CEN18LA095

NTSB accident investigation · Henderson Thorp T 18 · Troy, MO · February 8, 2018

Accident · Serious injuriesLimited investigationFinal report
Date
February 8, 2018, 11:52 local (17:52 UTC)
Place
Troy, MO
Injuries
1 serious
Damage
Substantial damage
Phase of flight
Approach
Aircraft
N600HHHenderson Thorp T 18
Defining event
Approach-VFR pattern final: Controlled flight into terr/obj (CFIT)
Weather
Visual (VMC) · Day
Status
Completed · report February 5, 2019
Report
Approved by Office Director
NTSB office
Central Region
Parties
Federal Aviation Administration
FAA report
20180208002119A
Case key
96720

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 adequate clearance from trees while landing in crosswind conditions.

Findings · 2

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: crosswind correctionAircraft › Aircraft oper/perf/capability · Not attained/maintainedHenderson THORP T-18: 1 caseAll aircraft: 184 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

During a personal flight, the private pilot reported that he made one pass over the runway, which was oriented east to west, and noted a crosswind from the southwest. During final approach, the pilot extended the flaps "one notch" to add "a little speed" to compensate for the crosswind. The pilot then looked down at the instrument panel to check the rate of descent; when he looked back outside, he saw a small tree limb near the airplane's right wing tip. The pilot made a left control input, but the right wing tip impacted the tree, and the airplane turned slightly to the right. The airplane impacted several other trees and then nosed down into the ground. The pilot reported no airplane mechanical malfunctions or failures.

Factual narrative

On February 8, 2018, at 1152 central standard time, an amateur-built T-18 airplane, N600HH, collided with trees and terrain during landing at Woodland Airstrip (MU89), Troy, Missouri. The private pilot, who was the sole occupant, sustained serious injuries and the airplane sustained substantial damage. The airplane was registered to and operated by the pilot under the provisions of 14 Code of Federal Regulations Part 91 as a personal flight. Visual meteorological conditions prevailed at the time of the accident and no flight plan had been filed. The flight departed Creve Coeur Airport (1H0), St. Louis, Missouri, about 1030. The pilot reported that upon arrival at MU89 he made one pass over runway 27 and noted a crosswind from 230° at 10 to 20 knots. The pilot continued into the traffic pattern for a full stop landing on runway 27. During final approach while aligned to the left side of the runway and about 90 mph, the pilot extended the flaps "one notch." The pilot added that he wanted a little speed due to the crosswind on final. The pilot looked down at the instrument panel to check the rate of descent and when he looked back outside he saw a small tree tip near the airplane's right wing tip. He initiated a left control input, but the right wing tip collided with the tree and the airplane turned slightly right. The airplane continued into several trees and then nosed down into the ground. The pilot reported that there were no airplane mechanical malfunctions or failures. The responding Federal Aviation Administration (FAA) inspector performed a postaccident examination of the airplane and accident site. There was evidence of broken tree limbs about 30 to 40 yards east of the main wreckage. The airplane came to rest next to a tree line in a nose low, vertical attitude (figure 1). Flight control continuity was confirmed and no preimpact anomalies were evident. Figure 1 – Accident airplane

Aircraft

Registration
N600HH
Reported as
Henderson Thorp T 18 (UNDESIGNAT)
Category
Airplane, amateur-built
Serial number
600
Built
1974
Airframe hours
682
Engine
Lycoming O-320, 150 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Condition · October 10, 2015
Departed
1H0 · St Louis, MO
Destination
1H0 · St Louis, MO
Airport
MU89 · Woodland Airstrip, runway 27, 1,750 × 80 ft, grass/turf
Equipment
Electronic primary flight display, Electronic multifunction display, ADS-B, Satellite tracking device, Handheld GPS, Onboard weather

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
75
Injuries
Serious
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, With waivers/limitations
Seat
Left
Restraint
4-point

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Lowest ceiling
None
Temperature
41 °F, dew point 19 °F
Altimeter
30.39 inHg
Observed at
KFYG, 20 nm away

Docket · 1

The files NTSB released with the investigation on March 28, 2018, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.7 MB 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.