# NTSB ANC15CA016: Cessna 170B, N4582C, Wasilla, AK, March 31, 2015 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: March 30, 2015, 18:00 local (Mar 31, 2015, 02:00 UTC) - Place: Wasilla, AK - Coordinates: 61.395278, -149.840835 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=61.3953&lon=-149.8408&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 July 8, 2015 - Report: Approved by Office Director - NTSB office: Alaska Regional Office - Parties: Federal Aviation Administration - NTSB case key (mKey): 90965 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC15CA016 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/90965/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=90965 - Page: https://openairdocs.org/ntsb/ANC15CA016 ## Probable cause The flight instructor's inadequate supervision of the student while landing, which resulted in a ground loop. Contributing to the accident was the student pilots failure to maintain directional control of the tailwheel-equipped airplane during the landing roll. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Attention/monitoring: task monitoring/vigilance](https://openairdocs.org/ntsb-findings/02021520): Personnel issues › Psychological · Instructor/check pilot (probable cause); cases with it: [Cessna 170B, 4 cases](https://openairdocs.org/ntsb-findings/02021520/cases.md?model=2072306), [All aircraft, 330 cases](https://openairdocs.org/ntsb-findings/02021520/cases.md) - [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Student/instructed pilot (probable cause); cases with it: [Cessna 170B, 91 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=2072306), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/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: [Cessna 170B, 84 cases](https://openairdocs.org/ntsb-events/230/sequence.md?model=2072306), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) - [Landing-landing roll: Dragged wing/rotor/float/other](https://openairdocs.org/ntsb-events/093); cases with it: [Cessna 170B, 3 cases](https://openairdocs.org/ntsb-events/093/sequence.md?model=2072306), [All aircraft, 319 cases](https://openairdocs.org/ntsb-events/093/sequence.md) - [Landing-landing roll: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Cessna 170B, 52 cases](https://openairdocs.org/ntsb-events/470/sequence.md?model=2072306), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis The flight instructor and student pilot were practicing landings in a tailwheel-equipped airplane. The flight instructor stated that on the fifth landing, during the landing roll, the airplane began to drift slightly to the right, and the student pilot inadvertently applied right rudder. In an effort to correct for the right turn, the flight instructor immediately applied full left rudder and brake while simultaneously pulling aft on the control yoke, but the airplane ground looped. During the ground loop the airplane sustained substantial damage to the left wing and left aileron. ## Factual narrative The flight instructor and student pilot were practicing landings in a tailwheel-equipped airplane. The flight instructor stated that on the fifth landing, during the landing roll, the airplane began to drift slightly to the right, and the student pilot inadvertently applied right rudder. In an effort to correct for the right turn, the flight instructor immediately applied full left rudder and brake while simultaneously pulling aft on the control yoke, but the airplane ground looped. During the ground loop the airplane sustained substantial damage to the left wing and left aileron. ## Aircraft - Registration: [N4582C](https://openairdocs.org/aircraft/N4582C), registered now, S/N 25526, built 1953 (OpenAirDocs) - Reported make and model: CESSNA 170B (UNDESIGNAT) - Registry model: [Cessna 170B](https://openairdocs.org/model/cessna-170b) (registry code 2072306) (OpenAirDocs) - Registry engine: [Continental C145 series](https://openairdocs.org/engine/continental-c145-series) (registry code 17012, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 25526 - Year built: 1953 - Engines: Lycoming O-360 180 horsepower reciprocating - Damage: Substantial damage - Flight: Instructional, Part 91 - Operator: Rocheleau Kenneth Raney - Registered owner: Rocheleau Kenneth Raney - Airworthiness certificate: Standard, Normal - Last inspection: Annual, August 11, 2014 - Departed: PAMR, Anchorage, AK - Destination: Z40, Wasilla, AK - Airport: Z40, Goose Bay, runway 24, 3,000 × 75 ft, gravel - Equipment: Handheld GPS ## Flight crew As NTSB recorded them. NTSB leaves out names. - Flight instructor; age 49; injuries: none; flight instructor, commercial; airplane ratings: single-engine land, single-engine sea; instrument ratings: airplane; medical: class 3, without waivers/limitations; last flight review August 13, 2013; seat: right; restraint: 3-point; flight hours: 4,600 total, 500 in this make and model, 4,550 as pilot in command, 55.2 in the last 90 days, 19.5 in the last 30 days, 1.5 in the last 24 hours - Student pilot; age 34; injuries: none; student; medical: class 3, without waivers/limitations; seat: left; restraint: 3-point; flight hours: 15 total, 15 in this make and model, 15 in the last 90 days, 15 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 43 °F, dew point 30 °F - Altimeter: 29.57 inHg - Observed at: BCV, 11 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 20150331005159A](https://openairdocs.org/incident/20150331005159A), Mar 31, 2015: Cessna 170B, Anchorage, AK, Substantial damage. Accident occurred at goose bay (Z40) during instructional flight. Due to pilot error, a ground loop occurred during landing rollout. It appears that weather… ## Docket (1 files) The files NTSB released with the investigation on June 22, 2015, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=90965. 1.5 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 1.5 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40428235&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Master.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.