# NTSB SEA98LA030: Raser Mini 500, N500YY, Newberg, OR, January 28, 1998 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: January 28, 1998, 15:50 local (23:50 UTC) - Place: Newberg, OR - Coordinates: 45.320705, -122.979957 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=45.3207&lon=-122.9800&mi=10 - Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report December 8, 1998 - Report: Approved by Office Director - NTSB case key (mKey): 42750 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA98LA030 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/42750/pdf - Page: https://openairdocs.org/ntsb/SEA98LA030 ## Probable cause a power loss resulting from overtemperature of a cylinder. The pilot's operation with known deficiencies was a factor. ## Analysis The pilot reported that he had just lifted off and attained an altitude of about 20 feet, when the engine experienced a loss of power. The pilot initiated an autorotation near the end of the airpark. The pilot stated that the helicopter was yawed slightly to the left on touchdown to a plowed muddy area. The right side landing skid collapsed and the helicopter rolled over. Inspection of the engine revealed that one of the two cylinders would not hold compression. Further inspection found evidence of overheating and damage to the rings on the piston. The pilot reported that the engine had been experiencing heating problems, and that he had also modified the carburetor. ## Factual narrative On January 28, 1998, at 1550 Pacific standard time, a homebuilt Raser Mini 500, N500YY, operated by the pilot as a 14 CFR Part 91 personal flight, collapsed the right landing skid and rolled over after initiating an autorotation as a result of a loss of engine power shortly after takeoff from Sportsman Airpark, Newberg, Oregon. Visual meteorological conditions prevailed at the time and no flight plan was filed. The helicopter was substantially damaged and the airline transport pilot, the sole occupant, was not injured. During an interview with a Federal Aviation Administration Inspector and subsequent written statement, the pilot reported that he had just lifted off and attained an altitude of about 20 feet, when the engine experienced a loss of power. The pilot initiated an autorotation near the south end of the airpark to a plowed muddy area. The pilot stated that the helicopter was yawed slightly to the left on touchdown. The right side landing skid collapsed and the helicopter rolled over onto its right side. Inspection of the engine revealed that one of the two cylinders would not hold compression. Further inspection of the cylinder found evidence of overheating and damage to the rings on the piston. The pilot reported that the engine had been experiencing heating problems, and that he had also modified the carburetor. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power, takeoff - engine assembly,cylinder - overtemperature (cause) - operation with known deficiencies in equipment - continued, pilot in command (contributing factor) - Forced landing, emergency landing - Other gear collapsed, emergency landing - landing gear,skid assembly - overload - Roll over, emergency landing ## Aircraft - Registration: [N500YY](https://openairdocs.org/deregistered/N500YY-2016-08-16), registration cancelled 2016-08-16, S/N 298, built 1997 (OpenAirDocs) - Reported make and model: Raser MINI 500 - Registry model: [Raser Ralph W MINI 500](https://openairdocs.org/model/raser-ralph-w-mini-500) (registry code 05604JI) (OpenAirDocs) - Registry engine: [Bombardier ROTAX (ALL)](https://openairdocs.org/engine/bombardier-rotax-all) (registry code 09050, reciprocating) (OpenAirDocs) - Category: Helicopter, amateur-built - Serial number: 298 - Airframe hours: 48 - Engines: Bombardier 582UL 65 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Ralph W. Raser - Airworthiness certificate: Special, Experimental (Special) - Last inspection: Annual, September 22, 1997, 48 hours before - Destination: CANBY, OR - Airport: 2S6, Sportsman Airpark ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 53; airline transport, flight engineer, commercial, flight instructor; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: front; flight hours: 22,000 total, 48 in this make and model, 14,000 as pilot in command, 100 in the last 90 days, 20 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: 330° at 9 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 52 °F, dew point 45 °F - Altimeter: 29.00 inHg - Observed at: MMV, 23 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 19980128006179A](https://openairdocs.org/incident/19980128006179A), Jan 28, 1998: Amtr MINI500, Newberg, OR, Substantial damage. Engine quit on liftoff. Autorotated yawing on touchdown. Skid collapsed. Helicopter roller over. (.4)the pilot reported that he had just lifted off and… 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.