# NTSB GAA19CA261: Siai-Marchetti SM, N772DW, Belgrade, MT, May 13, 2019 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: May 13, 2019, 12:00 local (18:00 UTC) - Place: Belgrade, MT - Coordinates: 45.783889, -111.160835 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=45.7839&lon=-111.1608&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing: Loss of control on ground](https://openairdocs.org/ntsb-events/230) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report March 3, 2020 - Report: Approved by Office Director - NTSB office: General Aviation Accidents - Parties: FAA - NTSB case key (mKey): 99421 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=GAA19CA261 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/99421/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=99421 - Page: https://openairdocs.org/ntsb/GAA19CA261 ## Probable cause The pilot receiving instruction's overapplication of rudder during the landing roll and his subsequent failure to maintain directional control, which resulted in a ground loop. ## 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: [Siai-Marchetti SM 1019, 1 case](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=8121215), [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: [Siai-Marchetti SM 1019, 2 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=8121215), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md) - [Action: incorrect action performance](https://openairdocs.org/ntsb-findings/02041015): Personnel issues › Action/decision · Student/instructed pilot; cases with it: [Siai-Marchetti SM 1019, 1 case](https://openairdocs.org/ntsb-findings/02041015/cases.md?model=8121215), [All aircraft, 1,386 cases](https://openairdocs.org/ntsb-findings/02041015/cases.md) - [Wind: tailwind](https://openairdocs.org/ntsb-findings/03034015): Environmental issues › Conditions/weather/phenomena · Effect on operation; cases with it: [Siai-Marchetti SM 1019, 1 case](https://openairdocs.org/ntsb-findings/03034015/cases.md?model=8121215), [All aircraft, 594 cases](https://openairdocs.org/ntsb-findings/03034015/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Landing: Loss of control on ground](https://openairdocs.org/ntsb-events/230) (defining event); cases with it: [Siai-Marchetti SM 1019, 2 cases](https://openairdocs.org/ntsb-events/230/sequence.md?model=8121215), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) - [Landing: Attempted remediation/recovery](https://openairdocs.org/ntsb-events/060); cases with it: [Siai-Marchetti SM 1019, 2 cases](https://openairdocs.org/ntsb-events/060/sequence.md?model=8121215), [All aircraft, 1,422 cases](https://openairdocs.org/ntsb-events/060/sequence.md) - [Landing: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Siai-Marchetti SM 1019, 2 cases](https://openairdocs.org/ntsb-events/470/sequence.md?model=8121215), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) - [Landing: Nose over/nose down](https://openairdocs.org/ntsb-events/096); cases with it: [Siai-Marchetti SM 1019, 2 cases](https://openairdocs.org/ntsb-events/096/sequence.md?model=8121215), [All aircraft, 2,287 cases](https://openairdocs.org/ntsb-events/096/sequence.md) ## Analysis The flight instructor in the tailwheel-equipped airplane reported that, while the pilot receiving instruction performed a wheel landing, the touchdown was smooth and normal. The pilot reduced the power to idle, the tailwheel lowered, and the airspeed decelerated to about 30 knots. He added that the airplane turned slightly right and that the pilot corrected with "slightly too much left rudder," followed by "too much right rudder," which led to a ground loop. The instructor attempted to recover with heavy left rudder and decided to perform a go-around. He attempted to add power, but he was unable to advance the power lever, which he believed the pilot was holding firmly. The left wing impacted the runway, and airplane nosed over. The airplane sustained substantial damage to the left wing. The instructor reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation. ## Factual narrative The flight instructor in the tailwheel-equipped airplane reported that, while the pilot receiving instruction performed a wheel landing, the touchdown was smooth and normal. The pilot reduced the power to idle, the tailwheel lowered, and the airspeed decelerated to about 30 knots. The airplane turned slightly to the right and the pilot corrected with "slightly too much left rudder", followed by "too much right rudder", which led to a ground loop to the right. The instructor attempted to recover with heavy left rudder and decided to perform a go around. He attempted to add power, but was unable to advance the power lever, which he believes was being firmly held by the pilot. The left wing impacted the runway and airplane tipped onto its nose, The airplane sustained substantial damage to the left wing. The flight instructor reported that there were no preaccident mechanical failures or malfunctions with the airplane that would have precluded normal operation. The airport's automated weather observation station reported that, about 4 minutes before the accident, the wind was from 330° at 7 knots. The pilot landed the airplane on runway 12. ## Aircraft - Registration: [N772DW](https://openairdocs.org/aircraft/N772DW), registered now, S/N 007, built 1976 (OpenAirDocs) - Reported make and model: Siai-Marchetti SM (1019) - Registry model: [Siai-Marchetti SM 1019](https://openairdocs.org/model/siai-marchetti-sm-1019) (registry code 8121215) (OpenAirDocs) - Registry engine: [Allison 250 series](https://openairdocs.org/engine/allison-250-series) (registry code 03014, turbo-prop) (OpenAirDocs) - Category: Airplane - Serial number: 007 - Year built: 1976 - Airframe hours: 1983 - Engines: Allison 250-B15G 317 horsepower turbo prop - Damage: Substantial damage - Flight: Instructional, Part 91 - Airworthiness certificate: Special, Experimental (Special) - Last inspection: Condition, October 24, 2018 - Departed: 7S1, Twin Bridges, MT - Destination: BZN, Belgrade, MT - Airport: BZN, Bozeman Yellowstone Intl, runway 12, 8,994 × 150 ft, asphalt - Equipment: Handheld GPS, ADS-B, Angle of attack indicator ## Flight crew As NTSB recorded them. NTSB leaves out names. - Flight instructor; age 26; injuries: none; flight instructor, commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, without waivers/limitations; last flight review July 8, 2017; seat: rear; restraint: 4-point; flight hours: 1,274 total, 83 in this make and model, 1,233 as pilot in command, 49 in the last 90 days, 29 in the last 30 days, 4 in the last 24 hours - Pilot; age 41; injuries: none; private; airplane ratings: single-engine land; instrument ratings: airplane; last flight review August 10, 2017; seat: front; restraint: 4-point; flight hours: 331 total, 30 in this make and model, 197 as pilot in command, 31 in the last 90 days, 18 in the last 30 days, 3 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 330° at 7 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 70 °F, dew point 36 °F - Altimeter: 29.89 inHg - Observed at: KBZN ## 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 20190513004579A](https://openairdocs.org/incident/20190513004579A), May 13, 2019: Siai-Marchetti SM 1019, Belgrade, MT, Substantial damage. On may 5, 2019, at 1150 MST, a Siai- Marchetti model SM1019, N772DW, operated by the owner with his instructor, building time for insurance minimums. They… ## Docket (3 files) The files NTSB released with the investigation on June 5, 2019, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=99421. 3.9 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 3.6 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40473272&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Master.PDF - Pilot's Statement (item 2, .PDF, 127 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40473273&FileExtension=.PDF&FileName=Pilot%27s%20Statement-Master.PDF - Accident Photo (item 3, .PDF, 1 photo, 171 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40473274&FileExtension=.PDF&FileName=Accident%20Photo-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.