# NTSB WPR12LA430: Cessna 150F, N8130F, Snohomish, WA, September 17, 2012 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Limited investigation · Final report - Date: September 17, 2012, 10:30 local (17:30 UTC) - Place: Snohomish, WA - Coordinates: 47.904724, -122.1025 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=47.9047&lon=-122.1025&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing-landing roll: Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330) - Highest injury: Minor injuries - Injuries: 1 minor - Status: Completed, report June 11, 2014 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: FAA FSDO - NTSB case key (mKey): 85096 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR12LA430 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/85096/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=85096 - Page: https://openairdocs.org/ntsb/WPR12LA430 ## Probable cause The failure of the right wheel brake hydraulic line during the landing roll, which rendered the brake system inoperative. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Landing gear system: brake](https://openairdocs.org/ntsb-findings/01023242): Aircraft › Aircraft systems · Failure (probable cause); cases with it: [Cessna 150F, 1 case](https://openairdocs.org/ntsb-findings/01023242/cases.md?model=2071814), [All aircraft, 297 cases](https://openairdocs.org/ntsb-findings/01023242/cases.md) - [Landing gear system: brake](https://openairdocs.org/ntsb-findings/01023242): Aircraft › Aircraft systems · Damaged/degraded (probable cause); cases with it: [Cessna 150F, 1 case](https://openairdocs.org/ntsb-findings/01023242/cases.md?model=2071814), [All aircraft, 297 cases](https://openairdocs.org/ntsb-findings/01023242/cases.md) - [Fluids: hydraulic fluid](https://openairdocs.org/ntsb-findings/01071015): Aircraft › Fluids/misc hardware · Not specified; cases with it: [Cessna 150F, 1 case](https://openairdocs.org/ntsb-findings/01071015/cases.md?model=2071814), [All aircraft, 33 cases](https://openairdocs.org/ntsb-findings/01071015/cases.md) - [Performance/control parameters: directional control](https://openairdocs.org/ntsb-findings/01062020): Aircraft › Aircraft oper/perf/capability · Not specified; cases with it: [Cessna 150F, 14 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=2071814), [All aircraft, 3,958 cases](https://openairdocs.org/ntsb-findings/01062020/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: Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330) (defining event); cases with it: [Cessna 150F, 2 cases](https://openairdocs.org/ntsb-events/330/sequence.md?model=2071814), [All aircraft, 994 cases](https://openairdocs.org/ntsb-events/330/sequence.md) - [Landing-landing roll: Loss of control on ground](https://openairdocs.org/ntsb-events/230); cases with it: [Cessna 150F, 12 cases](https://openairdocs.org/ntsb-events/230/sequence.md?model=2071814), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) - [Landing-landing roll: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Cessna 150F, 39 cases](https://openairdocs.org/ntsb-events/470/sequence.md?model=2071814), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis The pilot reported that, when he applied wheel brakes during the landing roll, the airplane veered left. The airplane subsequently exited the runway and collided with a fence, which resulted in substantial damage to the right wing. Postaccident examination of the airplane's right brake assembly revealed two small cracks in the rigid portion of the hydraulic brake line. The cracks were seeping red fluid consistent with hydraulic fluid. The breach in the hydraulic brake line and loss of fluid likely resulted in a loss of hydraulic pressure, which rendered the brake system inoperative. ## Factual narrative On September 17, 2012, about 1030 Pacific daylight time, a Cessna 150F airplane, N8130F sustained substantial damage after it collided with a fence during the landing roll at Harvey Field Airport, Snohomish, Washington. The private pilot, the sole occupant of the airplane, sustained minor injuries. The airplane was registered to the pilot, and operated as a visual flight rules (VFR) cross-country flight under the provisions of 14 Code of Federal Regulations (CFR) Part 91. Visual meteorological conditions prevailed and no flight plan was filed for the flight that originated from Martin Field Airport, College Place, Washington, about 3 hours and 30 minutes before the accident. The pilot reported that when he applied wheel brakes during the landing roll the airplane veered left. The airplane exited the hard surfaced runway and collided with a fence. The pilot reported that after the accident he discovered a crack in the right brake hydraulic fluid line and that brake fluid was leaking from the crack. Postaccident examination of the airplane's right side brake assembly and associated brake line by representatives from National Transportation Safety Board and the Federal Aviation Administration, revealed 2 small cracks in the rigid portion of the hydraulic brake line. The cracks were about 1-inch below a clamp that attached the hydraulic brake line to the gear leg. Both cracks were seeping red fluid consistent with hydraulic fluid. The exam also revealed structural damage to the right wing spar. The pilot/operator failed to submit a Pilot/Operator Aircraft Accident Report (NTSB Form 6120.1/2). ## Aircraft - Registration: [N8130F](https://openairdocs.org/deregistered/N8130F-2017-05-03), registration cancelled 2017-05-03, S/N 15064230, built 1966 (OpenAirDocs) - Reported make and model: CESSNA 150F - Registry model: [Cessna 150F](https://openairdocs.org/model/cessna-150f) (registry code 2071814) (OpenAirDocs) - Registry engine: [Continental 0-200 series](https://openairdocs.org/engine/continental-0-200-series) (registry code 17020, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 15064230 - Engines: CONT MOTOR O-200 SERIES 100 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Stevenson Larry A - Registered owner: Stevenson Larry A - Airworthiness certificate: Standard, Utility - Departed: S95, College Place, WA - Destination: S43, Snohomish, WA - Flight plan: Unknown - Airport: S43, Harvey Field Airport, runway 15L, 2,671 × 36 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 75; injuries: minor; private; airplane ratings: single-engine land; medical: class 3, with waivers/limitations; seat: left; flight hours: 905 total, 300 in this make and model ## Weather - Conditions: Visual (VMC), Day - Wind: variable at 5 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 70 °F, dew point 46 °F - Altimeter: 30.12 inHg - Observed at: PAE, 5 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 20120917019009A](https://openairdocs.org/incident/20120917019009A), Sep 17, 2012: Cessna 150F, Snohomish, WA, Substantial damage. On 9/17/12, at approximatly 1040AM PDT, Cessna 150-F airplane, N8130F sustained structural damage during landing roll-out on RUNWAY15L at Harvey Field (S43),… ## Docket (1 files) The files NTSB released with the investigation on May 22, 2014, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=85096. 525 KB in all. - Brake Exam Report (item 1, .PDF, 525 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40401132&FileExtension=.PDF&FileName=Brake%20Exam%20Report%20-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.