# NTSB DEN05LA043: Mooney M20E, N5550Q, Telluride, CO, December 23, 2004 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: December 23, 2004, 15:15 local (22:15 UTC) - Place: Telluride, CO - Coordinates: 37.953334, -107.908332 - Nearby events: https://openairdocs.org/map.md?lat=37.9533&lon=-107.9083&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 4 uninjured - Status: Completed, report June 8, 2005 - Report: Approved by Office Director - Parties: FAA Flight Standards District Office - NTSB case key (mKey): 60788 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN05LA043 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/60788/pdf - Page: https://openairdocs.org/ntsb/DEN05LA043 ## Probable cause the pilot's improper in-flight decision making and inadvertent retraction of the landing gear resulting in a wheels up landing. A contributing factor included the pilot's attention being diverted by the seized engine tachometer. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Airframe/component/system failure/malfunction, climb - engine instruments,tachometer - seized - hydraulic system,line - contamination,water - Wheels up landing, emergency landing - in-flight planning/decision - improper, pilot in command (cause) - diverted attention, pilot in command (contributing factor) - gear retraction - inadvertent, pilot in command (cause) - terrain condition - runway ## Analysis The pilot stated that during the climb he noticed the tachometer was "reading high and erratic." As he continued to climb, he heard a sharp, piercing, "screeching and chirping noise." The pilot stated that he adjusted the propeller control and was able to "detect an audible reduction in the engine speed"; however, the screeching and chirping noise continued to increase in volume. The pilot elected to return to the airport to land. While on a right downwind leg for runway 09, the pilot extended his landing gear and attempted to extend flaps. The pilot stated that the flaps would not extend. He "slipped the airplane to slow [his airspeed] and descend." On short final, the pilot stated he inadvertently retracted the landing gear but was unaware of his error until the propeller hit the ground during the landing flare. The airplane was substantially damaged. Postaccident examination of the airplane revealed that a bearing had seized inside of the engine tachometer and was producing the squealing and chirping noise. Further examination revealed that moisture had contaminated the hydraulic system and had frozen, preventing the extension of the flaps. No other anomalies with the engine, propeller or other airplane systems were noted. According to the aviation routine weather report (METAR) for TEX, the temperature the day of the accident was 9 degrees Fahrenheit. ## Factual narrative On December 23, 2004, approximately 1415 mountain standard time, a Mooney M20E, N5550Q, operated by a commercial pilot, was substantially damaged during a wheels up landing at Telluride Regional Airport (TEX), Telluride, 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 and his three passengers reported no injuries. The cross-country flight originated approximately 1400 and was en route to San Diego, California. In the accident report submitted by the pilot, he stated that during the climb he noticed the tachometer was "reading high and erratic." As he continued to climb, he heard a sharp, piercing, "screeching and chirping noise." The pilot stated that he adjusted the propeller control and was able to "detect an audible reduction in the engine speed;" however, the screeching and chirping noise continued to increase in volume. The pilot elected to return to TEX to land. While on a right downwind leg for runway 09, the pilot extended his landing gear and attempted to extend flaps. The pilot stated that the flaps would not extend. He "slipped the airplane to slow [his airspeed] and descend." On short final, the pilot stated he inadvertently retracted the landing gear but was unaware of his error until the propeller hit the ground during the landing flare. The left wing rear carry-through spar was ground down and two ribs were bent. Flap fittings were bent and flap hinges were displaced. Postaccident examination of the airplane, conducted by an airframe and powerplant mechanic, revealed that a bearing had seized inside of the engine tachometer and was producing the squealing and chirping noise. Further examination revealed that moisture had contaminated the hydraulic system and had frozen, preventing the extension of the flaps. No other anomalies with the engine, propeller or other airplane systems were noted. According to the aviation routine weather report (METAR) for TEX, the temperature the day of the accident was 9 degrees Fahrenheit. ## Aircraft - Registration: [N5550Q](https://openairdocs.org/aircraft/N5550Q), registered now, S/N 628, built 1965 (OpenAirDocs) - Reported make and model: Mooney M20E - Registry model: [Mooney M20E](https://openairdocs.org/model/mooney-m20e) (registry code 5870212) (OpenAirDocs) - Registry engine: [Lycoming I0360 series](https://openairdocs.org/engine/lycoming-i0360-series) (registry code 41515, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 628 - Airframe hours: 4598.3 - Engines: Lycoming IO-360 200 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Airworthiness certificate: Standard, Normal - Last inspection: Annual, December 8, 2003, 126 hours before - Departed: TEX, Telluride, CO - Destination: MYF, Telluride, CO - Airport: TEX, Telluride Regional, runway 27, 6,870 × 100 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 43; injuries: none; commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; last flight review March 26, 2003; seat: left; flight hours: 2,525 total, 2,000 in this make and model, 2,441 as pilot in command, 25 in the last 90 days, 13 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 4 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 9 °F, dew point -13 °F - Altimeter: 29.94 inHg - Observed at: TEX, 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 20041223032749A](https://openairdocs.org/incident/20041223032749A), Dec 23, 2004: Mooney M20E, Telluride, CO, Substantial damage. (-23) Pilot heard screeching noise (not sure where from), applied power anddid a go around landing downwind, tachometer was reading erratic, but engine still… 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.