# NTSB WPR22LA217: Cub Crafters CC19-215, N61KT, McCall, ID, June 9, 2022 - Type: NTSB accident investigation - Classification: Accident · No injuries · Class 3 · Limited · Final report - Date: June 9, 2022, 11:45 local (17:45 UTC) - Place: McCall, ID · airport environment - Coordinates: 44.888744, -116.10175 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=44.8887&lon=-116.1017&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: 2 uninjured - Status: Completed - Report: Approved by Office Director - Investigation class: Class 3 - NTSB office: Western Pacific Region - Parties: Federal Aviation Administration - NTSB case key (mKey): 105290 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR22LA217 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/105290/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=105290 - Page: https://openairdocs.org/ntsb/WPR22LA217 ## Probable cause A loss of directional control during the landing roll due to a fractured brake line fitting on the brake caliper. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Landing gear system: brake](https://openairdocs.org/ntsb-findings/01023242): Aircraft › Aircraft systems · Damaged/degraded (probable cause); cases with it: [Cub Crafters CC19-215, 1 case](https://openairdocs.org/ntsb-findings/01023242/cases.md?model=2470009), [All aircraft, 297 cases](https://openairdocs.org/ntsb-findings/01023242/cases.md) - [Performance/control parameters: directional control](https://openairdocs.org/ntsb-findings/01062020): Aircraft › Aircraft oper/perf/capability · Attain/maintain not possible (probable cause); cases with it: [Cub Crafters CC19-215, 2 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=2470009), [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: [Cub Crafters CC19-215, 1 case](https://openairdocs.org/ntsb-events/230/sequence.md?model=2470009), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) - [Landing-landing roll: Runway excursion](https://openairdocs.org/ntsb-events/300); cases with it: [Cub Crafters CC19-215, 1 case](https://openairdocs.org/ntsb-events/300/sequence.md?model=2470009), [All aircraft, 3,643 cases](https://openairdocs.org/ntsb-events/300/sequence.md) ## Analysis The pilot reported that he was attending a backcountry flying course and had conducted several off-airport landings on various backcountry airstrips prior to returning to the destination airport. During the landing roll, the left brake “flopped” under his foot with no pressure and the airplane veered to the right. The airplane exited the right side of the runway and traveled down an embankment, where the left wing and tail contacted the down-sloping terrain. Examination of the brake caliper and brake line components revealed that the brake line fitting had fracture separated. A contact mark was observed on the brake caliper aft of the fitting. Metallurgical examination of the fracture surfaces on the brake line fitting revealed that it had fractured due to overstress. It is likely that, while operating on an unimproved surface, the brake line fitting struck an object that fractured the fitting. The loss of functionality in the left brake caused the loss of directional control during the subsequent landing. ## Factual narrative On June 9, 2022, about 1145 mountain daylights time, a Cub Crafters, CC19-215, N61KT, was substantially damaged when it was involved in an accident near McCall, Idaho. The pilot and flight instructor were not injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 instructional flight. The pilot of a tailwheel airplane reported that, while attending a backcountry flying course, he had completed several off-airport landings with a flight instructor before returning to McCall Municipal Airport (KMYL), McCall, Idaho. During the landing roll to runway 34, while applying brakes, the left brake “flopped” under his foot with no pressure and the airplane veered to the right. The pilot was unable to maintain control of the airplane and it traveled off the side of the runway and down an embankment, where the left wing and tail contacted the down-sloping terrain. The pilot was then able to taxi the airplane back to the ramp. Postaccident examination by a Federal Aviation Administration inspector revealed that the left brake line near the caliper was separated and the left wing and elevator were substantially damaged. The brake caliper and brake line components from the left main landing gear were sent to National Transportation Safety Board Materials Laboratory, Washington, DC, for examination. The brake line 45° fitting at the lower side of the caliper was fractured. Examination of the fracture surface revealed characteristics consistent with a ductile overstress fracture. Additionally, a sliding contact mark was observed on the lower surface of the caliper aft of the fitting. The surface within the contact mark was smeared and exhibited a deformation pattern consistent with contacting an object moving forward relative to the brake caliper. An additional contact mark was also observed on the aft side of the fitting adjacent to the sliding contact mark on the caliper. ## Aircraft - Registration: [N61KT](https://openairdocs.org/aircraft/N61KT), registered now, S/N CC19-0058 (OpenAirDocs) - Reported make and model: CUB CRAFTERS INC CC19-215 - Registry model: [Cub Crafters CC19-215](https://openairdocs.org/model/cub-crafters-cc19-215) (registry code 2470009) (OpenAirDocs) - Category: Airplane - Serial number: CC19-0058 - Year built: 2021 - Airframe hours: 70 - Engines: Lycoming IO-390-D3B6 215 horsepower reciprocating - Damage: Substantial damage - Flight: Instructional, Part 91 - Registered owner: Fabric Flight LLC - Airworthiness certificate: Standard, Normal - Last inspection: July 21, 2021, 70 hours before - Destination: Same as departure - Airport: MYL, Mc Call Muni, runway 34, 6,101 × 75 ft, asphalt - Equipment: Stall warning system, ADS-B, Auto-pilot, Onboard weather ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 61; injuries: none; private; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 3, without waivers/limitations; last flight review April 10, 2022; seat: front; flight hours: 796 total, 70 in this make and model, 688 as pilot in command, 17.2 in the last 90 days, 9.2 in the last 30 days - Flight instructor; age 71; injuries: none; commercial, flight instructor, airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; seat: right ## Weather - Conditions: Visual (VMC), Day - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 65 °F - Altimeter: 30.07 inHg - Observed at: KMYL - METAR: KMYL 091951Z AUTO 18011KT 10SM BKN060 21/06 A3007 RMK AO2 SLP145 T02110061 ## 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 20220609009919A](https://openairdocs.org/incident/20220609009919A), Jun 9, 2022: Cub Crafters Inc CC19-215, Mccall, ID, Substantial damage. On 06/09/2022 at approximately 1145MNT, [privacy data omitted]landed at the Mccall id airport (kmyl) and veered off the right side of the runway into the grass… ## Docket (6 files) The files NTSB released with the investigation on August 30, 2023, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=105290. 5.7 MB in all. - Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 9 pages, 2.5 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=14669688&FileExtension=pdf&FileName=6120%20copy_Redacted-Rel.pdf - FAA record of conversation (item 2, PDF, 1 page, 71 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=15955884&FileExtension=pdf&FileName=Memo%20for%20Record%20FAA-Rel.pdf - Materials laboratory factual report 22-078 (item 3, PDF, 5 pages, 4 photos, 668 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=14588407&FileExtension=pdf&FileName=22-078-Rel.pdf - Photo array (item 4, PDF, 4 pages, 1.7 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=14778571&FileExtension=pdf&FileName=Photo%20Array-Rel.pdf - Release of aircraft wreckage, NTSB form 6120.15 (item 5, PDF, 1 page, 607 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=14798653&FileExtension=pdf&FileName=Wreckage%20Release_Redacted-Rel.pdf - Evidence control form (item 6, PDF, 2 pages, 170 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=14802933&FileExtension=pdf&FileName=Brake%20Cal%20Evidence%20Control%20form_Redacted-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.