# NTSB DEN01LA085: Boyd Young Kolb Mark III, N1225Y, Brigham City, UT, April 11, 2001 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Limited investigation · Final report - Date: April 11, 2001, 09:30 local (15:30 UTC) - Place: Brigham City, UT - Coordinates: 41.509082, -112.039901 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=41.5091&lon=-112.0399&mi=10 - Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping) - Highest injury: Minor injuries - Injuries: 1 minor, 1 uninjured - Status: Completed, report July 25, 2002 - Report: Approved by Office Director - Parties: FAA Flight Standards District Office - NTSB case key (mKey): 52062 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN01LA085 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/52062/pdf - Page: https://openairdocs.org/ntsb/DEN01LA085 ## Probable cause the pilot's misjudged landing flare, which resulted in a hard landing. A factor was the propeller tip separation due to foreign object damage. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Propeller failure/malfunction, takeoff - initial climb - propeller system/accessories,blade - foreign object damage (contributing factor) - propeller system/accessories,blade - loss,partial (contributing factor) - Hard landing, landing - flare/touchdown - flare - misjudged, pilot in command (cause) - terrain condition - loose gravel/sandy ## Analysis The pilot took off on runway 34 and climbed to 5,000 feet msl. After leveling off, the engine started to shake violently. The pilot turned to initiate a forced landing on runway 16 and realized he was not going to make the runway, but was going to make the gravel run-out area. The pilot said that he maintained 55 mph until the beginning of the flare. He said the airplane's energy bleeds off very fast, and the flare is done at the last moment. Upon landing the left main landing gear collapsed, and the fuselage hit the ground and skidded for 35 to 50 yards. The pilot stated "that a FOD (dental pick) used in maintenance two days earlier and not found in two to three times going over the engine and one preflight, had dislodged from [a] hiding place and hit the prop." A 2 x 2 inch section of propeller tip was missing. ## Factual narrative On April 11, 2001, at approximately 0930 mountain daylight time, a Young Kolb Mark III, an experimental homebuilt, N1225Y, was substantially damaged during a hard landing at Brigham City Airport, Brigham City, Utah. The private pilot received minor injuries and his passenger was not injured. The airplane was being operated by the pilot under Title 14 CFR Part 91. Visual meteorological conditions prevailed for the local personal flight which was originating at the time of the accident. The pilot had not filed a flight plan. According to the pilot's accident report, he performed a thorough pre-flight examination of the aircraft and departed on runway 34. Upon reaching the pattern altitude of 5,000 feet msl, the airplane began to "shake violently," like a "prop tip separation." The pilot then reduced power and the shaking minimized. He increased power again and the shaking returned, so he again reduced power. He then initiated a 180 degree turn to return to runway 16, and configured the airplane for best glide angle speed. The pilot realized that he was not going to reach the end of the runway, but he could reach the gravel run out area. The pilot said he was "happy with that spot" and told his passenger that they were going to make an off runway landing. He said he maintained 55 mph until the beginning of the flare. He felt he did not have enough control authority to slow the vertical descent as the airplane "bleeds off energy very fast; the flair [flare] was done at the last moment and we had hit the ground before I could add power." The left main landing gear collapsed, and subsequently the fuselage impacted the ground and skidded for 35 to 50 yards. The bent fuselage rotated and came to rest 180 degrees from the runway heading. The pilot stated "that a FOD (dental pick) used in maintenance two days earlier and not found in two to three times going over the engine and one preflight, had dislodged from [a] hiding place and hit the prop. There is about a 2 x 2 inch section of prop tip missing." ## Aircraft - Registration: [N1225Y](https://openairdocs.org/aircraft/N1225Y), registered now, S/N B1Y, built 2000 (OpenAirDocs) - Reported make and model: Boyd Young Kolb Mark III - Registry model: [Young Boyd W KOLB MARK III](https://openairdocs.org/model/young-boyd-w-kolb-mark-iii) (registry code 056091O) (OpenAirDocs) - Registry engine: [Bombardier ROTAX (ALL)](https://openairdocs.org/engine/bombardier-rotax-all) (registry code 09050, reciprocating) (OpenAirDocs) - Category: Airplane, amateur-built - Serial number: B1Y - Airframe hours: 118.3 - Engines: Rotax 912 UZ 80 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Boyd W. Young - Airworthiness certificate: Special, Experimental (Special) - Last inspection: Annual, July 24, 2000, 72.8 hours before - Departed: BMC, Brigham City, UT - Airport: BMC, Brigham City, runway 160, 7,500 × 100 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 47; injuries: minor; private; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; last flight review May 19, 2000; seat: left; flight hours: 193 total, 110 in this make and model, 130 as pilot in command, 17 in the last 90 days, 4 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 150° at 6 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 43 °F, dew point 25 °F - Altimeter: 29.82 inHg - Observed at: OGD, 25 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 20010411006489A](https://openairdocs.org/incident/20010411006489A), Apr 11, 2001: Amtr KOLBMK3, Brigham City, UT, Substantial damage. (-23) Pilot experienced severe engine vibration during take-off climb. Pilot reduced power in an attempt to lessen the vibration and attempted an emergency… 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.