# NTSB WPR21LA229: Maule M-4, N4718T, Cascade, ID, June 2, 2021 - Type: NTSB accident investigation - Classification: Accident · No injuries · Class 4 · Limited · Final report - Date: June 2, 2021, 10:05 local (16:05 UTC) - Place: Cascade, ID · Mahoney Creek USFS Airport - Coordinates: 44.744583, -114.92138 - Nearby events: https://openairdocs.org/map.md?lat=44.7446&lon=-114.9214&mi=10 - Phase of flight: [Taxi](https://openairdocs.org/ntsb-phases/250) (OpenAirDocs' grouping) - Defining event: [Taxi-from runway: 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: Western Pacific Region - Parties: FAA - NTSB case key (mKey): 103272 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR21LA229 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/103272/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=103272 - Page: https://openairdocs.org/ntsb/WPR21LA229 ## Probable cause The pilot’s failure to maintain clearance from a ditch, which resulted in impact with terrain. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Attention/monitoring: monitoring environment](https://openairdocs.org/ntsb-findings/02021545): Personnel issues › Psychological · Pilot (probable cause); cases with it: [Maule M-4, 1 case](https://openairdocs.org/ntsb-findings/02021545/cases.md?model=5460104), [All aircraft, 809 cases](https://openairdocs.org/ntsb-findings/02021545/cases.md) - [Terrain: sloped/uneven terrain](https://openairdocs.org/ntsb-findings/03021017): Environmental issues › Physical environment · Effect on equipment (probable cause); cases with it: [Maule M-4, 1 case](https://openairdocs.org/ntsb-findings/03021017/cases.md?model=5460104), [All aircraft, 270 cases](https://openairdocs.org/ntsb-findings/03021017/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Taxi-from runway: Loss of control on ground](https://openairdocs.org/ntsb-events/230) (defining event); cases with it: [Maule M-4, 2 cases](https://openairdocs.org/ntsb-events/230/sequence.md?model=5460104), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) ## Analysis The pilot of the tailwheel-equipped airplane reported that, after landing, and during taxi to the end of the runway to turn around to park, he did not see a deep steep ditch at the end of the runway. The airplane traveled into the ditch as the pilot applied full right rudder and full right brake in an attempt to turn, however, the airplane continued to slide into the ditch where the left-wing impact terrain. The airplane sustained substantial damage to the left wing. The pilot reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation. ## Aircraft - Registration: [N4718T](https://openairdocs.org/aircraft/N4718T), registered now, S/N 61, built 1964 (OpenAirDocs) - Reported make and model: MAULE M-4 - Registry model: [Maule M-4](https://openairdocs.org/model/maule-m-4) (registry code 5460104) (OpenAirDocs) - Registry engine: [Continental 0-300 series](https://openairdocs.org/engine/continental-0-300-series) (registry code 17022, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 61 - Year built: 1964 - Airframe hours: 2750.9 - Engines: Continental O-300-A 145 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: David R Arcand - Registered owner: David R Arcand - Airworthiness certificate: Standard, Normal - Last inspection: Annual, October 1, 2020, 31 hours before - Departed: 85U, Soldier Bar, ID - Destination: Same as departure - Airport: 0U3, Mahoney Creek Usfs, runway 04, 2,150 × 15 ft, dirt - Equipment: Unknown ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 73; injuries: none; private; airplane ratings: single-engine land; medical: class 3, with waivers/limitations; last flight review May 17, 2021; flight hours: 1,045 total, 615 in this make and model, 977 as pilot in command, 24.4 in the last 90 days, 24.4 in the last 30 days, 3.7 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 60° at 3 knots - Visibility: 10 statute miles - Temperature: 70 °F, dew point 43 °F - Altimeter: 30.12 inHg - Observed at: KLLJ, 33 nm away - METAR: METAR KLLJ 021555Z AUTO 06003KT 10SM CLR 21/06 A3012 RMK AO2 SLP136 T02060061= ## 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 20210602007529A](https://openairdocs.org/incident/20210602007529A), Jun 2, 2021: Maule M-4, Cascade, ID, Substantial damage. Pilot indicated he landed at Mahoney Creek air strip without mishap, on runway 04 and taxied back taking pictures. When reaching the end of the runway, he… ## Docket (2 files) The files NTSB released with the investigation on July 26, 2021, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=103272. 31.6 MB in all. - Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 9 pages, 30.4 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=12421535&FileExtension=pdf&FileName=WPR21LA229%20Pilot%206120_Redacted-Rel.pdf - Accident photos (item 2, PDF, 2 pages, 1.2 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=12402051&FileExtension=pdf&FileName=Accident%20photos-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.