# NTSB WPR10CA394: Cessna 170, N179MM, Salt Lake City, UT, August 9, 2010 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Data collection · Final report - Date: August 9, 2010, 17:36 local (23:36 UTC) - Place: Salt Lake City, UT - Coordinates: 40.622222, -111.993331 - Nearby events: https://openairdocs.org/map.md?lat=40.6222&lon=-111.9933&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: Minor injuries - Injuries: 1 minor, 1 uninjured - Status: Completed, report December 20, 2010 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: Federal Aviation Administration - NTSB case key (mKey): 76922 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR10CA394 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/76922/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=76922 - Page: https://openairdocs.org/ntsb/WPR10CA394 ## Probable cause The pilot’s failure to maintain aircraft control during the landing roll. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · 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) - [Alertness/Fatigue](https://openairdocs.org/ntsb-findings/02013500): Personnel issues › Physical · Pilot (probable cause); cases with it: [Cessna 170A, 1 case](https://openairdocs.org/ntsb-findings/02013500/cases.md?model=2072304), [All aircraft, 48 cases](https://openairdocs.org/ntsb-findings/02013500/cases.md) - [Wind](https://openairdocs.org/ntsb-findings/03034000): Environmental issues › Conditions/weather/phenomena · Contributed to outcome; cases with it: [Cessna 170A, 2 cases](https://openairdocs.org/ntsb-findings/03034000/cases.md?model=2072304), [All aircraft, 110 cases](https://openairdocs.org/ntsb-findings/03034000/cases.md) - [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) ## 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: Landing gear collapse](https://openairdocs.org/ntsb-events/094); cases with it: [Cessna 170A, 11 cases](https://openairdocs.org/ntsb-events/094/sequence.md?model=2072304), [All aircraft, 1,787 cases](https://openairdocs.org/ntsb-events/094/sequence.md) ## Analysis The pilot reported that he started his cross country flight in the tailwheel-equipped airplane in San Antonio, Texas with two rest stops in Roswell and Farmington, New Mexico. When landing to stop for a third time, the pilot checked the airport's automated weather, which indicated a “quartering right crosswind” of about 8 knots. The approach and landing were uneventful. During the landing roll a gust of wind struck the airplane and the airplane initiated a right turn. Despite the pilot’s control inputs the airplane ground looped, collapsing the left main landing gear and substantially damaging the left wing, fuselage and empennage. The pilot reported no mechanical failures or malfunctions with the airframe or engine prior to the accident. The accident airport’s automated weather observation system reported at the time of the accident, wind was from 240 at 13 knots. The pilot’s total flight time for the day was approximately 8.5 hours. ## Factual narrative The pilot reported that he started his cross country flight in the tailwheel-equipped airplane in San Antonio, Texas with two rest stops in Roswell and Farmington, New Mexico. When landing to stop for a third time, the pilot checked the airport's automated weather, which indicated a “quartering right crosswind” of about 8 knots. The approach and landing were uneventful. During the landing roll a gust of wind struck the airplane and the airplane initiated a right turn. Despite the pilot’s control inputs the airplane ground looped, collapsing the left main landing gear and substantially damaging the left wing, fuselage and empennage. The pilot reported no mechanical failures or malfunctions with the airframe or engine prior to the accident. The accident airport’s automated weather observation system reported at the time of the accident, wind was from 240 at 13 knots. The pilot’s total flight time for the day was approximately 8.5 hours. ## Aircraft - Registration: [N179MM](https://openairdocs.org/aircraft/N179MM), registered now, S/N 19423 (OpenAirDocs) - Reported make and model: CESSNA 170 (A) - 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: 19423 - Airframe hours: 3570 - Engines: Lycoming O-360 series 180 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Harold G. Jensen - Registered owner: Harold G. Jensen - Airworthiness certificate: Standard, Normal; Standard, Utility - Last inspection: Annual, May 1, 2010, 35 hours before - Departed: KFMN, Farmington, NM - Destination: KU42, Salt Lake City, UT - Airport: KU42, South Valley Regional Airport, runway 16, 5,860 × 100 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 69; injuries: none; commercial, flight instructor; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 3, with waivers/limitations; last flight review April 5, 2010; seat: left; flight hours: 3,500 total, 35 in this make and model, 3,400 as pilot in command, 80 in the last 90 days, 40 in the last 30 days, 9 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 240° at 13 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 82 °F, dew point 36 °F - Altimeter: 30.00 inHg - Observed at: KU42 ## 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 20100809040419A](https://openairdocs.org/incident/20100809040419A), Aug 9, 2010: Cessna 170A, West Jordan, UT, Substantial damage. The pilot was operating in accordance with 14 CFR 91 day VFR. He and his wife, the only passenger, departed their home base in san antonio, TX, 53T, and U42… ## Docket (1 files) The files NTSB released with the investigation on September 16, 2010, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=76922. 424 KB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 424 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40335226&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.