Mansfield Lahm Regional Airport
Aircraft Accident/Incident Report

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

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 Event Accident
Event Date 7/1/2004
Event Day of the Week Thursday
Time of Event 1430
Event Time Zone Eastern Daylight Time
Event City Mansfield
Event State OHIO
Event Country --
Zipcode of the event site 44903
Event Date Year 2004
Event Date Month 7
MidAir Collision Indicator No
On Ground Collision occurred ? No
Event Location Latitude 404917N
Event Location Longitude 0823059W
Event Location Airport Mansfield Lahm Regional
Event Location Nearest Airport ID MFD
Indicates whether the acc/inc occurred off or on an airport On Airport
Distance from airport in statute miles --
Degrees magnetic from airport --
Airport Elevation --
Weather Briefing Completeness Unknown
Investigator's weather source Unknown
Time of the weather observation
Direction of event from weather observation facility (degrees) --
Weather Observation Facility ID MFD
Elevation of weather observation facility --
Distance of event from weather observation facility (units?) --
Time Zone of the weather observation --
Lighting Conditions Day
Lowest Ceiling Height --
Lowest Non-Ceiling Height --
Sky/Lowest/Cloud Conditions --
Sky Condition for Lowest Ceiling None
Visibility Runway Visual Range (Feet) --
Visibility Runway Visual Value (Statute Miles) --
Visibility (Statute Miles) 8
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 Indicator Wind direction could be determined
Wind Speed (knots) 7
Wind Velocity Indicator --
Wind Gust Indicator Not Gusting
Wind Gust (knots) --
Altimeter Setting at event time (in. Hg) --
Density Altitude (feet) --
Intensity of Precipitation --
METAR weather report --
Event Highest Injury None
On Ground, Fatal Injuries --
On Ground, Minor Injuries --
On Ground, Serious Injuries --
Injury Total Fatal --
Injury Total Minor --
Injury Total None 1
Injury Total Serious --
Injury Total All --
Investigating Agency NTSB
NTSB Docket Number (internal use) 16176
NTSB Notification Source Great Lakes Comm Center
NTSB Notification Date --
NTSB Notification Time --
Fiche Number and/or location -used to find docket information DMS
Date of most recent change to record Sep 1 2004 7:08AM
User who most recently changed record NTSB\MONR
Basic weather conditions Visual Meteorological Cond
FAA District Office --

Aircraft Involved

Aircraft #1

Aircraft Registration Number N98EH
NTSB Number NYC04CA150
Missing Aircraft Indicator --
Federal Aviation Reg. Part Part 91: General Aviation
Type of Flight Plan filed None
Flight plan Was Activated? No
Damage Substantial
Aircraft Fire None
Aircraft Explosion --
Aircraft Manufacturer's Full Name Henes
Aircraft Model Zenair CH 701
Aircraft Series Identifier --
Aircraft Serial Number 01
Certified Max Gross Weight --
Aircraft Category Airplane
Aircraft Registration Class U.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 1
Fixed gear or retractable gear Fixed
Aircraft, Type of Last Inspection --
Date of Last Inspection --
Airframe hours since last inspection --
Airframe Hours --
ELT Installed Unknown
ELT Activated Unknown
ELT Aided Location of Event Site Unknown
ELT Type --
Aircraft Owner Name Edwin Henes
Aircraft Owner Street Address --
Aircraft Owner City Venice
Aircraft Owner State FL
Aircraft Owner Country USA
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 certificate None
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 Event Yes
Departure Airport Code MFD
Departure City Mansfield
Departure State OH
Departure Country USA
Departure Time --
Departure Time Zone EDT
Destination Same as Local Flt dest & departure same, accident can occur anywhere
Destination Airport Code MFD
Destination City --
Destination State --
Destination Country --
Specific Phase of Flight --
Report sent to ICAO? No
Evacuation occurred No
Date of most recent change to record Jul 14 2004 11:39AM
User who most recently changed record PEAR
Since inspection or accident --
Event Location Runway Number and Location 5
Runway Length 6795
Runway Width 150
Sight Seeing flight No
Air Medical Flight No
Medical Flight --