# NTSB CEN23LA156: Boeing A75N1(PT17), N50142, Evansville, IN, April 13, 2023

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Class 4 · Limited · Final report
- Date: April 13, 2023, 10:45 UTC
- Place: Evansville, IN
- Coordinates: 38.043708, -87.534187
- Nearby events: https://openairdocs.org/map.md?lat=38.0437&lon=-87.5342&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Defining event: [Landing-landing roll: Loss of control on ground](https://openairdocs.org/ntsb-events/230)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- Investigation class: Class 4 - Basic report with no Prelim publish
- NTSB office: Central Region
- Parties: FAA
- NTSB case key (mKey): 107054
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN23LA156
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/107054/pdf
- NTSB docket: https://data.ntsb.gov/Docket?ProjectID=107054
- Page: https://openairdocs.org/ntsb/CEN23LA156

## Probable cause

The pilot’s failure to engage the tailwheel lock before landing which resulted in the loss of control and ground loop.

## Findings

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

- [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [Boeing A75N1(PT17), 33 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=1380134), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md)
- [Action: incomplete action](https://openairdocs.org/ntsb-findings/02041040): Personnel issues › Action/decision · Pilot (probable cause); cases with it: [Boeing A75N1(PT17), 1 case](https://openairdocs.org/ntsb-findings/02041040/cases.md?model=1380134), [All aircraft, 105 cases](https://openairdocs.org/ntsb-findings/02041040/cases.md)
- [Performance/control parameters: directional control](https://openairdocs.org/ntsb-findings/01062020): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Boeing A75N1(PT17), 27 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=1380134), [All aircraft, 3,958 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md)

## Sequence of events

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

- [Landing-landing roll: Loss of control on ground](https://openairdocs.org/ntsb-events/230) (defining event); cases with it: [Boeing A75N1(PT17), 32 cases](https://openairdocs.org/ntsb-events/230/sequence.md?model=1380134), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md)

## Analysis

The pilot reported that while performing a three-point landing on runway 18, during the roll out the airplane veered left, exited the runway to the left, and ground looped in the counter-clockwise direction. During the ground loop, the right wing struck the ground and the airplane came to rest upright on the main landing gear. The right aileron sustained substantial damage. After the accident sequence the pilot noted that the tailwheel lock was not fully in the locked position. The pilot was able to taxi the airplane to parking without further incident. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation.

## Aircraft

- Registration: [N50142](https://openairdocs.org/aircraft/N50142), registered now, S/N 75-962, built 1940 (OpenAirDocs)
- Reported make and model: BOEING A75N1(PT17)
- Registry model: [Boeing A75N1(PT17)](https://openairdocs.org/model/boeing-a75n1-pt17) (registry code 1380134) (OpenAirDocs)
- Registry engine: [Continental W670 series](https://openairdocs.org/engine/continental-w670-series) (registry code 17018, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 75-962
- Year built: 1940
- Airframe hours: 2682.2
- Engines: Continental W670-6N 220 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Evansville P-47 Foundation Inc
- Registered owner: Evansville P-47 Foundation Inc
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, September 3, 2022, 10.7 hours before
- Departed: 3EV, Evansville, IN
- Destination: EEV, Evansville, IN
- Airport: EVV, Evansville Rgnl, runway 18, 6,286 × 150 ft, asphalt
- Equipment: ADS-B, Handheld GPS

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 73; injuries: none; commercial; airplane ratings: multi-engine land, single-engine sea, single-engine land; instrument ratings: airplane; medical: basicmed; last flight review November 28, 2022; seat: rear; restraint: 3-point; flight hours: 5,070 total, 18 in this make and model, 5,062 as pilot in command, 20 in the last 90 days, 6 in the last 30 days, 0 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: calm
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 73 °F, dew point 39 °F
- Altimeter: 30.00 inHg
- Observed at: KEVV, 1 nm away
- METAR: KEVV 131554Z 10SM CLR 23/04 A3000 RMK AO2 SLP155 T02330044

## FAA reports on this event (1)

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

- [Incident 20230413004839I](https://openairdocs.org/incident/20230413004839I), Apr 13, 2023: Boeing A75N1(PT17), Evansville, IN, Minor damage. On 04/13/2023,the aircraft was on a landing roll-out and entered a ground loop. The aircraft exited the runway and the right aileron was damaged.

## Docket (2 files)

The files NTSB released with the investigation on June 7, 2023, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=107054. 5.9 MB in all.

- NTSB form 6120.1 (item 1, PDF, 9 pages, 3.8 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=15393634&FileExtension=pdf&FileName=NTSB%20Submitted%20Report%204.18.2023_Redacted-Rel.pdf
- Photos (item 2, PDF, 4 pages, 4 photos, 2.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=15392579&FileExtension=pdf&FileName=Docket%20Photos%20(CEN23LA156)-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.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.