# NTSB DEN07CA086: Cessna 170A, N1258D, Watkins, CO, April 11, 2007 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: April 11, 2007, 14:30 local (20:30 UTC) - Place: Watkins, CO - Coordinates: 39.785278, -104.543052 - Nearby events: https://openairdocs.org/map.md?lat=39.7853&lon=-104.5431&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report June 27, 2007 - Report: Approved by Office Director - Parties: FAA Flight Standards District Office - NTSB case key (mKey): 65624 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN07CA086 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/65624/pdf - Page: https://openairdocs.org/ntsb/DEN07CA086 ## Probable cause A total failure during landing roll of the right brake caused by severely worn shoes, causing the caliper pins to engaged misaligned. A contributing factor was the pilot's inability to maintain directional control. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Airframe/component/system failure/malfunction, landing - roll - landing gear,normal brake system - failure,total (cause) - Dragged wing,rotor,pod,float or tail/skid, landing - roll - directional control - not possible, pilot in command (contributing factor) ## Analysis The pilot had been practicing touch-and-go landings. On his final landing, the airplane swerved to the right and the right wing struck the ground, bending the spar. The airplane then departed the runway. According to the FAA airworthiness inspector who examined the airplane, the right brake caliper assembly showed "severely worn shoes with uneven wear." The inspector surmised that when the pilot applied the brakes, the uneven brake shoe wear "caused the caliper pins to engage misaligned, contacting the rotor, locking and shearing the caliper assembly." ## Factual narrative On April 11, 2007, approximately 1430 mountain daylight time, a Cessna 170A, N1258D, piloted by an airline transport-certificated pilot, was substantially damaged when the right brake failed and the airplane veered to the right and departed runway 35 at Front Range Airport (FTG) Watkins, Colorado. Visual meteorological conditions prevailed at the time of the accident. The personal flight was being conducted under the provisions of Title 14 CFR Part 91 without a flight plan. The pilot was not injured. The local flight originated approximately 1340. The pilot had been practicing touch-and-go landings. On his final landing, the airplane swerved to the right and the right wing struck the ground, bending the spar. The airplane then departed the runway. According to the FAA airworthiness inspector who examined the airplane, the right brake caliper assembly showed "severely worn shoes with uneven wear." The inspector surmised that when the pilot applied the brakes, the uneven brake shoe wear "caused the caliper pins to engage misaligned, contacting the rotor, locking and shearing the caliper assembly." ## Aircraft - Registration: [N1258D](https://openairdocs.org/aircraft/N1258D), registered now, S/N 19812, built 1951 (OpenAirDocs) - Reported make and model: Cessna 170A - Registry model: [Cessna 170A](https://openairdocs.org/model/cessna-170a) (registry code 2072304) (OpenAirDocs) - Registry engine: [Continental C145 series](https://openairdocs.org/engine/continental-c145-series) (registry code 17012, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 19812 - Engines: Continental 145 145 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Jade B. Norstrom - Airworthiness certificate: Standard, Normal - Last inspection: Annual, April 1, 2006 - Departed: FTG, Watkins, CO - Destination: FTG, Watkins, CO - Airport: FTG, Front Range, runway 35, 8,000 × 100 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 37; injuries: none; airline transport; airplane ratings: single-engine land, single-engine sea; instrument ratings: airplane; medical: class 1, with waivers/limitations; last flight review November 1, 2006; seat: left; flight hours: 7,500 total, 50 in this make and model ## Weather - Conditions: Visual (VMC), Day - Wind: 360° at 7 knots, gusting 16 - Visibility: 10 statute miles - Lowest ceiling: 12,000 ft broken - Temperature: 48 °F, dew point 3 °F - Altimeter: 29.78 inHg - Observed at: FTG ## 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 20070411006589A](https://openairdocs.org/incident/20070411006589A), Apr 11, 2007: Cessna 170A, Denver, CO, Substantial damage. (-23) Aircraft was cleared to land rwy 35. While executing landing roll, left gust/wind pilot corrected w/full right rudder and brakes, right brake locked,… 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.