# NTSB NYC93LA128: Enstrom F-28A, N9555, Ironton, OH, June 27, 1993 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: June 27, 1993, 14:00 local (18:00 UTC) - Place: Ironton, OH - Coordinates: 38.529014, -82.670341 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=38.5290&lon=-82.6703&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report June 30, 1994 - Report: Approved by Office Director - NTSB case key (mKey): 38612 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=NYC93LA128 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/38612/pdf - Page: https://openairdocs.org/ntsb/NYC93LA128 ## Probable cause THE LOSS OF ENGINE POWER FOR UNDETERMINED REASONS. THE LACK OF SUITABLE TERRAIN FOR THE FORCED LANDING WAS A FACTOR. ## 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 - Forced landing, descent - emergency - On ground/water collision with object, landing - object - tree(s) - terrain condition - none suitable (contributing factor) ## Analysis THE INSTRUCTOR AND STUDENT WERE CRUISING IN THE HELICOPTER AT ABOUT 1000 FEET ABOVE THE TERRAIN, WHEN, ACCORDING TO THE INSTRUCTOR, 'THE ENGINE BEGAN TO MISS, CAUSING [A] VIOLENT YAW. [I] IMMEDIATELY WRAPPED THE THROTTLE OFF AND LOWERED THE COLLECTIVE.' THE PILOT INITIATED AN AUTOROTATION INTO A YARD NEAR A HOUSE. THE TAIL ROTOR STRUCK A TREE DURING THIS MANEUVER. AN EXAMINATION OF THE ENGINE REVEALED NO DISCREPANCIES, AND THE ENGINE WAS SUCCESSFULLY RUN AT A TEST FACILITY. ## Factual narrative On Sunday, June 27, 1993, at 1400 eastern daylight time, an Enstrom F 28A, N9555, registered to Hier Aviation, Inc., and piloted by Daniel R. Hieronimus, sustained substantial damage during a forced landing in Ironton, Ohio. The certified flight instructor and student pilot were not injured. Visual meteorological conditions prevailed, and no flight plan was filed. The flight was being conducted under 14 CFR 91. The pilot stated, "While flying at approximately 15-1800' MSL the engine began to miss causing violent yaw. [I] immediately wrapped the throttle off and lowered the collective and advised [the student] that we were going ... to land." The pilot performed an autorotation to a yard near a house. During this maneuver, the pilot had to modify the flight path in order to avoid power lines and personnel on the ground, and the tail struck a tree. Mr. Stanley P. Faske, Principal Maintenance Inspector for the Federal Aviation Administration, conducted an examination of the helicopter. In his report, Mr. Faske stated: At the accident site, the engine was inspected and nothing was found which would have prevented the engine from producing power. On August 24, 1993 N9555 was test run.... The engine ran normally and produced power throughout all RPM ranges. ## Aircraft - Registration: [N9555](https://openairdocs.org/deregistered/N9555-2022-01-08), registration cancelled 2022-01-08, S/N 062, built 1971 (OpenAirDocs) - Reported make and model: ENSTROM F-28A - Registry model: [Enstrom F-28A](https://openairdocs.org/model/enstrom-f-28a) (registry code 3300406) (OpenAirDocs) - Registry engine: [Lycoming I0360 series](https://openairdocs.org/engine/lycoming-i0360-series) (registry code 41515, reciprocating) (OpenAirDocs) - Category: Helicopter - Serial number: 062 - Engines: LYCOMING HIO-360 205 horsepower reciprocating - Damage: Substantial damage - Flight: Instructional, Part 91 - Registered owner: Hier Aviation, Inc. - Airworthiness certificate: Standard, Normal - Last inspection: Annual, February 15, 1993, 70 hours before - Departed: HTW, LAWRENCE, OH ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 44; commercial, flight instructor; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: right; flight hours: 2,810 total, 310 in this make and model, 27 in the last 90 days, 15 in the last 30 days, 3 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 220° at 6 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 86 °F, dew point 54 °F - Altimeter: 29.00 inHg - Observed at: HTS, 3 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 19930627020689A](https://openairdocs.org/incident/19930627020689A), Jun 27, 1993: Enstrm F28A, Ironton, OH, Substantial damage. Reported engine miss. Tail rotor struck trees on reported precautionary landing. No anomalies found. 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.