# NTSB ANC13CA101: Cessna 170B, N2736C, Iliamna, AK, September 14, 2013 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: September 13, 2013, 20:00 local (Sep 14, 2013, 04:00 UTC) - Place: Iliamna, AK - Coordinates: 59.440834, -156.534164 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=59.4408&lon=-156.5342&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: 2 uninjured - Status: Completed, report December 2, 2013 - Report: Approved by Office Director - NTSB office: Alaska Regional Office - Parties: FAA/FSDO - NTSB case key (mKey): 88053 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC13CA101 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/88053/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=88053 - Page: https://openairdocs.org/ntsb/ANC13CA101 ## Probable cause The pilot's inadvertent encounter with a mound while landing on a remote airstrip. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Terrain: rough terrain](https://openairdocs.org/ntsb-findings/03021015): Environmental issues › Physical environment · Effect on operation (probable cause); cases with it: [Cessna 170B, 4 cases](https://openairdocs.org/ntsb-findings/03021015/cases.md?model=2072306), [All aircraft, 442 cases](https://openairdocs.org/ntsb-findings/03021015/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: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Cessna 170B, 52 cases](https://openairdocs.org/ntsb-events/470/sequence.md?model=2072306), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) - [Landing-landing roll: Nose over/nose down](https://openairdocs.org/ntsb-events/096) (defining event); cases with it: [Cessna 170B, 29 cases](https://openairdocs.org/ntsb-events/096/sequence.md?model=2072306), [All aircraft, 2,287 cases](https://openairdocs.org/ntsb-events/096/sequence.md) ## Analysis The pilot of a tailwheel-equipped airplane reported that he was landing on a remote airstrip. During the landing roll, a gust of wind forced the airplane slightly right of centerline about midfield. The right main landing gear then contacted an approximate 30-degree upsloping hummock (mound). The right main tire burst and the right main wheel imbedded in the mound. The airplane subsequently pivoted forward and left, with the left wing contacting the ground, before coming to rest upright. The impact resulted in substantial damage to the left wing. The pilot added that with the exception of the right main tire burst, there were no mechanical malfunctions or failures of the airplane. ## Factual narrative The pilot of a tailwheel-equipped airplane reported that he was landing on a remote airstrip. During the landing roll, a gust of wind forced the airplane slightly right of centerline about midfield. The right main landing gear then contacted an approximate 30-degree upsloping hummock (mound). The right main tire burst and the right main wheel imbedded in the mound. The airplane subsequently pivoted forward and left, with the left wing contacting the ground, before coming to rest upright. The impact resulted in substantial damage to the left wing. The pilot added that with the exception of the right main tire burst, there were no mechanical malfunctions or failures of the airplane. ## Aircraft - Registration: [N2736C](https://openairdocs.org/deregistered/N2736C-2018-03-02), registration cancelled 2018-03-02, S/N 26280, built 1954 (OpenAirDocs) - Reported make and model: CESSNA 170B - Registry model: [Cessna 170B](https://openairdocs.org/model/cessna-170b) (registry code 2072306) (OpenAirDocs) - Registry engine: [Franklin 6A-350SER](https://openairdocs.org/engine/franklin-6a-350ser) (registry code 27023, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 26280 - Year built: 1954 - Airframe hours: 3872 - Engines: FRANKLIN 6A-350-C1 220 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Poirier Dennis L - Registered owner: Poirier Dennis L - Airworthiness certificate: Standard, Normal - Last inspection: Annual, April 20, 2013, 32 hours before - Departed: Iliamna, AK - Destination: Iliamna, AK - Equipment: Stall warning system ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 53; injuries: none; private; airplane ratings: single-engine land; medical: class 3, without waivers/limitations; seat: left; restraint: 3-point; flight hours: 892 total, 608 in this make and model, 862 as pilot in command, 30 in the last 90 days, 15 in the last 30 days, 4 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 100° at 11 knots - Visibility: 10 statute miles - Lowest ceiling: 2,700 ft broken - Temperature: 52 °F, dew point 48 °F - Altimeter: 29.75 inHg - Observed at: ILI, 53 nm away ## 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 20130913019089A](https://openairdocs.org/incident/20130913019089A), Sep 13, 2013: Cessna 170B, New Stuyahok, AK, Substantial damage. 09-11-13, The PIC and 1 passenger (pax) departed lake hood strip (Z41) in anchorage (anc), AK, bound for iliamna (ili). Acft was fueled in anc and topped off… ## Docket (2 files) The files NTSB released with the investigation on November 20, 2013, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=88053. 492 KB in all. - Weather Report (item 1, .PDF, 17 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40403486&FileExtension=.PDF&FileName=Weather%20Report-Master.PDF - Photograph # 1: Left Wing Damage (item 2, .PDF, 476 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40403482&FileExtension=.PDF&FileName=Photograph%20%23%201%3A%20%20Left%20Wing%20Damage-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.