# NTSB WPR11CA065: Aviat A-1B, N55HU, North Bend, WA, November 28, 2010 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: November 28, 2010, 15:00 local (23:00 UTC) - Place: North Bend, WA - Coordinates: 47.390556, -121.535278 - Nearby events: https://openairdocs.org/map.md?lat=47.3906&lon=-121.5353&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing-landing roll: Nose over/nose down](https://openairdocs.org/ntsb-events/096) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report December 20, 2010 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: Seattle FSDO - NTSB case key (mKey): 77888 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR11CA065 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/77888/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=77888 - Page: https://openairdocs.org/ntsb/WPR11CA065 ## Probable cause The pilot's failure to predetermine the depth of the snow on the runway. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Aircraft capability](https://openairdocs.org/ntsb-findings/01061000): Aircraft › Aircraft oper/perf/capability · Capability exceeded (probable cause); cases with it: [Aviat A-1B, 2 cases](https://openairdocs.org/ntsb-findings/01061000/cases.md?model=2210406), [All aircraft, 57 cases](https://openairdocs.org/ntsb-findings/01061000/cases.md) - [Planning/preparation](https://openairdocs.org/ntsb-findings/02061000): Personnel issues › Task performance · Pilot (probable cause); cases with it: [Aviat A-1B, 3 cases](https://openairdocs.org/ntsb-findings/02061000/cases.md?model=2210406), [All aircraft, 113 cases](https://openairdocs.org/ntsb-findings/02061000/cases.md) - [Terrain: snowy/icy terrain](https://openairdocs.org/ntsb-findings/03021030): Environmental issues › Physical environment · Contributed to outcome; cases with it: [Aviat A-1B, 1 case](https://openairdocs.org/ntsb-findings/03021030/cases.md?model=2210406), [All aircraft, 77 cases](https://openairdocs.org/ntsb-findings/03021030/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: Nose over/nose down](https://openairdocs.org/ntsb-events/096) (defining event); cases with it: [Aviat A-1B, 19 cases](https://openairdocs.org/ntsb-events/096/sequence.md?model=2210406), [All aircraft, 2,287 cases](https://openairdocs.org/ntsb-events/096/sequence.md) ## Analysis The pilot reported that during a local area personal proficiency flight, he decided to make a full-stop landing on the snow-covered runway of a remote state airstrip. Although he overflew the strip before landing, because he had not predetermined the actual depth of the snow on the surface, during the landing roll the airplane sunk deep enough into the snow that it decelerated at a rate that resulted in it nosing over onto its back. The pilot did not report any airplane malfunctions or anomalies, and he further stated that the accident could have been prevented if he had not landed without first acquiring an "exact verification" of the snow depth on the runway surface. ## Factual narrative The pilot reported that during a local area personal proficiency flight, he decided to make a full-stop landing on the snow-covered runway of a remote state airstrip. Although he overflew the strip before landing, because he had not predetermined the actual depth of the snow on the surface, during the landing roll the airplane sunk deep enough into the snow that it decelerated at a rate that resulted in it nosing over onto its back. The pilot did not report any airplane malfunctions or anomalies, and he further stated that the accident could have been prevented if he had not landed without first acquiring an "exact verification" of the snow depth on the runway surface. ## Aircraft - Registration: [N55HU](https://openairdocs.org/aircraft/N55HU), registered now, S/N 2046, built 1999 (OpenAirDocs) - Reported make and model: AVIAT AIRCRAFT INC A-1B - Registry model: [Aviat A-1B](https://openairdocs.org/model/aviat-a-1b) (registry code 2210406) (OpenAirDocs) - Registry engine: [Lycoming O&VO-360 series](https://openairdocs.org/engine/lycoming-o-vo-360-series) (registry code 41514, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 2046 - Engines: LYCOMING O&VO-360 SER 180 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Robert Londo - Registered owner: Kaihai Corp - Airworthiness certificate: Standard, Normal - Departed: Everett, WA - Destination: Everett, WA - Airport: 4W0, Bandera State, runway 08, 2,344 × 200 ft, snow ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 53; injuries: none; private; airplane ratings: single-engine land; medical: class 2, without waivers/limitations; flight hours: 2,774 total, 867 in this make and model ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 10 statute miles - Lowest ceiling: 1,500 ft overcast - Temperature: 37 °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 20101128051169A](https://openairdocs.org/incident/20101128051169A), Nov 28, 2010: Aviat Aircr A-1B, North Bend, WA, Substantial damage. On Sunday nov 28, 2010, at approximatly 14:30 pilot flying aircraft N55HU, a husky A-1B, attemped to land at Bandera State air field, North Bend, Washington.… ## Other investigations on N55HU (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 WPR22LA212](https://openairdocs.org/ntsb/WPR22LA212), Jun 10, 2022: Aviat A-1B (N55HU), Big Creek, ID, substantial damage. Probable cause: The pilot's failure to maintain directional control of the airplane during takeoff, which resulted in a runway excursion and collision with fencing. ## Docket (1 files) The files NTSB released with the investigation on December 16, 2010, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=77888. 304 KB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 304 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40340892&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.