DEN06LA011

NTSB accident investigation · Piper PA-18-150 · Cortez, CO · October 26, 2005

Accident · No injuriesLimited investigationFinal report
Date
October 26, 2005, 15:45 local (22:45 UTC)
Place
Cortez, CO
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Approach
Aircraft
N4055ZPiper PA-18-150
Weather
Visual (VMC) · Day
Status
Completed · report April 25, 2006
Report
Approved by Office Director
Parties
Flight Standards District Office
FAA report
20051026025769A
Case key
62642

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

On this page

Probable cause

the pilot's failure to maintain directional control of the airplane, resulting in a ground loop. Contributing factors were the excessive descent rate, the obstacle (horse), the high density altitude, and the tailwind.

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 - in flightGo-around (vfr)
Object - animal(s)Factor
Descent - excessivePilot in commandFactor
Directional control - not maintainedPilot in commandCause
Weather condition - high density altitudeFactor
Weather condition - tailwindFactor
Loss of control - on ground/waterLanding - flare/touchdown
Stall/mush - inadvertentPilot in commandFactor

Analysis

The pilot said that he was attempting to land in a pasture next to his home when he noticed a horse near the approach end. He elected to land long to avoid the horse but realized there was not enough pasture remaining. He attempted a go-around and added full power but could not arrest the sink rate. He decided to land the airplane in the remaining pasture. He landed with power in a nose high attitude at stall speed. The left wing struck the ground, causing the airplane to rotate 180 degrees to the left, and the right wingtip dragged along the ground. The pilot said he was not use to the extra weight of a full fuel load and carrying a rear seat passenger with a 5 knot tailwind. Density altitude at the time of the accident was calculated to be 7,741 feet mean seal level (msl).

Factual narrative

On October 26, 2005, approximately 1545 mountain standard time, a Piper PA-18-150, N4055Z, piloted by a private pilot, was substantially damaged when it ground looped during landing near Cortez Municipal Airport (CEZ), Cortez, Colorado. Visual meteorological conditions prevailed at the time of the accident. The personal flight was being conducted under the provisions of Title 14 CFR Part 91 without a flight plan. The pilot and passenger were not injured. The local flight originated from the pilot's private airstrip, near CEZ, approximately 1430.

According to a telephone interview with the pilot and the accident report he subsequently submitted, he was attempting to land at his home when he noticed a horse near the approach end of the runway. He elected to land long to avoid a horse but then realized insufficient runway remained. He attempted a go-around and added full power but could not arrest the sink rate. He decided to land the airplane on the runway remaining. He landed with power applied in a nose high attitude right at stall speed. The left wing struck the ground, causing the airplane to rotate 180 degrees to the left and dragging the right wingtip dragged along the ground. The pilot said he was unfamiliar with mountain flying conditions in Cortez, Colorado, (5,918 feet msl) as he had done most of his flying near sea level in Alaska. He said he had just filled the fuel tanks to capacity, and the extra weight of the fuel and the rear seat passenger made the airplane heavier than what he was accustom. He also said there was a 5 knot tailwind during the landing.

Postaccident examination disclosed a broken left wing spar. The right wingtip was scratched. Density altitude at the time of the accident was calculated to be 7,741 feet mean seal level (msl).

Aircraft

Registration
N4055Z
Reported as
Piper PA-18-150
Category
Airplane
Serial number
18-8060
Airframe hours
3,603
Engine
Lycoming O-320-A2A, 180 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
Martin M Lawrence
Airworthiness certificate
Standard, Utility
Last inspection
Annual · September 1, 2005 · 3 hours before
Departed
Cortez, CO
Destination
Cortez, CO

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 · 2

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
48
Injuries
None
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 2, With waivers/limitations
Last flight review
March 1, 2004
Seat
Front
Flight hours
1,400 total · 750 in this make and model · 1,300 as pilot in command · 50 in the last 90 days · 3 in the last 30 days
Role
Other flight crew
Age
75
Injuries
None
Certificate
Private
Airplane ratings
Single-engine sea, Single-engine land
Medical
Unknown, Unknown
Seat
Rear
Flight hours
310 total

Weather

Conditions
Visual (VMC) · Day
Wind
310° at 11 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
63 °F, dew point 39 °F
Altimeter
30.02 inHg
Observed at
CEZ

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 N4055Z · 2

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