# NTSB CEN12LA176: Aviat A-1C-200, N45TT, Bowling Green, OH, February 19, 2012 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: February 19, 2012, 13:15 local (18:15 UTC) - Place: Bowling Green, OH - Coordinates: 41.391109, -83.630279 - Nearby events: https://openairdocs.org/map.md?lat=41.3911&lon=-83.6303&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 October 29, 2013 - Report: Approved by Office Director - NTSB office: Central Region - Parties: FAA-Cleveland FSDO - NTSB case key (mKey): 83006 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN12LA176 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/83006/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=83006 - Page: https://openairdocs.org/ntsb/CEN12LA176 ## Probable cause The pilot’s failure to maintain directional control during landing. ## 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: [Aviat A-1C-200, 9 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=2210411), [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: [Aviat A-1C-200, 10 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=2210411), [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: [Aviat A-1C-200, 9 cases](https://openairdocs.org/ntsb-events/230/sequence.md?model=2210411), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md) - [Landing-landing roll: Runway excursion](https://openairdocs.org/ntsb-events/300); cases with it: [Aviat A-1C-200, 2 cases](https://openairdocs.org/ntsb-events/300/sequence.md?model=2210411), [All aircraft, 3,643 cases](https://openairdocs.org/ntsb-events/300/sequence.md) ## Analysis The pilot reported that upon landing, the airplane veered as if the left brake was locked and the airplane exited the runway, incurring substantial damage to the left wing. The pilot also reported that after the accident, when the left brake caliper assembly was disassembled, a metal shaving was found in the bleed valve port. The non-ferrous metal shaving appeared to be the remnant of drilling operations as evidenced by its spiral shape. There was no flattening of the spiral shape that would indicate that the shaving had become jammed between the caliper piston and its bore. Examination of the brake caliper revealed no malfunctions or failures that would have precluded normal operation. Based on the lack of available evidence that the brake had become locked, it is likely that the loss of directional control was for non-mechanical reasons. ## Factual narrative On February 19, 2012, about 1315 eastern standard time, an Aviat Aircraft, model A-1C-200, N45TT, was substantially damaged when it exited the right side of runway 10 during landing at the Wood County Airport (1G0), Bowling Green, Ohio. The pilot and pilot rated passenger were not injured. The aircraft was registered to Differential Leasing, LLC and operated by the airline transport pilot under the provisions of 14 Code of Federal Regulations Part 91 as a personal flight. Visual meteorological conditions prevailed for the flight, which was not on a flight plan. The local flight originated at 1300. The pilot reported to Federal Aviation Administration (FAA) Inspectors and to the NTSB investigator-in-charge that the left brake locked during landing and caused the airplane to veer to the side. Examination of the airplane by FAA inspectors revealed damage to the left wing and wing spar. Additional damage was noted to the left landing gear and propeller. No anomalies were detected by the inspectors, however, the airplane owner reported to FAA inspectors that he disassembled the left brake and found metal shavings within the port where the brake bleeder was attached. The left brake caliper assembly, along with the recovered metal shavings, were sent to the National Transportation Safety Board investigator for examination. The left brake assembly was a disk brake type caliper that had two independent pistons. The brake caliper and metal shavings were examined using a 10X magnifier. The piston bores within the main body of the caliper were clean with no evidence of scoring of the piston bores. The pistons each had circumferential abrasions on the outside of their bodies consistent with the pistons having been misaligned with the piston bores at some point. The O-ring seals appeared intact with no deficiencies noted. With the O-rings removed, the pistons were placed in their bores and were free to move. The previously mentioned abrasions, although visible, did not impede the movement of the pistons in either direction. The brake pads appeared intact and did not appear to have excessive wear. The metal shavings were not attracted to a magnet, which indicated that they were non-ferrous. The spiral appearance of the shavings was consistent with that of shavings expelled during drilling operations. The shavings still had a spiral shape and did not appear flattened. The lack of flattening of the spiral shavings indicated that they had not become jammed in between the piston and the piston bore. The examination of the brake assembly revealed no anomalies that would have precluded normal operation. The recorded weather conditions at the Toledo Executive Airport, about 12 miles northeast of the accident site, included wind from 20 degrees at 10 knots. ## Aircraft - Registration: [N45TT](https://openairdocs.org/aircraft/N45TT), registered now, S/N 3081, built 2010 (OpenAirDocs) - Reported make and model: AVIAT AIRCRAFT INC A-1C-200 - Registry model: [Aviat A-1C-200](https://openairdocs.org/model/aviat-a-1c-200) (registry code 2210411) (OpenAirDocs) - Registry engine: [Lycoming IO-360-A1D6D](https://openairdocs.org/engine/lycoming-io-360-a1d6d) (registry code 41823, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 3081 - Airframe hours: 111 - Engines: LYCOMING IO-360-A1D6D 200 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Airworthiness certificate: Standard, Normal - Last inspection: Annual, April 18, 2011, 71 hours before - Departed: 1G0, Bowling Green, OH - Destination: 1G0, Bowling Green, OH - Flight plan: Unknown - Airport: 1G0, Wood County Airport, runway 10, 4,199 × 75 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 55; injuries: none; airline transport, commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; seat: rear - Other flight crew; age 55; injuries: none; airline transport; airplane ratings: single-engine sea, multi-engine sea, single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, without waivers/limitations; seat: front ## Weather - Conditions: Visual (VMC), Day - Wind: 20° at 10 knots, gusting 16 - Visibility: 10 statute miles - Lowest ceiling: 3,000 ft overcast - Temperature: 30 °F, dew point 19 °F - Altimeter: 30.14 inHg - Observed at: TDZ, 12 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 20120219003449A](https://openairdocs.org/incident/20120219003449A), Feb 19, 2012: Aviat Aircraft Inc A-1C-200, Bowling Green, OH, Substantial damage. Aircraft touched down on runway 10 at the Bowling Green Airport. The aircraft made an abrupt left turn. Pilot corrected to the right. Ground loop ensued. Left… ## Docket (15 files) The files NTSB released with the investigation on August 27, 2013, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=83006. 18.6 MB in all. - Record of conversation with pilot (item 1, .PDF, 53 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40398699&FileExtension=.PDF&FileName=Record%20of%20conversation%20with%20pilot-Master.PDF - NTSB accident report request (item 2, .PDF, 42 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40398700&FileExtension=.PDF&FileName=NTSB%20accident%20report%20request-Redacted.PDF - Photo of metal shaving from brake caliper (item 3, .PDF, 1.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40398701&FileExtension=.PDF&FileName=Photo%20of%20metal%20shaving%20from%20brake%20caliper-Master.PDF - photo 1 of piston bores (item 4, .PDF, 2.4 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40398704&FileExtension=.PDF&FileName=photo%201%20of%20piston%20bores-Master.PDF - Photo 2 of piston bores (item 5, .PDF, 2.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40398705&FileExtension=.PDF&FileName=Photo%202%20of%20piston%20bores-Master.PDF - Photo 3 of piston bores (item 6, .PDF, 2.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40398706&FileExtension=.PDF&FileName=Photo%203%20of%20piston%20bores-Master.PDF - Photo 4 of piston bores (item 7, .PDF, 2.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40398707&FileExtension=.PDF&FileName=Photo%204%20of%20piston%20bores-Master.PDF - Photo 1 of brake piston #1 (item 8, .PDF, 1.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40398708&FileExtension=.PDF&FileName=Photo%201%20of%20brake%20piston%20%231-Master.PDF - Photo 2 of brake piston #1 (item 9, .PDF, 1.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40398712&FileExtension=.PDF&FileName=Photo%202%20of%20brake%20piston%20%231-Master.PDF - Photo 3 of brake piston #1 (item 10, .PDF, 1.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40398714&FileExtension=.PDF&FileName=Photo%203%20of%20brake%20piston%20%231-Master.PDF - Photo 4 of brake piston #1 (item 11, .PDF, 1.0 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40398715&FileExtension=.PDF&FileName=Photo%204%20of%20brake%20piston%20%231-Master.PDF - Photo 1 of brake piston #2 (item 12, .PDF, 1.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40398716&FileExtension=.PDF&FileName=Photo%201%20of%20brake%20piston%20%232-Master.PDF - Photo 2 of brake piston #2 (item 13, .PDF, 1.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40398717&FileExtension=.PDF&FileName=Photo%202%20of%20brake%20piston%20%232-Master.PDF - Photo 3 of brake piston #2 (item 14, .PDF, 1.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40398718&FileExtension=.PDF&FileName=Photo%203%20of%20brake%20piston%20%232-Master.PDF - Photo 4 of brake piston #2 (item 15, .PDF, 1.1 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40398719&FileExtension=.PDF&FileName=Photo%204%20of%20brake%20piston%20%232-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.