# NTSB WPR22LA003: Interstate S-1A, N37317, Independence, OR, October 2, 2021 - Type: NTSB accident investigation - Classification: Accident · No injuries · Class 4 · Limited · Final report - Date: October 2, 2021, 08:10 local (15:10 UTC) - Place: Independence, OR · On the airport - Coordinates: 44.864351, -123.19761 - Nearby events: https://openairdocs.org/map.md?lat=44.8644&lon=-123.1976&mi=10 - Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping) - Defining event: [Takeoff: Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330) - 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: Federal Aviation Administration - NTSB case key (mKey): 104051 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR22LA003 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/104051/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=104051 - Page: https://openairdocs.org/ntsb/WPR22LA003 ## Probable cause The separation of the left rudder pedal interconnect cable during takeoff, which resulted in the student pilot’s inability to maintain directional control. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Flight control system: rudder control system](https://openairdocs.org/ntsb-findings/01022720): Aircraft › Aircraft systems · Failure (probable cause); cases with it: [Interstate S-1A, 1 case](https://openairdocs.org/ntsb-findings/01022720/cases.md?model=1850202), [All aircraft, 93 cases](https://openairdocs.org/ntsb-findings/01022720/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: [Interstate S-1A, 1 case](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=1850202), [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. - [Takeoff: Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330) (defining event); cases with it: [Interstate S-1A, 1 case](https://openairdocs.org/ntsb-events/330/sequence.md?model=1850202), [All aircraft, 994 cases](https://openairdocs.org/ntsb-events/330/sequence.md) - [Takeoff-rejected takeoff: Loss of control on ground](https://openairdocs.org/ntsb-events/230); cases with it: [Interstate S-1A, 2 cases](https://openairdocs.org/ntsb-events/230/sequence.md?model=1850202), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) - [Takeoff-rejected takeoff: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Interstate S-1A, 1 case](https://openairdocs.org/ntsb-events/470/sequence.md?model=1850202), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis The solo student pilot reported that, he was unable to maintain directional control of the tailwheel equipped airplane during the takeoff roll when he depressed the left rudder pedal. He aborted the takeoff and the airplane veered to the right, exited the right side of the runway, and impacted multiple airport signs, substantially damaging the right wing. Postaccident examination of the airplane by the owner revealed that, the control cable that interconnects the forward and aft seat left rudder pedals had failed. The owner further stated that it appeared the control cable had pulled through the nicopress swage and that the crimp marks were still visible on the swage. A review of the airplane maintenance records revealed that, the airplane amassed about 1,483.4 hours since the control cables were replaced about 21 years before the accident. ## Aircraft - Registration: [N37317](https://openairdocs.org/aircraft/N37317), registered now, S/N 160, built 1941 (OpenAirDocs) - Reported make and model: INTERSTATE S-1A - Registry model: [Interstate S-1A](https://openairdocs.org/model/interstate-s-1a) (registry code 1850202) (OpenAirDocs) - Registry engine: [Continental A&C65 series](https://openairdocs.org/engine/continental-a-c65-series) (registry code 17003, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 160 - Year built: 1941 - Airframe hours: 5770.7 - Engines: Continental Motors A65 65 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Jeannes Flying Service LLC - Registered owner: Jeannes Flying Service LLC - Airworthiness certificate: Standard, Normal - Last inspection: Annual, September 9, 2021 - Destination: Malino, OR - Airport: 7S5, Independence State, runway 34, 3,002 × 60 ft, asphalt - Equipment: None ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 57; injuries: none; student; medical: sport pilot; seat: front; restraint: lap only; flight hours: 83.5 total, 42.6 in this make and model ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 6 statute miles - Temperature: 43 °F, dew point 41 °F - Altimeter: 30.22 inHg - Observed at: KSLE, 9 nm away - METAR: KSLE 021456Z 00000KT 6SM R31/1600VP6000FT BR FEW002 06/05 A3022 RMK AO2 SLP234 T00610050 51004 ## Docket (6 files) The files NTSB released with the investigation on February 10, 2022, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=104051. 10.9 MB in all. - Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 7 pages, 2.6 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=13043952&FileExtension=pdf&FileName=6120_Redacted-Rel.pdf - Record of conversation - pilot (item 2, PDF, 1 page, 133 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=13042714&FileExtension=pdf&FileName=Record%20of%20Conversation%20pilot-Rel.pdf - Record of conversation - owner (item 3, PDF, 1 page, 132 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=13044061&FileExtension=pdf&FileName=Record%20of%20Conversation%20owner-Rel.pdf - Aircraft logbook entries (item 4, PDF, 2 pages, 6.5 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=13043913&FileExtension=pdf&FileName=logbooks_Redacted-Rel.pdf - Photo array (item 5, PDF, 4 pages, 4 photos, 1.4 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=13043699&FileExtension=pdf&FileName=photo%20array-Rel.pdf - Memorandum for record (item 6, PDF, 1 page, 106 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=13218589&FileExtension=pdf&FileName=Memo-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.