# NTSB WPR12CA242: Grumman G-164A, N5291, Riverton, WY, June 3, 2012 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: June 3, 2012, 06:00 local (12:00 UTC) - Place: Riverton, WY - Coordinates: 43.123889, -108.323333 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=43.1239&lon=-108.3233&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: 1 uninjured - Status: Completed, report September 13, 2012 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: Casper FSFO - NTSB case key (mKey): 83830 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR12CA242 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/83830/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=83830 - Page: https://openairdocs.org/ntsb/WPR12CA242 ## Probable cause The pilot's loss of directional control during the landing roll and his deliberate application of excessive braking pressure, which resulted in a noseover. ## 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: [Grumman G-164A, 3 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=3952704), [All aircraft, 3,958 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md) - [Landing gear system: brake](https://openairdocs.org/ntsb-findings/01023242): Aircraft › Aircraft systems · Not specified (probable cause); cases with it: [Grumman G-164A, 1 case](https://openairdocs.org/ntsb-findings/01023242/cases.md?model=3952704), [All aircraft, 297 cases](https://openairdocs.org/ntsb-findings/01023242/cases.md) - [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [Grumman G-164A, 2 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=3952704), [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: [Grumman G-164A, 2 cases](https://openairdocs.org/ntsb-events/230/sequence.md?model=3952704), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) - [Landing-landing roll: Nose over/nose down](https://openairdocs.org/ntsb-events/096); cases with it: [Grumman G-164A, 11 cases](https://openairdocs.org/ntsb-events/096/sequence.md?model=3952704), [All aircraft, 2,287 cases](https://openairdocs.org/ntsb-events/096/sequence.md) ## Analysis The pilot, who was flying a tailwheel-equipped agricultural aerial application airplane, was landing on a dirt airstrip in order to take on a load of application chemical. After he landed on the main gear and lowered the tailwheel to the surface, the airplane started to veer toward the side of the runway. The pilot was unable to keep the airplane from departing the side of the runway, and, because it was heading toward a big gully, he applied as much braking force as possible. As he applied the braking force, the airplane nosed over onto its back, which resulted in substantial damage to the upper wing and the vertical stabilizer. According to the pilot, there was no malfunction or anomaly associated with the airplane's directional control system or its braking system. ## Factual narrative The pilot, who was flying a tail wheel equipped agricultural aerial application airplane, was landing on a dirt strip in order to take on a load of application chemical. After landing on the main gear and lowering the tail wheel to the surface, the airplane started to veer toward the side of the runway. The pilot was unable to keep the airplane from departing the side of the runway, and because it was heading toward a big gully, he applied as much braking force as he was able. As he applied the braking force, the airplane nosed over onto its back, resulting in substantial damage to the upper wing and the vertical stabilizer. According to the pilot, there was no malfunction or anomaly associated with the airplane's directional control systems or its braking system. ## Aircraft - Registration: [N5291](https://openairdocs.org/aircraft/N5291), registered now, S/N 572, built 1968 (OpenAirDocs) - Reported make and model: GRUMMAN G-164A - Registry model: [Grumman G-164A](https://openairdocs.org/model/grumman-g-164a) (registry code 3952704) (OpenAirDocs) - Registry engine: [Pratt & Whitney R-985 series](https://openairdocs.org/engine/pratt-whitney-r-985-series) (registry code 52008, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 572 - Engines: P&W R-985 SERIES 450 horsepower reciprocating - Damage: Substantial damage - Flight: Aerial application, Part 137 - Operator: Sky Aviation Corp, doing business as Aerial Application - Registered owner: Sky Aviation Corp - Airworthiness certificate: Special, Restricted (Special) - Departed: KRIW, Riveerton, WY - Destination: N/A, Riverton, WY - Airport: N/A, Hidden Valley Airport, runway 34, 4,000 × 55 ft, dirt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 28; injuries: none; commercial; airplane ratings: single-engine land; medical: class 2, without waivers/limitations; flight hours: 330 total, 23 in this make and model ## Weather - Conditions: Visual (VMC), Dawn - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 61 °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 20120603010199A](https://openairdocs.org/incident/20120603010199A), Jun 3, 2012: Grumman G-164A, Riverton, WY, Substantial damage. On 06/03/2012 at approximately 0600 MDT, N5291 a Grumman model G-164A aircraft sustained major damage while landing on a private airstrip near Riverton, WY.… ## Docket (2 files) The files NTSB released with the investigation on July 3, 2012, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=83830. 216 KB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 164 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40371070&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF - Record of Conversation (item 2, .PDF, 52 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40371071&FileExtension=.PDF&FileName=Record%20of%20Conversation-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.