# NTSB ATL03LA013: Aeronca 7AC, N83651, Warner Robins, GA, October 31, 2002 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Limited investigation · Final report - Date: October 31, 2002, 15:50 local (20:50 UTC) - Place: Warner Robins, GA - Coordinates: 32.621112, -83.599723 - Nearby events: https://openairdocs.org/map.md?lat=32.6211&lon=-83.5997&mi=10 - Phase of flight: [Standing](https://openairdocs.org/ntsb-phases/150) (OpenAirDocs' grouping) - Highest injury: Minor injuries - Injuries: 1 minor - Status: Completed, report November 25, 2003 - Report: Approved by Office Director - Parties: FAA Atlanta FSDO - 11 - NTSB case key (mKey): 56006 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ATL03LA013 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/56006/pdf - Page: https://openairdocs.org/ntsb/ATL03LA013 ## Probable cause The pilot's failure to follow engine start procedures for a overprimed engine, and his improper use of the throttle control during an attempted start. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of control - on ground/water, standing - starting engine(s) - throttle/power control - improper use of, pilot in command (cause) - starting procedure - not followed, pilot in command (cause) - On ground/water collision with object, other - object - hangar/airport building - object - aircraft parked/standing ## Analysis The pilot chocked the main wheel and followed the starting procedures, which included pulling the propeller through by hand. The pilot made several unsuccessful attempts to start the engine. He stated that he primed the engine, "cracked" the throttle, pulled the propeller through, and the engine started and spun up to high rpm. The airplane taxied off unmanned at high speed, dragging the pilot, then it collided with a hangar and a parked airplane. Examination of the cement pad where the wheel chock was found revealed a fresh fuel stain approximately eight feet long and four feet wide with several boot/shoe tracks through it. Federal Aviation Administration Advisory Circular AC165-12 states the corrective action for clearing an overprimed engine includes opening the throttle fully and turning the propeller to expel excess fuel. The pilot reported no mechanical malfunction with the airplane. ## Factual narrative On October 31, 2002, at 1550 eastern standard time, an Aeronca 7AC, N83651, registered to and operated by the commercial pilot, taxied unmanned and collided with a hangar and a parked airplane at Warner Robins Air Park in Warner Robins, Georgia. The personal flight was operated under the provisions of Title 14 CFR Part 91 with no flight plan filed. Visual meteorological conditions prevailed. The commercial pilot received minor injuries, and the airplane and a parked airplane sustained substantial damage. The local flight was originating from Warner Robins, Georgia, at the time of the accident. The pilot pulled the airplane out of the hangar, chocked a main wheel, and completed the preflight procedures with the intention of performing a currency flight in the pattern. Normal starting procedure for the airplane included turning the propeller by hand, because it was not equipped with an electric starter. The pilot performed the starting procedure three times without success. The pilot stated he next used the primer valve to prime the engine twice, then repeated the starting procedure, but the engine did not start. He stated he used the primer one more time, repeated the starting procedure with the throttle "cracked," and the engine started and spun up to high rpm. The pilot stated he "hurried to get inside to retard the throttle and/or switch off the mags," but the airplane lurched forward over the chock. The pilot was able to grab the rear control stick and was dragged by the airplane as it taxied off. The pilot stated he "felt the airplane wanting to fly," but he was able to push the control stick forward enough to keep the airplane on the ground. The airplane dragged the pilot around two or three circles, then the pilot let go of the control stick, fell to the ground, and the airplane's tailwheel ran over his right ankle. The airplane continued in a counter-clockwise ground loop, and the pilot again attempted to gain access to the cockpit, was struck in the head by the right wing strut, and fell to the ground. The pilot again attempted to gain control of the airplane, but it collided with a hangar and a parked airplane before coming to a stop. Examination of the airplane revealed damage to the propeller and wing spar, and the parked airplane sustained wing spar damage. Examination of the cement pad where the wheel chock was found revealed a fresh fuel stain approximately eight feet long and four feet wide with several boot/shoe tracks through it. A review of Federal Aviation Administration Advisory Circular AC165-12A, Chapter 10, Engine Maintenance and Operation, Reciprocating Engine Operation, Table 10, Troubleshooting Opposed Engines, revealed the corrective action for an engine that fails to start due to overpriming is, "Open throttle and 'unload' engine by rotating the propeller." The pilot reported no mechanical malfunction with the airplane. ## Aircraft - Registration: [N83651](https://openairdocs.org/aircraft/N83651), registered now, S/N 7AC-2329, built 1946 (OpenAirDocs) - Reported make and model: Aeronca 7AC - Registry model: [Aeronca 7AC](https://openairdocs.org/model/aeronca-7ac) (registry code 2110102) (OpenAirDocs) - Registry engine: [Continental A&C65 series](https://openairdocs.org/engine/continental-a-c65-series) (registry code 17003, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 7AC-2329 - Airframe hours: 5132 - Engines: Continental A-65-8 65 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Airworthiness certificate: Standard, Normal - Last inspection: Annual, November 2, 2001, 54 hours before - Departed: 5A2 - Destination: 5A2 - Airport: 5A2, Warner Robins Air Park, runway 27, 2,833 × 130 ft, grass/turf ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 50; injuries: minor; commercial; airplane ratings: single-engine land, single-engine sea; instrument ratings: airplane; medical: class 3, valid medical--no waivers/lim.; last flight review May 8, 2001; flight hours: 722 total, 500 in this make and model, 562 as pilot in command, 0 in the last 90 days, 0 in the last 30 days, 0 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 300° at 9 knots - Visibility: 10 statute miles - Temperature: 68 °F, dew point 46 °F - Altimeter: 30.05 inHg - Observed at: KMCN, 8 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 20021031037319A](https://openairdocs.org/incident/20021031037319A), Oct 31, 2002: Bbavia 7AC, Warner Robins, GA, Substantial damage. (-23) While hand propping the Aeronca/7AC, s/n 7AC-2329 for a flight. Mr. Shema stated "the aircraft started and jump the chalk he had under the right tire."… 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.