# NTSB MIA99LA025: Ercoupe 415-C, N99924, Hartselle, AL, October 31, 1998 - Type: NTSB accident investigation - Classification: Accident · Serious injuries · Limited investigation · Final report - Date: October 31, 1998, 13:30 local (19:30 UTC) - Place: Hartselle, AL - Coordinates: 34.429134, -86.929824 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=34.4291&lon=-86.9298&mi=10 - Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping) - Highest injury: Serious injuries - Injuries: 1 serious - Status: Completed, report August 3, 1999 - Report: Approved by Office Director - NTSB case key (mKey): 45191 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA99LA025 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/45191/pdf - Page: https://openairdocs.org/ntsb/MIA99LA025 ## Probable cause Improper modification of the carburetor float by maintenance personnel resulting in the float sticking in the full needle valve open position and failure of the engine due to excessive fuel flow. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power(total) - mech failure/malf, approach - vfr pattern - downwind - fuel system,carburetor float - movement restricted - maintenance,modification - improper, other maintenance personnel (cause) - fluid,fuel - excessive flow/output - Forced landing, emergency descent/landing - In flight collision with object, emergency descent/landing - object - wire,transmission - In flight collision with terrain/water, descent - uncontrolled - terrain condition - ground ## Analysis The engine lost power as the pilot turned onto the downwind leg for landing. As the pilot approached a field for landing, the aircraft collided with a power line and then the ground. Postcrash examination of the engine showed it was operating with an excessive rich fuel mixture. The carburetor float was found stuck in the full needle valve open position due to excessive solder on the float fulcrum contacting the bowl wall. The carburetor had been recently modified by installing a new style needle valve, which also required the addition of weight to the float fulcrum with solder. ## Factual narrative On October 31, 1998, about 1330 central standard time, an Ercoupe 415-C, N99924, registered to an individual, collided with a power line and crashed in a field while making a forced landing following loss of engine power at Hartselle, Alabama, while on a Title 14 CFR Part 91 personal flight. Visual meteorological conditions prevailed at the time and no flight plan was filed. The aircraft received substantial damage and the private-rated pilot received serious injuries. The flight originated from Roundtree Field, Hartselle, Alabama, about 1245. The pilot stated this was the first flight since extensive repairs and restoration to the aircraft. After takeoff he departed the airport traffic pattern and climbed to 3,500 feet. He performed maneuvers for about 30 minutes and then returned to the airport traffic for takeoffs and landings. After the second landing, he again took off. As he turned onto the downwind leg, the engine quit without warning. A quick attempt to restart the engine was unsuccessful. He selected a landing site for a forced landing and turned toward it. He was unable to maintain sufficient altitude to clear a power line and the aircraft collided with it, causing the aircraft to nose down. The aircraft then impacted a ditch and bounced and landed on the landing gear, from which a normal landing roll was made. Postcrash examination of the engine was performed by FAA inspectors. The spark plugs were found to have black soot deposits. The exhaust system also had black soot deposits. The engine was started and operated at idle power for a short time before quitting. A higher engine power was not attempted due to a fuel leak from fuel line damage during ground impact. The Bendix-Stromberg float carburetor was removed from the engine by FAA inspectors and taken to an overhaul facility. The float was found stuck in the full needle valve open position. Excessive solder on the float fulcrum was contacting the edge of the bowl causing it to stick. The carburetor had been modified in accordance with Bendix-Stromberg Service Bulletin 84 which calls for installation of a new style needle valve which in turn calls for adding of solder weight to the float fulcrum. The service bulletin warns that the added weight should not interfere with the movement of the float. (See attached FAA inspector report) ## Aircraft - Registration: [N99924](https://openairdocs.org/aircraft/N99924), registered now, S/N 2547, built 1946 (OpenAirDocs) - Reported make and model: Ercoupe (Eng & Research Corp.) 415-C - Registry model: [Ercoupe 415-D](https://openairdocs.org/model/ercoupe-415-d) (registry code 0420326) (OpenAirDocs) - Registry engine: [Continental C85 series](https://openairdocs.org/engine/continental-c85-series) (registry code 17008, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 2547 - Airframe hours: 1202 - Engines: Continental C75-12 85 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Melborne D. Thrasher - Airworthiness certificate: Standard, Normal - Last inspection: Annual, October 31, 1998, 1 hours before - Departed: 5M0 - Flight plan: Unknown ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 60; private; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 609 total, 41 in this make and model, 507 as pilot in command, 10 in the last 90 days, 6 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 350° at 7 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 79 °F, dew point 45 °F - Altimeter: 30.00 inHg - Observed at: HSV, 20 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 19981031031179A](https://openairdocs.org/incident/19981031031179A), Oct 31, 1998: Univar 415C, Hartselle, AL, Substantial damage. (.19)On October 31, 1998, about 1335 central standard time, a Ercoupe 415-C, N99924, registered to an individual, collided with a power line and crashed in a… 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.