# NTSB LAX07CA010: Monocoupe 110 Special, N501W, Chandler, AZ, October 15, 2006 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: October 15, 2006, 14:00 local (21:00 UTC) - Place: Chandler, AZ - Coordinates: 33.268054, -111.806663 - Nearby events: https://openairdocs.org/map.md?lat=33.2681&lon=-111.8067&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report January 31, 2007 - Report: Approved by Office Director - Parties: Federal Aviation Administration - NTSB case key (mKey): 64715 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX07CA010 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/64715/pdf - Page: https://openairdocs.org/ntsb/LAX07CA010 ## Probable cause the failure of the forward left main landing gear attach point resulting in loss of control. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Airframe/component/system failure/malfunction, landing - flare/touchdown - landing gear,main gear strut - failure (cause) - Loss of control - on ground/water, landing - roll - directional control - not possible, pilot in command - On ground/water encounter with terrain/water, landing - roll - terrain condition - soft - Nose over, landing - roll ## Analysis The 70-year-old antique airplane veered off the runway and nosed over when the left landing gear forward attach point failed on touchdown. The airplane nosed over when it encountered the soft sand next to the runway, resulting in substantial damage to the vertical stabilizer. The owner pilot reported that the gear's forward attach point that is located under a fairing appeared to have failed on touchdown. A Federal Aviation Administration inspector examined the failure point, but was unable to determine the mode of failure. ## Factual narrative On October 15, 2006, at 1400 mountain standard time, a Monocoupe 110 Special, N501W, veered off the runway after the left landing gear collapsed during the landing rollout at Chandler Municipal Airport (CHD), Chandler, Arizona. The owner/pilot was operating the airplane under the provisions of 14 CFR Part 91. The airline transport pilot, the sole occupant, was not injured; the airplane sustained substantial damage. The cross-country personal flight departed Eloy, Arizona, about 1330, with a planned destination of Chandler. Visual meteorological conditions prevailed, and no flight plan had been filed. The approximate global positioning system (GPS) coordinates of the primary wreckage were 33 degrees 16.05 minutes north latitude and 111 degrees 48.24 minutes west longitude. The pilot reported that upon touchdown on runway 22L, the left landing gear forward tube failed "just below the mounting lugs" and the airplane skidded off the left side of the runway. The airplane nosed over when it contacted soft sand, and the vertical stabilizer sustained substantial damage. The pilot reported that the last annual inspection occurred on February 3, 2006. At the time of the accident, the recorded airframe total time was 723 hours. The pilot indicated that the airplane was originally built in the 1930's. The landing gear forward attach point was located under a fairing. A Federal Aviation Administration inspector examined the failure point but was unable to determine the exact mode of failure. ## Aircraft - Registration: [N501W](https://openairdocs.org/aircraft/N501W), registered now, S/N 5W47 (OpenAirDocs) - Reported make and model: Monocoupe 110 Special - Registry model: [Monocoupe 110 SPECIAL](https://openairdocs.org/model/monocoupe-110-special) (registry code 5810204) (OpenAirDocs) - Registry engine: [Warner SS40&50](https://openairdocs.org/engine/warner-ss40-50) (registry code 64503, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 5W47 - Airframe hours: 723 - Engines: Warner R550-3 185 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Airworthiness certificate: Standard, Normal - Last inspection: Annual, February 1, 2006 - Departed: E60, Eloy, AZ - Destination: CHD, Chandler, AZ - Airport: CHD, Chandler Municipal Airport, runway 22L, 4,870 × 75 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 62; injuries: none; flight instructor, airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; last flight review July 1, 2006; seat: left; flight hours: 28,500 total, 69 in this make and model, 23,500 as pilot in command, 110 in the last 90 days, 35 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 300° at 5 knots - Visibility: 40 statute miles - Lowest ceiling: 15,000 ft broken - Temperature: 73 °F, dew point 43 °F - Altimeter: 29.70 inHg - Observed at: CHD ## 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 20061015024969A](https://openairdocs.org/incident/20061015024969A), Oct 15, 2006: Mncoup 110SPECIAL, Chandler, AZ, Substantial damage. (-23) Coming into land at chd on runway 22 left (in 5 knot crosswind) aircraft touched down and left wing dipped and struck ground. Pilot momentarily regained… ## Other investigations on N501W (1) 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. - [NTSB GAA16CA190](https://openairdocs.org/ntsb/GAA16CA190), Apr 12, 2016: Monocoupe 110 (N501W), Chandler, AZ, substantial damage. Probable cause: The pilot's incorrect installation of the tailwheel steering bungee, which resulted in a runway excursion and airplane nose over. 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.