# NTSB DEN00LA004: Cessna 180D, N6425X, Denver, CO, October 14, 1999 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: October 14, 1999, 10:15 local (16:15 UTC) - Place: Denver, CO - Coordinates: 39.790767, -104.839729 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=39.7908&lon=-104.8397&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report June 23, 2000 - Report: Approved by Office Director - NTSB case key (mKey): 47589 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN00LA004 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/47589/pdf - Page: https://openairdocs.org/ntsb/DEN00LA004 ## Probable cause The excessive taxi speed used by the pilot exiting the runway via a high-speed taxiway resulting in a loss of control. A 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 - weather condition - crosswind - taxispeed - excessive, pilot in command (cause) - aircraft control - not maintained, pilot in command (cause) - Nose over, taxi - from landing ## Analysis During landing roll, the aircraft exited the runway via a high-speed taxiway and despite heavy breaking by the pilot the aircraft nosed over. Wind at the time was a direct cross wind recorded at 10 knots. ## Factual narrative On October 14, 1999, at 1015 mountain daylight time, a Cessna 180D, N6425X, sustained substantial damage when it nosed over during landing roll at Denver International Airport, Denver, Colorado. The private pilot and his pilot certificated passenger were not injured. The flight was operating under Title 14 CFR Part 91 and no flight plan was filed. This personal flight departed Boulder, Colorado, at 0945. Visual meteorological conditions prevailed. According to the pilot, he was exiting the runway (17R) with a right turn onto a high-speed taxiway when the tail and right wing began to rise. The application of heavy breaks had no effect and the aircraft nosed over. At the time of the accident, Denver International Airport recorded wind was from 270 degrees magnetic at 10 knots. There were no gusts recorded. The pilot provided information that he did not believe there was any aircraft malfunction or failure. This was verified by an FAA inspector who examined the aircraft. ## Aircraft - Registration: [N6425X](https://openairdocs.org/aircraft/N6425X), registered now, S/N 18050925, built 1960 (OpenAirDocs) - Reported make and model: Cessna 180D - Registry model: [Cessna 180D](https://openairdocs.org/model/cessna-180d) (registry code 2072610) (OpenAirDocs) - Registry engine: [Continental O-470 series](https://openairdocs.org/engine/continental-o-470-series) (registry code 17026, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 180-50925 - Airframe hours: 4318 - Engines: Continental O-470-L 230 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Roger A. Dalke - Airworthiness certificate: Standard, Normal - Last inspection: Annual, June 23, 1999, 80 hours before - Departed: 1V5, BOULDER, CO - Destination: DEN - Airport: DEN, Denver International, runway 17R, 12,000 × 150 ft, concrete ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 50; private; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 240 total, 87 in this make and model, 149 as pilot in command, 64 in the last 90 days, 36 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 270° at 10 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 75 °F, dew point 21 °F - Altimeter: 30.00 inHg - Observed at: DEN, 1 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 19991014043729A](https://openairdocs.org/incident/19991014043729A), Oct 14, 1999: Cessna 180D, Denver, CO, No damage. (-23) A/c landed on 17R at dia and was directed to turn off the runway at M5, a high speed turn off to the right. When entering the turn the right wing and… ## Other investigations on N6425X (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 CEN11CA518](https://openairdocs.org/ntsb/CEN11CA518), Jul 24, 2011: Cessna 180D (N6425X), Oscoda, MI, substantial damage. Probable cause: The pilot's failure to retract the landing gear before a water landing. Contributing to the accident was the pilot's failure to use a checklist. 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.