# NTSB CEN19LA091: Van's RV-8, N737MC, Horseshoe Bay, TX, February 15, 2019

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Class 3 · Limited · Final report
- Date: February 15, 2019, 16:00 local (22:00 UTC)
- Place: Horseshoe Bay, TX
- Coordinates: 30.543056, -98.354446 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=30.5431&lon=-98.3544&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Defining event: [Takeoff: Loss of engine power (total)](https://openairdocs.org/ntsb-events/341)
- Highest injury: Serious injuries
- Injuries: 2 serious
- Status: Completed
- Report: Approved by Office Director
- Investigation class: Class 3
- NTSB office: Central Region
- Parties: FAA San Antonio FSDO
- NTSB case key (mKey): 99040
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN19LA091
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/99040/pdf
- NTSB docket: https://data.ntsb.gov/Docket?ProjectID=99040
- Page: https://openairdocs.org/ntsb/CEN19LA091

## Probable cause

A total loss of engine power for reasons that could not be determined based on the available information.

## Findings

NTSB's coded findings; those marked are part of the probable cause.

- [Engine (reciprocating)](https://openairdocs.org/ntsb-findings/01058500): Aircraft › Aircraft power plant · Unknown/Not determined (probable cause); cases with it: [Stewart David Patrick VANS RV8, 1 case](https://openairdocs.org/ntsb-findings/01058500/cases.md?model=05614J0), [All aircraft, 497 cases](https://openairdocs.org/ntsb-findings/01058500/cases.md)
- [Not determined](https://openairdocs.org/ntsb-findings/05000000): Not determined › Not determined · Unknown/Not determined (probable cause); cases with it: [Stewart David Patrick VANS RV8, 1 case](https://openairdocs.org/ntsb-findings/05000000/cases.md?model=05614J0), [All aircraft, 2,247 cases](https://openairdocs.org/ntsb-findings/05000000/cases.md)

## Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event best describes what happened.

- [Takeoff: Unknown or undetermined](https://openairdocs.org/ntsb-events/000); cases with it: [Stewart David Patrick VANS RV8, 1 case](https://openairdocs.org/ntsb-events/000/sequence.md?model=05614J0), [All aircraft, 1,703 cases](https://openairdocs.org/ntsb-events/000/sequence.md)
- [Takeoff: Loss of engine power (total)](https://openairdocs.org/ntsb-events/341) (defining event); cases with it: [Stewart David Patrick VANS RV8, 1 case](https://openairdocs.org/ntsb-events/341/sequence.md?model=05614J0), [All aircraft, 3,820 cases](https://openairdocs.org/ntsb-events/341/sequence.md)
- [Takeoff: Attempted remediation/recovery](https://openairdocs.org/ntsb-events/060); cases with it: [Stewart David Patrick VANS RV8, 1 case](https://openairdocs.org/ntsb-events/060/sequence.md?model=05614J0), [All aircraft, 1,422 cases](https://openairdocs.org/ntsb-events/060/sequence.md)
- [Takeoff: Collision during takeoff/land](https://openairdocs.org/ntsb-events/490); cases with it: [Stewart David Patrick VANS RV8, 1 case](https://openairdocs.org/ntsb-events/490/sequence.md?model=05614J0), [All aircraft, 1,309 cases](https://openairdocs.org/ntsb-events/490/sequence.md)

## Analysis

The pilot reported that he departed on the multi-leg flight with both tanks filled to capacity, for a total of 43 gallons. The airplane consumed 11 to 12 gallons of fuel during the first leg, then consumed another 11 during the second leg. Shortly after departing on the third leg of the flight, the engine lost total power. The pilot performed a forced landing, during which the airplane sustained substantial damage. Examination of the airplane revealed that both fuel tanks were breached during the accident; there was no fuel remaining in the tanks, nor was any evidence of fuel present at the site. There were no mechanical anomalies that would have precluded normal operation of the airplane or engine. A fuel flow indicating device displayed 17.8 gallons of fuel remaining and 23.2 gallons of fuel used. The unit depended on the pilot’s input of the fuel onboard before the beginning of the flight. Based on the pilot’s statement that the airplane’s fuel tanks contained full fuel before the initial takeoff and that the fuel flow device was programmed with the proper amount of fuel, the airplane should have had about 17 gallons of fuel remaining for the last leg of the flight. The reason for the loss of engine power could not be determined based on the available information.

## Factual narrative

On February 15, 2019, about 1600 central standard time, an experimental, amateur-built Vans RV-8, N737MC, was substantially damaged when it was involved in an accident near Horseshoe Bay, Texas. The airline transport pilot and passenger sustained serious injuries. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight. The pilot reported that the purpose of the flight was to travel to Northwest Regional Airport (52F), Roanoke, Texas, for lunch with friends. The airplane departed from Lakeway Airpark (3R9), Lakeway, Texas, with both tanks full of fuel, for a total of 43 gallons. The airplane consumed about "11-12" gallons of fuel on the leg to 52F. The pilot switched fuel tanks just before landing at 52F, and, when the airplane landed, he reported the fuel tank levels were "both about even" at 10 gallons based on the fuel gauges. The pilot reported that this indication was not quite accurate with the tailwheel on the ground, as the fuel gauges read about 1.5 to 2.5 gallons high from an inflight reading with the fuselage level. The pilot then departed 52F to Horseshoe Bay Resort Airport (DZB), Horseshoe Bay, Texas. The airplane consumed about 11 gallons of fuel during the flight. The pilot subsequently departed and, after reaching about 1,800 ft above mean sea level, the pilot adjusted the throttle for climb power. As the pilot reached for the fuel/air mixture control and fuel boost pump switch, the engine lost total power. The pilot performed a forced landing, during which the airplane sustained substantial damage to the fuselage, wings, and empennage. The passenger reported that about 30 to 40 seconds after takeoff, he heard a "chugging" sound from the engine and observed the propeller "turning less than normal." The passenger estimated that the airplane was less than 1,000 ft above ground level when the loss of engine power occurred. The passenger reported that the airplane "started to turn around," but then the pilot realized the airplane would not make it back to the airport. Several witnesses heard the engine "sputtering" after the takeoff. One witness, who was a pilot, saw the airplane "turn to the left" as if it attempted to return to the departure airport. A Federal Aviation Administration (FAA) inspector responded to the accident site to examine the airplane. The inspector reported there was no fuel present in the two breached fuel tanks, there were no signs of fuel on the ground at the accident site, and there were no signs of vegetation at the accident site affected by fuel. First responders reported that they did not notice fuel present at the accident site, nor was there a postimpact fire. A postaccident examination of the airframe and engine revealed no mechanical anomalies. A Shadin Fuel Flow Indicator was installed in the airplane. The unit, which displayed fuel quantity remaining based upon the pilot’s total fuel amount input prior to flight, powered on with a “GOOD” indicator showing. Theunit displayed 17.8 gallons of fuel remaining and 23.2 gallons of fuel used.

## Aircraft

- Registration: [N737MC](https://openairdocs.org/deregistered/N737MC-2019-07-30), registration cancelled 2019-07-30, S/N 81464, built 2002 (OpenAirDocs)
- Reported make and model: Van's Aircraft RV-8
- Registry model: [Stewart David Patrick VANS RV8](https://openairdocs.org/model/stewart-david-patrick-vans-rv8) (registry code 05614J0) (OpenAirDocs)
- Registry engine: [Lycoming IO-360-A1B6D](https://openairdocs.org/engine/lycoming-io-360-a1b6d) (registry code 41593, reciprocating) (OpenAirDocs)
- Category: Airplane, amateur-built
- Serial number: 81464
- Year built: 2002
- Airframe hours: 1600
- Engines: Lycoming Engines YIO-360-A1B6 200 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Airworthiness certificate: Special, Experimental (Special)
- Last inspection: Condition, April 24, 2018
- Departed: DZB, Horseshoe Bay, TX
- Destination: 3R9, Lakeway, TX
- Airport: DZB, Horseshoe Bay Resort, runway 35, 5,977 × 100 ft, asphalt
- Equipment: Data recorder

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 75; injuries: serious; airline transport; airplane ratings: multi-engine land, single-engine land, single-engine sea; instrument ratings: airplane; medical: class 2, with waivers/limitations; last flight review December 14, 2018; seat: front; restraint: 3-point; flight hours: 26,522 total, 1,545 in this make and model, 20,102 as pilot in command, 38 in the last 90 days, 14 in the last 30 days, 5 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 270° at 14 knots, gusting 21
- Temperature: 86 °F, dew point 46 °F
- Altimeter: 28.60 inHg
- Observed at: KDZB, 1 nm away

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 20190215022659A](https://openairdocs.org/incident/20190215022659A), Feb 15, 2019: Stewart David Patrick VANS RV8, Horseshoe Bay, TX, Destroyed. Aircraft departed Horseshoe Bay Airport. Approximately 3,000' aircraft engine began to sputter. Attempted to turn back to airport, decision to attempt an…

## Docket (6 files)

The files NTSB released with the investigation on September 7, 2021, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=99040. 22.7 MB in all.

- Accident photographs (item 1, PDF, 4 pages, 809 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=9823023&FileExtension=pdf&FileName=Accident%20Photographs-Rel.pdf
- Pilot/operator aircraft accident report, NTSB form 6120.1 (item 2, PDF, 9 pages, 15.7 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=9749707&FileExtension=pdf&FileName=NTSB%20Form%206120_1%20Redacted-Rel.pdf
- Various statements (item 3, PDF, 10 pages, 3.0 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=9746678&FileExtension=pdf&FileName=Various%20Statements%20Redacted-Rel.pdf
- FAA record of conversation (item 4, PDF, 1 page, 91 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=9749605&FileExtension=pdf&FileName=FAA%20ROC-Rel.pdf
- Examination summary (item 5, PDF, 2 pages, 26 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=11651535&FileExtension=pdf&FileName=Examination%20Summary-Rel.pdf
- Examination photographs (item 6, PDF, 7 pages, 3.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=11660262&FileExtension=pdf&FileName=Examination%20Photographs-Rel.pdf

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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