that responded to the accident sight reported that the pilot of the experimental, amateur built, tailwheel landing gear-equipped bi-plane reported to the inspector, that during the takeoff roll the bi-plane drifted off the left side of the turf and gravel runway. The pilot reported that after he had completed his engine run-up and all indications were normal, he lightly applied power and began his takeoff roll from a concrete pad at the approach end of the runway. He reported to the inspector that the bi-plane began to drift to the left and he did not feel as though he had rudder authority, so he added more power with the intent to increase the airflow over the rudder, but the torque from the added power exacerbated the loss of control. The bi-plane drifted further left, exited the runway, and struck a post that supported a satellite dish and subsequently struck a tree. The bi-plane sustained substantial damage to the four wings and the fuselage. The pilot reported to the inspector that in hindsight it would have been better to abort the takeoff. The FAA Inspector reported that during the airplane examination he did not find any evidence of aircraft system or component failure prior to the impact. The NTSB Investigator-in-charge attempted to contact the pilot on multiple occasions to no avail. The pilot did not submit the NTSB Form 6120.1.

Aircraft

Registration
N110MD
Reported as
Dormaier Monte R Baby Great Lakes (NO SERIES)
Category
Airplane, amateur-built
Serial number
7704-A-637-B
Built
1980
Engine
Lycoming O-235-C, 100 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Condition · July 3, 1997
Departed
W12 · Mazama, WA
Destination
W12 · Mazama, WA
Airport
W12 · Lost River Resort, runway 11, 3,150 × 85 ft, gravel
Equipment
Unknown

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
89
Injuries
Minor
Certificates
Commercial, Flight instructor
Airplane ratings
Multi-engine land, Multi-engine sea, Single-engine land
Instrument ratings
Airplane
Medical
Class 2, With waivers/limitations
Last flight review
February 12, 2010
Seat
Single
Restraint
4-point
Flight hours
6,000 total · 124 in this make and model

Weather

Conditions
Visual (VMC) · Day
Wind
30° at 3 knots
Visibility
10 statute miles
Lowest ceiling
7,500 ft broken
Temperature
63 °F, dew point 41 °F
Altimeter
29.97 inHg
Observed at
KOMK, 41 nm away

Docket · 2

The files NTSB released with the investigation on December 16, 2016, on NTSB’s docket system: statements, records, photos and specialists’ reports. 390 KB in all.

FAA reports on this event · 1

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