# NTSB WPR12CA427: Boeing A75N1(PT17), N4777V, Lincoln, CA, September 19, 2012 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: September 18, 2012, 17:00 local (Sep 19, 2012, 00:00 UTC) - Place: Lincoln, CA - Coordinates: 38.909168, -121.351387 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=38.9092&lon=-121.3514&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 December 19, 2012 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: Federal Aviation Administration - NTSB case key (mKey): 85090 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR12CA427 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/85090/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=85090 - Page: https://openairdocs.org/ntsb/WPR12CA427 ## Probable cause The pilot's failure to maintain directional control during the landing roll, 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: [Boeing A75N1(PT17), 27 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=1380134), [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 · Pilot (probable cause); cases with it: [Boeing A75N1(PT17), 33 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=1380134), [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: [Boeing A75N1(PT17), 32 cases](https://openairdocs.org/ntsb-events/230/sequence.md?model=1380134), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) ## Analysis The pilot stated that while landing, the airplane started diverting to the right. He corrected with full left rudder, but the airplane did not respond. He then applied full left brake, which caused an over correction. The airplane ground looped to the left, and the right lower wing contacted the runway, damaging the lower right wing spar. The pilot stated that the airplane and engine had no mechanical failures or malfunctions that would have precluded normal operations. ## Factual narrative The pilot stated that while landing, the airplane started diverting to the right. He corrected with full left rudder, but the airplane did not respond. He then applied full left brake, which caused an over correction. The airplane ground looped to the left, and the right lower wing contacted the runway, damaging the lower right wing spar. The pilot stated that the airplane and engine had no mechanical failures or malfunctions that would have precluded normal operations. ## Aircraft - Registration: [N4777V](https://openairdocs.org/aircraft/N4777V), registered now, S/N 75-5733 (OpenAirDocs) - Reported make and model: BOEING A75N1(PT17) - Registry model: [Boeing A75N1(PT17)](https://openairdocs.org/model/boeing-a75n1-pt17) (registry code 1380134) (OpenAirDocs) - Registry engine: [Amateur-built UNKNOWN ENG](https://openairdocs.org/engine/amateur-built-unknown-eng) (registry code 99999) (OpenAirDocs) - Category: Airplane - Serial number: 75-5733 - Airframe hours: 2142 - Engines: Lycoming R-680-17 reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Judd Donald C - Registered owner: Judd Donald C - Airworthiness certificate: Standard, Normal - Last inspection: Annual, June 21, 2012 - Departed: O61, Cameron Park, CA - Destination: KLHM, Lincoln, CA - Flight plan: Unknown - Airport: KLHM, Lincoln Regional Airport, runway 33, 6,000 × 100 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 62; commercial, flight instructor; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; seat: rear; flight hours: 1,657 total, 395 in this make and model ## Weather - Conditions: Visual (VMC), Day - Wind: 315° at 5 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 88 °F, dew point 45 °F - Altimeter: 29.94 inHg - Observed at: KLHM ## 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 20120918021829A](https://openairdocs.org/incident/20120918021829A), Sep 18, 2012: Boeing A75N1/PT-13D, Lincoln, CA, Substantial damage. At approximately 1700 PDT on September 18, 2012, privately registered aircraft N4777V (B-75-A75N1 PT-13D) was on a VFR flight from cameron airpark (KO61) in… ## Other investigations on N4777V (1) 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. - [NTSB WPR24LA015](https://openairdocs.org/ntsb/WPR24LA015), Oct 12, 2023: Boeing A75N1(PT17) (N4777V), Mesa, AZ, substantial damage. Probable cause: The flight instructor’s failure to maintain directional control during the landing roll, which resulted in a ground loop. ## Docket (1 files) The files NTSB released with the investigation on October 12, 2012, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=85090. 487 KB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 487 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40378569&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.