ERA20CA307

NTSB accident investigation · Cessna 170 · Morrisville, VT · September 3, 2020

Accident · Serious injuriesClass 4 · Data collectionFinal report
Date
September 3, 2020, 11:21 local (15:21 UTC)
Place
Morrisville, VT
Injuries
1 serious, 2 uninjured
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N170JSCessna 170
Defining event
Takeoff: Loss of control on ground
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
Investigation class
Class 4 - Basic report with no Prelim publish
NTSB office
Eastern Region Aviation
Parties
Textron Aviation, FAA/FSDO
FAA report
20200903017769A
Case key
101916

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 and subsequent exceedance of the airplane's critical angle of attack during takeoff, which resulted in an aerodynamic stall and collision with terrain.

Findings · 3

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.

Use of equip/info: aircraft controlPersonnel issues › Task performance · PilotCessna 170A: 33 casesAll aircraft: 9,295 casesProbable cause
Performance/control parameters: directional controlAircraft › Aircraft oper/perf/capability · Not attained/maintainedCessna 170A: 23 casesAll aircraft: 3,958 casesProbable cause
Performance/control parameters: angle of attackAircraft › Aircraft oper/perf/capability · Capability exceededCessna 170A: 2 casesAll aircraft: 990 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

According to the right seat pilot/owner of the tailwheel-equipped airplane, she was demonstrating a short field takeoff to the passenger on a grass area adjacent to the airport’s single paved runway. After adding power and releasing the brakes, the airplane veered to the left toward a ditch between the grass area and the paved runway. The pilot attempted to steer away from the ditch by applying rudder control inputs but was unsuccessful. As the airplane approached the ditch she elected to rotate. The airplane briefly became airborne then stalled and impacted terrain. The pilot and the passenger were seriously injured and the airplane’s fuselage and both wings were substantially damaged. The pilot reported that there were no preimpact mechanical failures or malfunctions with the airplane that would have precluded normal operation.

Aircraft

Registration
N170JS
Reported as
Cessna 170 (A)
Category
Airplane
Serial number
19546
Built
1950
Airframe hours
5,720
Engine
Lycoming O-360-A1A, 180 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Normal
Last inspection
Annual · October 14, 2019
Airport
MVL · Morrisville-Stowe State, runway 01, 3,700 × 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
56
Injuries
Serious
Certificate
Private
Airplane ratings
Single-engine land, Single-engine sea
Instrument ratings
Airplane
Medical
Class 3, With waivers/limitations
Seat
Right
Restraint
4-point
Flight hours
2,200 total · 1,400 in this make and model · 2,200 as pilot in command · 55.8 in the last 90 days · 12.7 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Lowest ceiling
2,900 ft broken
Temperature
66 °F, dew point 61 °F
Altimeter
29.84 inHg
Observed at
KMVL

Docket · 5

The files NTSB released with the investigation on April 22, 2021, on NTSB’s docket system: statements, records, photos and specialists’ reports. 11.4 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.