ERA20LA069

NTSB accident investigation · Glassair I · Mount Sterling, KY · January 6, 2020

Accident · Serious injuriesClass 3 · LimitedFinal report
Date
January 6, 2020, 17:24 local (22:24 UTC)
Place
Mount Sterling, KY
Injuries
1 serious
Damage
Substantial damage
Phase of flight
Approach
Aircraft
N118CVGlassair I
Defining event
Approach-VFR pattern downwind: Fuel starvation
Weather
Visual (VMC) · Dusk
Status
Completed
Report
Approved by Office Director
Investigation class
Class 3
NTSB office
Eastern Region Aviation
Parties
FAA/FSDO
FAA report
20200106000229A
Case key
100775

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 mismanagement of the fuel selector, which resulted in fuel starvation and a total loss of engine power.

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.

Fluids: fuelAircraft › Fluids/misc hardware · Fluid managementGancar William G GLASAIR 1 RG: 1 caseAll aircraft: 1,695 casesProbable cause
Object/animal/substance: tree(s)Environmental issues › Physical environment · Contributed to outcomeGancar William G GLASAIR 1 RG: 1 caseAll aircraft: 933 cases

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 departed his home airport, remained in the traffic pattern and performed "several" touch-and-go landings, flew about 20 miles to a nearby airport, returned to his home airport, and performed another takeoff. Shortly after takeoff, the engine stopped producing power while the propeller continued to "windmill." The pilot said that he rotated the fuel selector from the "main tank" to the "header tank" position and that he turned the electric fuel boost pump on, but engine power was not restored. The airplane struck trees and terrain during the forced landing and sustained substantial damage, and the pilot was seriously injured. Examination of the airplane after the accident revealed that the two main and the header fuel tanks were compromised by impact, but continuity was confirmed through the entire fuel system with compressed air. The fuel selector was in the “Off” position and was immobilized in that position by impact damage. The pilot reported no deficiencies with the performance and handling of the airplane before the loss of engine power, and a postaccident engine run on the airframe revealed the engine started immediately, accelerated smoothly, and ran continuously without interruption. The pilot reported the airplane’s header tank contained 9 gallons of fuel and that the airplane averaged a fuel consumption rate of 8 gallons per hour. Based on the capacity of the header tank, the airplane’s fuel consumption rate, the as-found position of the fuel selector, and the successful postaccident engine run, it is likely the pilot inadvertently conducted the entire accident flight with the header tank selected, exhausted its fuel supply, then rotated the selector to the “Off” position after the engine lost power.

Factual narrative

On January 6, 2020, at 1724 eastern standard time, an experimental amateur-built Glassair I RG, N118CV, was destroyed when it was involved in an accident near Mount Sterling, Kentucky. The private pilot was seriously injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight. The pilot said that, after takeoff from Mount Sterling-Montgomery Airport (IOB), Mount Sterling, Kentucky, he remained in the traffic pattern and performed "several" touch-and-go landings. He then departed the pattern, flew about 20 miles to a nearby airport, landed, and departed for the return flight to IOB, where he landed to a full stop, taxied back, and performed another takeoff. Shortly after takeoff, the engine stopped producing power while the propeller continued to "windmill." The pilot said that he rotated the fuel selector from the "main tank" to the "header tank" position where he left it and that he turned the electric fuel boost pump on, but engine power was not restored. The pilot further described that he was sure that he had positioned the selector in the header tank position prior to the accident and added that he had to "raise the gate" before moving the selector. The pilot maneuvered the airplane back toward IOB but struck trees and terrain before the airplane came to rest in an abandoned highway rest stop area. The pilot reported that there were no deficiencies with the performance and handling of the airplane other than the loss of engine power. According to the airplane’s maintenance records, the airplane had flown 0.8 hour since its most recent condition inspection. According to the owner, the airplane's average fuel consumption rate in cruise flight was 8 gallons per hour. Postaccident examination of the wreckage at the accident site revealed that both wings and the structure beneath the engine and cockpit area were destroyed by impact. The cockpit, canopy, cabin, empennage, and tail sections all appeared intact. The fuel selector was found in the "Off" position and could not be rotated by hand where the airplane came to rest. The two main fuel tanks were voided by impact, and the 9-gallon header tank was ruptured beneath the pickup line and contained no fuel. The fuel system was damaged by impact, but continuity of the system was confirmed from the main tanks and the header tank through the fuel selector both visually and with compressed air. The gascolator and fuel screens were inspected, and they were clear and absent of debris. The airplane was placed on jacks and suspended by an engine hoist. Due to impact damage, all three propeller blades were cut to matching lengths. Fuel was plumbed to the carburetor from an external tank and a substitute switch was used in lieu of the impact-damaged ignition switch. An engine start was attempted, and the engine started immediately, accelerated smoothly, and ran continuously without interruption until stopped with the ignition switch. The engine was restarted and amagneto check confirmed operation of both magnetos.

Aircraft

Registration
N118CV
Reported as
Glassair I (RG)
Category
Airplane, amateur-built
Serial number
255
Built
2008
Airframe hours
405.9
Engine
Superior XPO-320-B1AC2, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Condition · January 3, 2020 · 1 hours before
Departed
IOB · Mount Sterling, KY
Airport
IOB · Mount Sterling-Montgomery Coun, runway 03, 5,000 × 75 ft, asphalt
Equipment
Electronic multifunction display, Electronic primary flight display

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
69
Injuries
Serious
Certificate
Private
Airplane ratings
Single-engine land
Medical
BasicMed
Seat
Left
Restraint
4-point
Flight hours
591 total · 361.7 in this make and model

Weather

Conditions
Visual (VMC) · Dusk
Wind
Calm
Visibility
10 statute miles
Lowest ceiling
None
Temperature
41 °F, dew point 30 °F
Altimeter
30.22 inHg
Observed at
KIOB, 1 nm away

Docket · 5

The files NTSB released with the investigation on August 10, 2021, on NTSB’s docket system: statements, records, photos and specialists’ reports. 3.2 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.