# NTSB FTW03LA167: Manweiler Acro Sport II, N94SM, Bartlesville, OK, June 7, 2003 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: June 7, 2003, 12:09 local (17:09 UTC) - Place: Bartlesville, OK - Coordinates: 36.762222, -96.011108 - Nearby events: https://openairdocs.org/map.md?lat=36.7622&lon=-96.0111&mi=10 - Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report September 30, 2003 - Report: Approved by Office Director - Parties: OKC FSDO - NTSB case key (mKey): 57158 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW03LA167 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/57158/pdf - Page: https://openairdocs.org/ntsb/FTW03LA167 ## Probable cause The pilot's inadequate preflight inspection, which resulted in fuel exhaustion. A related factor was the lack of suitable terrain. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power(total) - nonmechanical, maneuvering - preflight planning/preparation - inadequate, pilot in command (contributing factor) - refueling - not performed, pilot in command (cause) - Forced landing, descent - emergency - On ground/water encounter with terrain/water, emergency landing - terrain condition - none suitable (contributing factor) - terrain condition - open field - Nose over, emergency landing ## Analysis An experimental home-built airplane, was substantially damaged during a forced landing following a total loss of engine power. The pilot stated that he requested fuel prior to departure from the Newton Country Airport (EWK). Fuel servicing was not performed on the aircraft as requested by the pilot. He departed without checking fuel quantity. He attempted an emergency landing in a field, where the airplane nosed over, and came to rest in the inverted position. ## Factual narrative On June 7, 2003, at 1209 central daylight time, a Manweiler Acro Sport II experimental home-built airplane, N94SM, was substantially damaged during a forced landing following a loss of engine power near Bartlesville, Oklahoma. The instrument rated private pilot and his passenger were not injured. The airplane, owned and operated by the pilot, was operating under 14 Code of Federal Regulations Part 91. Visual meteorological conditions prevailed for the personal flight for which a visual flight plan had not been filed. The local flight originated from the Bartlesville Airport (BVO), near Bartlesville, Oklahoma, approximately 1200. The 2,048-hour pilot reported that he had requested fuel prior to his departure from the Newton Country Airport (EWK). Fuel servicing was not performed on the aircraft as requested by the pilot, and the pilot departed without checking fuel quantity on-board his airplane. While on a formation flight with two other vintage airplanes, the engine loss power when the flight was about 6 miles from the BVO airport. The pilot stated that he performed all of the required actions necessary for an engine restart, but was unsuccessful. The pilot attempted a forced landing in an open hay field; however, the 3 foot tall grass "tripped the landing gear" and the tail-wheel equipped airplane nosed over, and came to rest in the inverted position. Examination of the wreckage revealed structural damage to the vertical stabilizer and rudder. The engine cowling and wooden propeller were also damaged. The pilot confirmed that the fuel system was empty. ## Aircraft - Registration: [N94SM](https://openairdocs.org/deregistered/N94SM-2018-04-18), registration cancelled 2018-04-18, S/N 733, built 1994 (OpenAirDocs) - Reported make and model: Manweiler Acro Sport II - Registry model: [Manweiler Steven R ACRO SPORT II](https://openairdocs.org/model/manweiler-steven-r-acro-sport-ii) (registry code 05624N8) (OpenAirDocs) - Registry engine: [Lycoming I0360 SER A&C](https://openairdocs.org/engine/lycoming-i0360-ser-a-c) (registry code 41511, reciprocating) (OpenAirDocs) - Category: Airplane, amateur-built - Serial number: 733 - Engines: Lycoming IO-360-AIA 200 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Steven R Manweiler - Airworthiness certificate: Special, Experimental (Special) - Departed: BVO, Bartlesville, OK ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 58; injuries: none; private; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 3, valid medical--w/ waivers/lim; last flight review July 18, 2002; seat: rear; flight hours: 2,048 total, 511 in this make and model, 1,907 as pilot in command, 12 in the last 90 days, 8 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 310° at 8 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 75 °F, dew point 57 °F - Altimeter: 29.89 inHg - Observed at: BVO ## 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 20030607012509A](https://openairdocs.org/incident/20030607012509A), Jun 7, 2003: Amtr ACROSPORTII, Bartlesville, OK, Substantial damage. (-23) The aircraft departed Bartlesville municipal airport (bvo) Bartlesville, OK at 1147 am local time for a local flight. While in flight for about ten… ## Other investigations on N94SM (1) 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. - [NTSB CEN14LA507](https://openairdocs.org/ntsb/CEN14LA507), Sep 20, 2014: Manweiller Acro Sport II (N94SM), Middletown, OH, substantial damage, 2 fatal. Probable cause: The failure of the flying pilot to maintain airplane control after an aerodynamic stall/spin occurred during the aerobatic maneuver following a reported intermittent loss of engine power for reasons… 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.