# NTSB WPR11CA355: Cessna 170A, N9741A, Mulino, OR, July 30, 2011 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: July 30, 2011, 11:00 local (18:00 UTC) - Place: Mulino, OR - Coordinates: 45.216388, -122.590278 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=45.2164&lon=-122.5903&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: 3 uninjured - Status: Completed, report October 17, 2011 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: Federal Aviation Administration - NTSB case key (mKey): 81295 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR11CA355 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/81295/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=81295 - Page: https://openairdocs.org/ntsb/WPR11CA355 ## Probable cause The certified flight instructor's inadequate oversight of his student, and delayed recovery efforts following the student's loss of directional control during landing rollout. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Performance/control parameters: directional control](https://openairdocs.org/ntsb-findings/01062020): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Cessna 170A, 23 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=2072304), [All aircraft, 3,958 cases](https://openairdocs.org/ntsb-findings/01062020/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 170A, 33 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=2072304), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md) - [Attention/monitoring: monitoring other person](https://openairdocs.org/ntsb-findings/02021535): Personnel issues › Psychological · Instructor/check pilot (probable cause); cases with it: [Cessna 170A, 1 case](https://openairdocs.org/ntsb-findings/02021535/cases.md?model=2072304), [All aircraft, 200 cases](https://openairdocs.org/ntsb-findings/02021535/cases.md) - [Action: delayed action](https://openairdocs.org/ntsb-findings/02041025): Personnel issues › Action/decision · Instructor/check pilot (probable cause); cases with it: [Cessna 170A, 3 cases](https://openairdocs.org/ntsb-findings/02041025/cases.md?model=2072304), [All aircraft, 894 cases](https://openairdocs.org/ntsb-findings/02041025/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 170A, 33 cases](https://openairdocs.org/ntsb-events/230/sequence.md?model=2072304), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) - [Landing-landing roll: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Cessna 170A, 11 cases](https://openairdocs.org/ntsb-events/470/sequence.md?model=2072304), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis The certified flight instructor (CFI) reported that the purpose of the flight was, in part, to provide the private pilot with recurrent training in furtherance of obtaining a flight review. The student was not current. Following performance of basic airwork in the conventional gear airplane, the CFI asked the student to perform a wheel landing. The CFI said that the student’s landing was successfully performed, but during rollout he exhibited a directional control deficiency. The airplane veered right during rollout on the subsequent landing, and the student attempted to regain directional control. The CFI reported that, due to his lengthy personal relationship with the student, he delayed acquiring control of the airplane. By the time he took the controls, it was too late to avoid the impending ground loop. As the airplane came to a stop on the runway’s gravel shoulder, the left main landing gear separated from the gear box, and the left wing broke. ## Factual narrative The certified flight instructor (CFI) reported that the purpose of the flight was, in part, to provide the private pilot with recurrent training in furtherance of obtaining a flight review. The student was not current. Following performance of basic airwork in the conventional gear airplane, the CFI asked the student to perform a wheel landing. The CFI said that the student’s landing was successfully performed, but during rollout he exhibited a directional control deficiency. The airplane veered right during rollout on the subsequent landing, and the student attempted to regain directional control. The CFI reported that, due to his lengthy personal relationship with the student, he delayed acquiring control of the airplane. By the time he took the controls, it was too late to avoid the impending ground loop. As the airplane came to a stop on the runway’s gravel shoulder, the left main landing gear separated from the gear box, and the left wing broke. ## Aircraft - Registration: [N9741A](https://openairdocs.org/aircraft/N9741A), registered now, S/N 19406, built 1950 (OpenAirDocs) - Reported make and model: CESSNA 170A - Registry model: [Cessna 170A](https://openairdocs.org/model/cessna-170a) (registry code 2072304) (OpenAirDocs) - Registry engine: [Continental C145 series](https://openairdocs.org/engine/continental-c145-series) (registry code 17012, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 19406 - Airframe hours: 3771 - Engines: CONT MOTOR C145 SERIES 145 horsepower reciprocating - Damage: Substantial damage - Flight: Instructional, Part 91 - Operator: James Greene - Registered owner: Michelle A. Helzer - Airworthiness certificate: Standard, Normal - Last inspection: Annual, July 11, 2011, 2 hours before - Departed: 7S9, Hubbard, OR - Destination: 4S9, Mulino, OR - Airport: 4S9, Mulino State, runway 32, 3,425 × 100 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Flight instructor; age 58; injuries: none; commercial, flight instructor; airplane ratings: single-engine land, single-engine sea; instrument ratings: airplane; medical: class 2, with waivers/limitations; last flight review March 17, 2011; seat: right; flight hours: 2,758 total, 10 in this make and model, 2,694 as pilot in command, 58 in the last 90 days - Pilot; injuries: none; seat: left ## Weather - Conditions: Visual (VMC), Day - Wind: 340° at 5 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 64 °F ## 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 20110730015829A](https://openairdocs.org/incident/20110730015829A), Jul 30, 2011: Cessna 170A, Mulino, OR, Substantial damage. N9741A ground looped on landing practice. Tore the left main gear from the aircraft and damaged the left wing. ## Docket (1 files) The files NTSB released with the investigation on September 13, 2011, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=81295. 335 KB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 335 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40353465&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.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.