# NTSB MIA96LA205: Hampson Velocity, N637KM, Dublin, GA, August 6, 1996 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: August 6, 1996, 18:20 local (22:20 UTC) - Place: Dublin, GA - Coordinates: 32.530178, -82.919563 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=32.5302&lon=-82.9196&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 3 uninjured - Status: Completed, report May 23, 1997 - Report: Approved by Office Director - NTSB case key (mKey): 38067 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA96LA205 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/38067/pdf - Page: https://openairdocs.org/ntsb/MIA96LA205 ## Probable cause the failure of the exhaust of the cylinder Nos. 2 and 4 at each exhaust flange for undetermined reasons. The unsuitable terrain encountered during 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 - normal - exhaust system,stack - undetermined (cause) - exhaust system,stack - separation - Nose over, emergency descent/landing - terrain condition - none suitable (contributing factor) ## Analysis While en route the pilot first heard engine roughness, then observed high oil temperature indication and experienced momentary binding of the aileron flight controls. The engine oil temperature reached the maximum red line and also the engine began to run rough. He performed a forced landing in a field and during the landing roll, the nose landing gear separated and the airplane nosed over. Examination of the engine by the FAA airworthiness inspector revealed that the exhaust for the Nos. 2 and 4 cylinders were separated at the flange at the cylinder. The exhaust was manufactured by Velocity using owner/pilot purchased 16 gauge 304 stainless steel and was installed about 96 hours earlier. No determination could be made as to the reason for the failure of the exhaust. ## Factual narrative On August 6, 1996, about 1820 eastern daylight time, a homebuilt Velocity, N637KM, registered to a private individual, nosed over during a precautionary landing in a field near Dublin, Georgia. Visual meteorological conditions prevailed at the time and no flight plan was filed for the 14 CFR Part 91 personal flight. The airplane was substantially damaged and the commercial-rated pilot, and two passengers were not injured. The flight originated about 1700 from the Cobb County-McCollum Field Airport, Marietta, Georgia. The pilot stated to an FAA inspector that en route he first heard engine roughness then observed high oil temperature and experienced momentary binding of the aileron flight controls. The engine began to run rough and the oil temperature reached maximum red line. He initiated a forced landing in a cotton field and after touchdown, the nose gear and a section of the left wing separated. The airplane then nosed over and came to rest inverted. Examination of the engine by the FAA inspector revealed that the exhaust for the Nos. 2 and 4 cylinders were separated at the flange at each cylinder. The exhaust was manufactured by Velocity using 16 gauge 304 stainless steel purchased by the owner/pilot and was installed about 96 hours earlier. No determination was made as to the reason for the failure of the exhaust. ## Aircraft - Registration: [N637KM](https://openairdocs.org/aircraft/N637KM), registered now, S/N DMO-63, built 1993 (OpenAirDocs) - Reported make and model: Hampson VELOCITY - Registry model: [Hampson Michael C VELOCITY](https://openairdocs.org/model/hampson-michael-c-velocity) (registry code 05618B9) (OpenAirDocs) - Registry engine: [Lycoming I0360 series](https://openairdocs.org/engine/lycoming-i0360-series) (registry code 41515, reciprocating) (OpenAirDocs) - Category: Airplane, amateur-built - Serial number: DMO-63 - Airframe hours: 331 - Engines: Lycoming IO360-B1B 180 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Michael C. Hampson - Airworthiness certificate: Special, Experimental (Special) - Departed: RYY, MARIETTA, GA - Destination: FPR, FT. PIERCE, FL ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 49; commercial; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 595 total, 250 in this make and model, 595 as pilot in command ## Weather - Conditions: Visual (VMC), Day - Wind: 80° at 6 knots - Visibility: 15 statute miles - Lowest ceiling: 15,000 ft overcast - Temperature: 86 °F, dew point 77 °F - Altimeter: 30.00 inHg - Observed at: AMG, 10 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 19960806021079A](https://openairdocs.org/incident/19960806021079A), Aug 6, 1996: Amtr VELOCITY, Dublin, GA, Substantial damage. Pilot reported that the engine was running rough and he made an emergency landing in a cotton field. 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.