LAX97LA271

NTSB accident investigation · Miller S-1 · Cottonwood, AZ · August 4, 1997

Accident · No injuriesLimited investigationFinal report
Date
August 4, 1997, 08:50 local (15:50 UTC)
Place
Cottonwood, AZ
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N22RMMiller S-1
Weather
Visual (VMC) · Day
Status
Completed · report April 10, 1998
Report
Approved by Office Director
FAA report
19970804020799A
Case key
29862

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 inadequate strength and braking capability of the landing gear and wheel brakes, and the builder's attempt to adapt motorcycle parts to an aircraft application. A factor in this accident was the pilot's lack of familiarity with this experimental aircraft.

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 control - on ground/waterLanding - roll
Flight control,rudder - inadequateCause
Landing gear,tailwheel assembly - inadequateCause
Landing gear,main gear - inadequateCause
Landing gear,normal brake system - inadequateCause
Maintenance,installation - inadequateOwner/builderCause
Acft/equip,inadequate designOwner/builderCause
Landing gear,normal brake system - failureCause
Directional control - not maintainedPilot in command
Lack of total experience in type of aircraftPilot in commandFactor
Ground loop/swerve - not correctedPilot in command
On ground/water encounter with terrain/waterLanding - roll

Analysis

The pilot departed the morning of the accident to get the feel of the airplane. He was coming in for his fourth touchdown when he said he came in too fast and rolled out too far. He stated the left brake did not respond. A postaccident examination of the aircraft was conducted by an FAA airworthiness inspector. He reported that the aircraft design had several deficiencies. The rudder was very small and the 2-inch tail wheel horn was short. The wheels and brakes were from a Honda motorcycle, which was originally designed for a 200 pound motorcycle. This aircraft weighs approximately 1,200 pounds. The pilot had 2 hours of flight time in this airplane prior to the accident flight. There were no preimpact failures noted on the wheels and brakes.

Factual narrative

On August 4, 1997, at 0850 hours mountain standard time, a Miller S-1, N22RM, ground looped during landing at Cottonwood, Arizona. The aircraft sustained substantial damage and the commercial pilot was not injured. The airplane was operated as a personal flight under 14 CFR Part 91 when the accident occurred. The flight originated at Montezuma Airport, Camp Verde, Arizona, at 0830. Visual meteorological conditions prevailed at the time of the accident.

According to the information provided in his report, the pilot had 2 hours in this particular aircraft. The pilot stated that he took off the morning of the accident flight to "get the feel of the aircraft and how it controlled and reacted." When he landed during his fourth touchdown, he said he "came in a little too fast and the roll out was too far." He stated that the right brake responded but that the left brake did not respond. The airplane went off the right side of runway 32 and came to rest at a 90-degree angle to the runway.

An FAA airworthiness inspector from the Scottsdale, Arizona, Flight Standards District Office examined the aircraft. He reported that the aircraft design had several deficiencies. He found that the rudder was too small for this aircraft and stated that the rudder would have no steering effect while the tail wheel was on the ground. Additionally, he stated that the tail wheel horn arm was minimal and would be very unresponsive considering the 2-inch diameter size of the tail wheel. He also reported that the main wheels and brakes are from a Honda "50" motorcycle. The original motorcycle design was intended to support a 200-pound vehicle. The aircraft is approximately 1,200 pounds. The inspector could not find any evidence of preimpact failure or malfunction with the landing gear or brake systems.

Aircraft

Registration
N22RM
Reported as
Miller S-1
Category
Airplane, amateur-built
Serial number
001
Engine
Lycoming O-320, 150 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
Roy W. Miller
Airworthiness certificate
Special, Experimental (Special)
Departed
7E7 · Camp Verde, AZ
Destination
P52
Airport
P-52 · Cottonwood, runway 32, 4,250 × 75 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
66
Certificate
Commercial
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 3, Valid Medical--w/ waivers/lim
Flight hours
4,910 total · 2 in this make and model · 4,834 as pilot in command · 2 in the last 90 days · 2 in the last 30 days · 2 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
80° at 5 knots
Visibility
10 statute miles
Lowest ceiling
5,000 ft broken
Temperature
64 °F, dew point 59 °F
Altimeter
30.00 inHg
Observed at
FLG

FAA reports on this event · 1

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