# NTSB ATL05CA122: Aeronca C3, N14532, Summerville, SC, July 4, 2005 - Type: NTSB accident investigation - Classification: Accident · Serious injuries · Data collection · Final report - Date: July 4, 2005, 14:30 local (18:30 UTC) - Place: Summerville, SC - Coordinates: 33.060832, -80.223609 - Nearby events: https://openairdocs.org/map.md?lat=33.0608&lon=-80.2236&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: Serious injuries - Injuries: 2 serious - Status: Completed, report October 27, 2005 - Report: Approved by Office Director - Parties: FSDO 13 Columbia - NTSB case key (mKey): 61859 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ATL05CA122 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/61859/pdf - Page: https://openairdocs.org/ntsb/ATL05CA122 ## Probable cause The maintenance personnel failure to secure the intake valve adjustment jam nut which resulted in excessive valve clearance, and the subsequent 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, cruise - engine assembly,valve,intake - clearance (cause) - maintenance,adjustment - improper, other maintenance personnel (cause) - engine assembly,valve,intake - exceeded - miscellaneous,engine - not secured (cause) - Forced landing, descent - emergency - In flight collision with object, landing - stall - intentional, pilot in command - object - tree(s) ## Analysis Approximately 25 minutes into the flight the pilot reported a smooth engine RPM drop from 2400 to 1000. The pilot selected an area for an emergency landing. During the emergency landing attempt, the pilot was forced to land in the canopy of a near by stand of trees. The post-accident examination of the engine revealed that the clearance between the rocker arm and valve stem was excessive. The jam nut backed off due to maintenance personnel failure to secure the jam nut. A review of the airplane maintenance log revealed that the valve assembly was last adjusted on November 24, 2004. ## Factual narrative On July 4, 2005, at 1430 eastern daylight time, an Aeronca C3, N14532, registered to and operated by a private owner, collided with trees and subsequently the ground five miles south of Summerville Airport, Summerville, South Carolina. The flight was operated under provisions of Title 14 CFR Part 91. Visual meteorological conditions prevailed at the time of the accident and a flight plan was not filed. The airplane sustained substantial damage, the private pilot and passenger received serious injuries. The flight originated from Summerville Airport, Summerville, South Carolina, on July 4, 2005 at approximately 1400. According to the pilot, he and his wife were taking their restored 1935 Aeronca C-3 for a pleasure flight. Approximately 25 minutes into the flight the pilot reported a smooth engine RPM drop from 2400 to 1000. The pilot selected "Jedburg Airport (old Summerville airport)" for an emergency landing. The pilot entered the traffic pattern at 500 feet, but another airplane was on the runway. The pilot began to make a 360 degree turn for spacing, but decide that he did not have enough altitude to complete the turn. The pilot elected to make an off airport landing onto the canopy of a near by stand of trees. Before hitting the trees the pilot stated that he intentionally stalled the airplane. The post-accident examination of the airplane revealed left and right wing circular crush damage. Post-accident examination of the engine revealed that the intake valve clearance was out of adjustment. The clearance between the rocker arm and valve stem exhibited excess clearance. Further investigation revealed that the intake valve would not open because the mechanical pushrod lifter was out of adjustment. The intake lifter adjustment jam nut was loose and the lifter adjustment had bottom out. The intake lifter would not allow proper travel of the pushrod and rocker arm. The rocker arm could not compress/open the intake valve. A review of the airplane maintenance log revealed that the valve assembly was last adjusted on November 24, 2004. ## Aircraft - Registration: [N14532](https://openairdocs.org/aircraft/N14532), registered now, S/N A-441, built 1935 (OpenAirDocs) - Reported make and model: Aeronca C3 - Registry model: [Aeronca C-3](https://openairdocs.org/model/aeronca-c-3) (registry code 0190302) (OpenAirDocs) - Registry engine: [Aeronca E113 series](https://openairdocs.org/engine/aeronca-e113-series) (registry code 01002, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: A-441 - Airframe hours: 600 - Engines: Aeronca E-113B 36 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Anthony J. Chipas - Registered owner: Anthony J Chipas - Airworthiness certificate: Standard, Normal - Last inspection: Annual, June 1, 2005, 1.6 hours before - Departed: SUMMERVILLE, SC - Destination: Summerville, SC - Flight plan: Unknown - Airport: DYB, Dorchester County, runway 24, 3,701 × 75 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 54; injuries: serious; private; airplane ratings: single-engine land; medical: class 3, with waivers/limitations; last flight review May 1, 2004; seat: left; flight hours: 950 total, 10 in this make and model, 950 as pilot in command ## Weather - Conditions: Visual (VMC), Day - Wind: 230° at 9 knots - Visibility: 6 statute miles - Lowest ceiling: none - Temperature: 90 °F, dew point 77 °F - Altimeter: 30.06 inHg - Observed at: CHS, 15 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 20050704014549A](https://openairdocs.org/incident/20050704014549A), Jul 4, 2005: Aronca C3AERONCA, Summerville, SC, Substantial damage. (-23) Pilot stated after flying for 25 minutes and at an altitude of 950' feet MSL the aircraft lost power. The tachometer dropped from 2,400 RPM to 1,000 RPM.… 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.