# NTSB NYC04CA150: Henes Zenair CH 701, N98EH, Mansfield, OH, July 1, 2004 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: July 1, 2004, 14:30 local (18:30 UTC) - Place: Mansfield, OH - Coordinates: 40.821388, -82.516387 - Nearby events: https://openairdocs.org/map.md?lat=40.8214&lon=-82.5164&mi=10 - Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report September 1, 2004 - Report: Approved by Office Director - NTSB case key (mKey): 59549 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=NYC04CA150 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/59549/pdf - Page: https://openairdocs.org/ntsb/NYC04CA150 ## Probable cause 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. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power(partial) - mech failure/malf, takeoff - initial climb - maintenance,modification - not approved, pilot in command (contributing factor) - lubricating system - no pressure (contributing factor) - Loss of control - on ground/water, emergency landing after takeoff - directional control - not maintained, pilot in command (cause) - On ground/water collision with object, emergency landing after takeoff - object - runway light ## Analysis 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. ## Factual narrative On July 1, 2004, about 1430 eastern daylight time, an amateur built Zenair CH 701, N98EH, was substantially damaged during a precautionary landing, following a partial loss of engine power after takeoff from Mansfield Lahm Regional Airport (MFD), Mansfield, Ohio. The certificated private pilot was not injured. Visual meteorological conditions prevailed, and no flight plan was filed for the local personal flight conducted under 14 CFR Part 91. The pilot reported that he tookoff from runway 23 at MFD. Over the departure end of the runway, the pilot noted that 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 on runway 5, a 5,795-foot-long, 150-foot wide, asphalt runway. The engine continued to lose power during the approach to the runway, but did not experience a total loss of power. The airplane was not aligned with the centerline as it touched down on runway 5, and traveled off the left side. The airplane subsequently struck runway lights and came to rest inverted in a grass area off the left side of the runway. A Federal Aviation Administration inspector examined the airplane. The examination revealed that the pilot had recently installed a homemade oil cooler adapter on the Continental C-75 engine. ## Aircraft - Registration: [N98EH](https://openairdocs.org/deregistered/N98EH-2013-04-26), registration cancelled 2013-04-26, S/N 001, built 2003 (OpenAirDocs) - Reported make and model: Henes Zenair CH 701 - Registry model: [Henes Edwin E ZENAIR STOL CH 701](https://openairdocs.org/model/henes-edwin-e-zenair-stol-ch-701) (registry code 05611MT) (OpenAirDocs) - Registry engine: [Continental C85 series](https://openairdocs.org/engine/continental-c85-series) (registry code 17008, reciprocating) (OpenAirDocs) - Category: Airplane, amateur-built - Serial number: 01 - Engines: Continental C-75 reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Edwin Henes - Airworthiness certificate: Special, Experimental (Special) - Departed: MFD, Mansfield, OH - Destination: MFD - Airport: MFD, Mansfield Lahm Regional, runway 5, 6,795 × 150 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 76; injuries: none; private; airplane ratings: single-engine land; medical: class 3; seat: left; flight hours: 360 total, 10 in this make and model ## Weather - Conditions: Visual (VMC), Day - Wind: 230° at 7 knots - Visibility: 8 statute miles - Lowest ceiling: none - Temperature: 81 °F, dew point 61 °F - Observed at: MFD ## 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 20040701017009A](https://openairdocs.org/incident/20040701017009A), Jul 1, 2004: Amtr STOL701, Mansfield, OH, Destroyed. (-23) After take off from runway 32 pilot noticed a loss of oil pressure. The pilot decided to return to the airport. Pilot landed runway 5 lost control of… 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.