# NTSB SEA00LA143: Jim Weseman Challenger II, Chiloquin, OR, July 23, 2000 - Type: NTSB accident investigation - Classification: Accident · Serious injuries · Limited investigation · Final report - Date: July 23, 2000, 08:15 local (15:15 UTC) - Place: Chiloquin, OR - Coordinates: 42.999996, -121.629165 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=43.0000&lon=-121.6292&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: Serious injuries - Injuries: 1 serious - Status: Completed, report May 18, 2001 - Report: Approved by Office Director - NTSB case key (mKey): 49917 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA00LA143 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/49917/pdf - Page: https://openairdocs.org/ntsb/SEA00LA143 ## Probable cause Loss of engine power for undetermined reasons. Unsuitable terrain and the pilot's failure to maintain aircraft control were factors. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power, cruise - reason for occurrence undetermined (cause) - In flight collision with terrain/water, descent - uncontrolled - terrain condition - none suitable (contributing factor) - aircraft control - not maintained, pilot in command (contributing factor) ## Analysis The pilot reported that prior to departure, the engine had been running rough and that he aborted two takeoffs prior to the flight. After changing the spark plugs, the flight departed. About ten minutes after departure, the engine lost power. During a left turn to a clearing over heavy timber terrain, the aircraft lost airspeed and went into a dive. The aircraft descended about 800 feet before the pilot was able to pull the nose up just prior to colliding with the terrain. The pilot reported that he thought that this aircraft met the requirements of an ultralight and had not maintained this aircraft in accordance with an annual inspection program. It was later determined that this aircraft did not meet the ultralight requirements and should have been issued an airworthiness certificate and registered. The cause of the loss of power was not determined. ## Factual narrative On July 23, 2000, about 0815 Pacific daylight time, an unregistered Challenger II, registered to and operated by the non-certificated pilot as a 14 CFR Part 91 personal flight, collided with the terrain following a loss of engine power near Chiloquin, Oregon. Visual meteorological conditions prevailed and no flight plan was filed. The aircraft was substantially damaged and the pilot received serious injuries. The flight departed from the pilot's residence in Chiloquin, about 10 minutes prior to the accident and was en route to the Chiloquin Airport. The pilot reported to the Federal Aviation Administration Inspector from the Portland, Oregon, Flight Standards District Office that the engine had been running rough and that he had aborted two takeoffs prior to the flight. The pilot changed the spark plugs, then took off for the flight to Chiloquin. In a written statement, the pilot reported that approximately 10 minutes after departure, the "engine failed, and lost power over heavy timber terrain." The pilot spotted a clearing for a forced landing and made a left turn. The pilot reported that during the turn, the aircraft "...lost speed and went into a dive." The aircraft descended about 800 feet before the pilot was able to pull the nose up just prior to colliding with the ground. Information provided by the pilot revealed that he thought that the aircraft was classified as an ultralight and did not require an airworthiness certificate or registration. It was later determined that it did not meet the ultralight requirements as stated in 14 CFR Part 103 Ultralight Vehicles. The pilot also reported that the aircraft had not been inspected in accordance with an annual maintenance program. Approximately 263 hours had been accumulated on the engine at the time of the accident. The reason for the loss of engine power was not determined. The pilot at one time held a student pilot certificate, however, that had expired several years prior to the accident. No student endorsements were identified. The pilot reported that he had accumulated a total flight time in this make/model aircraft of 263 hours at the time of the accident. ## Aircraft - Registration: UNREG (not matched to a registry record) - Reported make and model: JIM WESEMAN CHALLENGER II (CHALLENGER) - Category: Airplane, amateur-built - Serial number: CH21193-1052 - Engines: Rotax 503 50 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Jim L. Weseman - Airworthiness certificate: Standard, Normal - Departed: CHILOQUIN, OR - Destination: 2S7, CHILOQUIN, OR ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 63; student; seat: front; flight hours: 263 total, 263 in this make and model, 263 as pilot in command ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 72 °F 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.