# NTSB CHI00LA109: Piper PA-11, N5548B, Sherwood, ND, April 11, 2000 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: April 11, 2000, 18:00 local (23:00 UTC) - Place: Sherwood, ND - Coordinates: 48.960369, -101.630012 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=48.9604&lon=-101.6300&mi=10 - Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report May 17, 2001 - Report: Approved by Office Director - NTSB case key (mKey): 48987 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI00LA109 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/48987/pdf - Page: https://openairdocs.org/ntsb/CHI00LA109 ## Probable cause carburetor ice and the pilot's improper decisions when to use carburetor heat and to perform a soft field landing. Factors relating to this accident were the improper use of carburetor heat, the soft field landing attempt, and the snow covered field. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power, maneuvering - fuel system,carburetor - ice (cause) - carburetor heat - improper use of, pilot in command (contributing factor) - in-flight planning/decision - inadequate, pilot in command (cause) - In flight collision with terrain/water, emergency descent/landing - soft field landing/procedure - attempted, pilot in command (contributing factor) - terrain condition - snow covered (contributing factor) ## Analysis The student pilot said that he was flying over his home to look for an area on which to put in an airstrip. 'When I was making an approach at one location, I added power to the plane and there was no power.' The pilot said he checked the carburetor heat and it was on. The pilot elected to set the airplane down on the field. 'As the plane was slowing down, the wheels dropped through the snow and the plane flipped on its back.' Examination of the airplane revealed no anomalies. The temperature and dew point reported at Minot International Airport, Minot, North Dakota (212 degrees and 51 nautical miles from the accident site) were 37 degrees Fahrenheit (F), and 19 degrees F. According to the DOT/FAA Publication CT- 82/44, Light Airplane Piston Engine Carburetor Ice Detector/Warning Device Sensitivity/Effectiveness, June 1982, with a temperature of 37 degrees F, and a dew point of 19 degrees F, the Carburetor Icing Probability Chart shows icing occurring at glide and cruise power. ## Factual narrative On April 11, 2000, at 1800 central daylight time (cdt), a Piper PA-11, N5548B, operated by a solo student pilot, sustained substantial damage when while maneuvering at low altitude and attempting to go around, the airplane impacted into a snow- covered field and subsequently nosed over, 4 miles east of Sherwood, North Dakota. Visual meteorological conditions prevailed at the time of the accident. The personal flight was being conducted under 14 CFR Part 91. There was no flight plan on file. The student pilot reported no injuries. The local flight originated at Westhope, North Dakota, at 1745 cdt. In his written statement, the student pilot said that he was flying over his home to look for an area on which to put in an airstrip. "When I was making an approach at one location, I added power to the plane and there was no power." The pilot said he checked the carburetor heat and it was on. The pilot elected to set the airplane down on the field. "As the plane was slowing down, the wheels dropped through the snow and the plane flipped on its back." A Federal Aviation Administration (FAA) inspector examined the airplane at the student pilot's farm. The engine, engine mounts and firewall were bent upward and aft. The propeller was bent aft. The right wing was bent upward. Both wing struts were broken. The vertical stabilizer and rudder were crushed downward. Examination of the airplane's engine, engine controls and other airplane systems revealed no anomalies. At 1748 cdt, the weather conditions reported at Minot International Airport, Minot, North Dakota (212 degrees and 51 nautical miles from the accident site) were 15,000 feet broken ceiling, 15 miles visibility, temperature 37 degrees Fahrenheit (F), dew point 19 degrees F, winds 310 degrees at 7 knots, and altimeter setting of 30.38 inches of Mercury. According to the Department of Transportation/FAA Publication CT- 82/44, Light Airplane Piston Engine Carburetor Ice Detector/ Warning Device Sensitivity/Effectiveness, June 1982, with a temperature of 37 degrees F, and a dew point of 19 degrees F, the Carburetor Icing Probability Chart shows icing occurring at glide and cruise power. ## Aircraft - Registration: [N5548B](https://openairdocs.org/aircraft/N5548B), registered now, S/N 11-1053, built 1949 (OpenAirDocs) - Reported make and model: Piper PA-11 - Registry model: [Piper PA-11](https://openairdocs.org/model/piper-pa-11) (registry code 7101102) (OpenAirDocs) - Registry engine: [Continental C90 series](https://openairdocs.org/engine/continental-c90-series) (registry code 17009, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 11-1053 - Airframe hours: 1482 - Engines: Continental C-90 90 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Arlyn Keith - Airworthiness certificate: Standard, Normal - Last inspection: Annual, February 9, 2000, 20 hours before - Departed: D64, WESTHOPE, ND ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 49; student; medical: class 3, valid medical--w/ waivers/lim; seat: front; flight hours: 28 total, 28 in this make and model, 28 in the last 90 days, 15 in the last 30 days, 4 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 310° at 7 knots - Visibility: 15 statute miles - Lowest ceiling: 15,000 ft broken - Temperature: 37 °F, dew point 19 °F - Altimeter: 30.00 inHg - Observed at: MOT, 42 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 20000411042879A](https://openairdocs.org/incident/20000411042879A), Apr 11, 2000: Piper PA11, Sherwood, ND, Substantial damage. (-23) On 4-11-00 at 1800, a Piper PA-11 registered to arlyn keith was involved in an accident while making a low approach to the pilot's farm field 4.5 miles… 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.