Aircraft Incident/Accident Report
Mansfield Lahm Regional Airport

Mansfield, Ohio 44903
Thursday, July 1, 2004 14:30 EDT

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NTSB Narrative Summary Released at Completion of Accident
During the takeoff and initial climb, the engine power was 100 rpm lower than expected, and the oil pressure decreased to 0. The pilot initiated a left turn for a precautionary landing at the airport. The engine continued to lose power during the approach, but it did not experience a total loss of power. The airplane was not aligned with the centerline as it touched down on a runway, and traveled off the left side. Examination of the airplane revealed that the pilot had recently installed a homemade oil cooler adapter on the certificated engine.
NTSB Probable Cause Narrative
The pilot's failure to maintain directional control during a precautionary landing. A factor was the pilot's unapproved maintenance modification resulting in the loss of oil pressure and partial loss of engine power.
Event Information
Type of EventAccident 
Event Date7/1/2004 
Event Day of the WeekThursday 
Time of Event1430 
Event Time ZoneEastern Daylight Time 
Event CityMansfield 
Event StateOHIO 
Event Country-- 
Zipcode of the event site44903 
Event Date Year2004 
Event Date Month
MidAir Collision IndicatorNo 
On Ground Collision occurred ?No 
Event Location Latitude404917N 
Event Location Longitude0823059W 
Event Location AirportMansfield Lahm Regional  
Event Location Nearest Airport IDMFD 
Indicates whether the acc/inc occurred off or on an airportOn Airport 
Distance from airport in statute miles-- 
Degrees magnetic from airport-- 
Airport Elevation-- 
Weather Briefing CompletenessUnknown 
Investigator's weather sourceUnknown 
Time of the weather observation 
Direction of event from weather observation facility (degrees)-- 
Weather Observation Facility IDMFD 
Elevation of weather observation facility-- 
Distance of event from weather observation facility (units?)-- 
Time Zone of the weather observation-- 
Lighting ConditionsDay 
Lowest Ceiling Height-- 
Lowest Non-Ceiling Height-- 
Sky/Lowest/Cloud Conditions-- 
Sky Condition for Lowest CeilingNone 
Visibility Runway Visual Range (Feet)-- 
Visibility Runway Visual Value (Statute Miles)-- 
Visibility (Statute Miles)
Air Temperature at event time (in degrees celsius)27 
Dew Point at event time (in degress fahrenheit)16 
Wind Direction (degrees magnetic)230 
Variable Wind IndicatorWind direction could be determined 
Wind Speed (knots)
Wind Velocity Indicator -- 
Wind Gust IndicatorNot Gusting 
Wind Gust (knots) -- 
Altimeter Setting at event time (in. Hg) -- 
Density Altitude (feet)-- 
Intensity of Precipitation-- 
METAR weather report -- 
Event Highest InjuryNone 
On Ground, Fatal Injuries-- 
On Ground, Minor Injuries-- 
On Ground, Serious Injuries-- 
Injury Total Fatal-- 
Injury Total Minor-- 
Injury Total None
Injury Total Serious-- 
Injury Total All-- 
Investigating AgencyNTSB 
NTSB Docket Number (internal use)16176 
NTSB Notification SourceGreat Lakes Comm Center  
NTSB Notification Date-- 
NTSB Notification Time-- 
Fiche Number and/or location -used to find docket informationDMS 
Date of most recent change to recordSep 1 2004 7:08AM 
User who most recently changed recordNTSB\MONR  
Basic weather conditionsVisual Meteorological Cond 
FAA District Office-- 
Aircraft Involved
Aircraft #1
Aircraft Registration NumberN98EH 
NTSB NumberNYC04CA150 
Missing Aircraft Indicator-- 
Federal Aviation Reg. PartPart 91: General Aviation 
Type of Flight Plan filedNone 
Flight plan Was Activated?No 
DamageSubstantial 
Aircraft FireNone 
Aircraft Explosion-- 
Aircraft Manufacturer's Full NameHenes 
Aircraft ModelZenair CH 701 
Aircraft Series Identifier-- 
Aircraft Serial Number01 
Certified Max Gross Weight-- 
Aircraft CategoryAirplane 
Aircraft Registration ClassU.S. Registered/U.S. Soil 
Aircraft is a homebuilt?Yes 
Flight Crew Seats-- 
Cabin Crew Seats-- 
Passenger Seats-- 
Total number of seats on the aircraft-- 
Number of Engines
Fixed gear or retractable gearFixed 
Aircraft, Type of Last Inspection-- 
Date of Last Inspection-- 
Airframe hours since last inspection-- 
Airframe Hours-- 
ELT InstalledUnknown 
ELT ActivatedUnknown 
ELT Aided Location of Event SiteUnknown 
ELT Type-- 
Aircraft Owner NameEdwin Henes 
Aircraft Owner Street Address-- 
Aircraft Owner CityVenice 
Aircraft Owner StateFL 
Aircraft Owner CountryUSA  
Aircraft Owner Zipcode-- 
Operator is an individual?No 
Operator Name-- 
Operator Same as Owner?Yes 
Operator Is Doing Business As-- 
Operator Address Same as Owner?Yes 
Operator Street Address-- 
Operator City-- 
Operator State-- 
Operator Country-- 
Operator Zip code-- 
Operator Code-- 
Owner has at least one certificateNone 
Other Operator of large aircraft?-- 
Certified for Part 133 or 137 Operation-- 
Operator Certificate Number-- 
Indicates whether an air carrier operation was scheduled or not-- 
Indicates Domestic or International Flight-- 
Operator carrying Pax/Cargo/Mail-- 
Type of Flying (Per_Bus / Primary)Personal 
Second Pilot on Board-- 
Departure Point Same as EventYes 
Departure Airport CodeMFD  
Departure CityMansfield 
Departure StateOH 
Departure CountryUSA 
Departure Time-- 
Departure Time ZoneEDT 
Destination Same as Local Fltdest & departure same, accident can occur anywhere 
Destination Airport CodeMFD  
Destination City-- 
Destination State-- 
Destination Country-- 
Specific Phase of Flight-- 
Report sent to ICAO?No 
Evacuation occurredNo 
Date of most recent change to recordJul 14 2004 11:39AM 
User who most recently changed recordPEAR  
Since inspection or accident-- 
Event Location Runway Number and Location
Runway Length6795 
Runway Width150 
Sight Seeing flightNo 
Air Medical FlightNo 
Medical Flight--