# NTSB DEN00LA158: Maule MX-7-235, N111KD, Broomfield, CO, August 29, 2000 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: August 29, 2000, 11:00 local (17:00 UTC) - Place: Broomfield, CO - Coordinates: 39.829524, -105.060729 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=39.8295&lon=-105.0607&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report September 19, 2001 - Report: Approved by Office Director - NTSB case key (mKey): 50120 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN00LA158 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/50120/pdf - Page: https://openairdocs.org/ntsb/DEN00LA158 ## Probable cause the pilot's failure to maintain directional control during landing roll. A contributing factor was the crosswind. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of control - on ground/water, landing - roll - directional control - not maintained, pilot in command (cause) - weather condition - crosswind (contributing factor) - ground loop/swerve - inadvertent, pilot in command - Main gear collapsed, landing - roll ## Analysis During the landing roll on runway 29L, the left wing lifted, and the airplane ground looped to the right. The airplane departed the right side of the runway, and the left main gear collapsed. The recorded wind at the time of the accident was 350 degrees at 10 knots, or a 9 knot direct crosswind. The pilot stated that "more diligence on landing, quicker response to divergence of [the] aircraft" could have prevented the accident. ## Factual narrative On August 29, 2000, approximately 1100 mountain daylight time, a Maule MX-7-235, N111KD, sustained substantial damage when it departed the side of the runway during landing at Jeffco Airport (BJC), Broomfield, Colorado. The private pilot, the sole occupant in the airplane, was not injured. The pilot was operating the airplane under Title 14 CFR Part 91. Visual meteorological conditions prevailed for the cross-country personal flight that originated 1 hour 40 minutes before the accident. No flight plan had been filed. The pilot reported that during landing roll on runway 29L, the left wing "suddenly lifted." He said the aircraft ground looped to the right and departed the right side of the runway. According to airport authorities, the left main landing gear collapsed. The left wing aft spar, the furthest outboard rib, and the left side of the fuselage were damaged. The airport authorities assisted the pilot in unloading a "large cooler" of elk meat. Documentation provided by the pilot indicates that the airplane was within weight and balance limitations. The pilot submitted a letter to the Investigator-In-Charge (IIC) suggesting that wake turbulence from a preceding landing aircraft may have upset his airplane. The recorded wind at the time of the accident was 350 degrees at 10 knots, or a 9 knot direct crosswind. The Aeronautical Information Manual (AIM) states that aircraft wingtip vortices move horizontally, near the ground, at 3 knots. The IIC calculated that runway 29L would have been cleared of all wingtip vortexes in 5 to 8 seconds. The pilot stated on his accident report that "more diligence on landing, quicker response to divergence of [the] aircraft" could have prevented the accident. ## Aircraft - Registration: [N111KD](https://openairdocs.org/aircraft/N111KD), registered now, S/N 10049C (OpenAirDocs) - Reported make and model: Maule MX-7-235 - Registry model: [Maule MX-7-235](https://openairdocs.org/model/maule-mx-7-235) (registry code 5470207) (OpenAirDocs) - Registry engine: [Lycoming IO-540 series](https://openairdocs.org/engine/lycoming-io-540-series) (registry code 41530, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 10049C - Airframe hours: 1204 - Engines: Lycoming IO-540-W1A5D 235 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Kenneth A. Davis - Airworthiness certificate: Standard, Normal - Last inspection: Annual, July 28, 2000, 23 hours before - Departed: LXV, LEADVILLE, CO - Destination: BJC, CO - Airport: BJC, Jeffco Airport, runway 29L, 7,000 × 75 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 53; private; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 3, valid medical--no waivers/lim.; seat: left; flight hours: 2,109 total, 1,012 in this make and model, 2,084 as pilot in command, 26 in the last 90 days, 19 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 350° at 10 knots - Visibility: 20 statute miles - Lowest ceiling: 20,000 ft broken - Temperature: 163 °F, dew point 135 °F - Altimeter: 30.00 inHg - Observed at: BJC ## 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 20000829013659A](https://openairdocs.org/incident/20000829013659A), Aug 29, 2000: Maule MX7235, Denver, CO, No damage. (-23) The pilot and sole occupant of a/c was landing at the Jeffco Airport (bjc) on rwy 29L. According to the pilot a gust of wind struck the a/c while… 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.