CHI08CA261

NTSB accident investigation · Ntbk Wag Aero Sport · Oxford, IA · August 21, 2008

Accident · Minor injuriesData collectionFinal report
Date
August 20, 2008, 20:15 local (Aug 21, 2008, 01:15 UTC)
Place
Oxford, IA
Injuries
1 minor
Damage
Substantial damage
Phase of flight
Approach
Aircraft
N141STNtbk Wag Aero Sport
Defining event
Approach-VFR pattern final: Collision during takeoff/land
Weather
Visual (VMC) · Dusk
Status
Completed · report September 26, 2008
Report
Approved by Office Director
Parties
DSM FSDO
FAA report
20080820847839A
Case key
68913

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 misjudged his approach path which resulted in insufficient altitude and the subsequent failure to maintain clearance with the trees. Contributing to the accident were the trees and the dusk lighting conditions.

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.

Light condition: low lightEnvironmental issues › Conditions/weather/phenomena · Contributed to outcomeNtbk WAG-AERO SPORT TRAIN: 1 caseAll aircraft: 36 casesProbable cause
Performance/control parameters: descent/approach/glide pathAircraft › Aircraft oper/perf/capability · Not attained/maintainedNtbk WAG-AERO SPORT TRAIN: 1 caseAll aircraft: 809 casesProbable cause
Object/animal/substance: tree(s)Environmental issues › Physical environment · Contributed to outcomeNtbk WAG-AERO SPORT TRAIN: 1 caseAll aircraft: 933 casesProbable cause
Performance/control parameters: altitudeAircraft › Aircraft oper/perf/capability · Not attained/maintainedNtbk WAG-AERO SPORT TRAIN: 1 caseAll aircraft: 1,310 casesProbable cause

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 pilot reported that the total runway length is 4,800 feet, the northern 1,400 feet of which is grass and the southern 2,400 feet is asphalt. He reported that he was practicing touch and go landings on the grass portion of the runway when the accident occurred. The pilot reported that he made three touch and go landings, and decided to make one more before it got too dark. He stated that the final approach descent path appeared to be above the low-lying trees. He stated that he did not realize he was too low until he felt a "sharp blow" to the airplane and the airplane rotated to the right descending to the ground. The pilot reported that he should have realized that "...landing as close to the trees as I intended was unsafe" when the runway lights came on while he was on final approach.

Factual narrative

On August 20, 2008, at 2015 central daylight time, an amateur built NTBK LLC Wag Aero Sport Trainer, N141ST, collided with the scrub trees while landing on runway 15 at the Green Castle Airport, a private airstrip, in Oxford, Iowa. The private pilot received minor injuries. The airplane sustained substantial damage to the wings and firewall. The personal flight was operating under Title 14 Code of Federal Regulations Part 91. Visual meteorological conditions prevailed and no flight plan was filed. The local flight originated from the Green Castle Airport at 1940. The pilot reported the total runway length is 4,800 feet, the northern 1,400 feet of which is grass and the southern 2,400 feet is asphalt. He reported he was practicing touch and go landings on the grass portion of the runway when the accident occurred. The pilot reported he made three touch and go landings, and decided to make one more before it got too dark. He stated that the final approach descent path appeared to be above the low-lying trees. He stated that he did not realize he was too low until he felt a "sharp blow" to the airplane and the airplane rotated to the right descending to the ground. The pilot reported that he should have realized that "...landing as close to the trees as I intended was unsafe" when the runway lights came on while he was on final approach.

Aircraft

Registration
N141ST
Reported as
Ntbk Wag Aero Sport
Category
Airplane, amateur-built
Serial number
ST-001-08
Engine
Lycoming O-290-D2, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
James H. Beeghly
Registered owner
Ntbk LLC
Airworthiness certificate
Special, Experimental (Special)
Departed
IA24 · Oxford, IA
Destination
IA24 · Oxford, IA
Airport
IA24 · Green Castle, runway 15

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
58
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, With waivers/limitations
Flight hours
204 total · 3 in this make and model · 140 as pilot in command · 6 in the last 90 days · 3 in the last 30 days

Weather

Conditions
Visual (VMC) · Dusk

FAA reports on this event · 1

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