# NTSB WPR11CA360: Aircraft Mfg & Design CH750 Stol, N799US, New Washoe City, NV, August 10, 2011 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: August 10, 2011, 08:30 local (15:30 UTC) - Place: New Washoe City, NV - Coordinates: 39.252498, -119.76889 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=39.2525&lon=-119.7689&mi=10 - Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping) - Defining event: [Maneuvering-low-alt flying: Loss of control in flight](https://openairdocs.org/ntsb-events/240) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report October 17, 2011 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: Federal Aviation Administration - NTSB case key (mKey): 81360 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR11CA360 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/81360/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=81360 - Page: https://openairdocs.org/ntsb/WPR11CA360 ## Probable cause The pilot under instruction's control interference and the CFI's inadequate supervision of the flight. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Info processing/decision: identification/recognition](https://openairdocs.org/ntsb-findings/02041510): Personnel issues › Action/decision · Instructor/check pilot (probable cause); cases with it: [Aircraft Mfg & Design CH750 STOL, 1 case](https://openairdocs.org/ntsb-findings/02041510/cases.md?model=060006P), [All aircraft, 559 cases](https://openairdocs.org/ntsb-findings/02041510/cases.md) - [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Student/instructed pilot (probable cause); cases with it: [Aircraft Mfg & Design CH750 STOL, 1 case](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=060006P), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md) - [Performance/control parameters: airspeed](https://openairdocs.org/ntsb-findings/01062010): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Aircraft Mfg & Design CH750 STOL, 1 case](https://openairdocs.org/ntsb-findings/01062010/cases.md?model=060006P), [All aircraft, 1,681 cases](https://openairdocs.org/ntsb-findings/01062010/cases.md) - [Performance/control parameters: pitch control](https://openairdocs.org/ntsb-findings/01062022): Aircraft › Aircraft oper/perf/capability · Incorrect use/operation (probable cause); cases with it: [Aircraft Mfg & Design CH750 STOL, 1 case](https://openairdocs.org/ntsb-findings/01062022/cases.md?model=060006P), [All aircraft, 526 cases](https://openairdocs.org/ntsb-findings/01062022/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Maneuvering-low-alt flying: Loss of control in flight](https://openairdocs.org/ntsb-events/240) (defining event); cases with it: [Aircraft Mfg & Design CH750 STOL, 1 case](https://openairdocs.org/ntsb-events/240/sequence.md?model=060006P), [All aircraft, 5,002 cases](https://openairdocs.org/ntsb-events/240/sequence.md) - [Maneuvering-low-alt flying: Attempted remediation/recovery](https://openairdocs.org/ntsb-events/060); cases with it: [Aircraft Mfg & Design CH750 STOL, 1 case](https://openairdocs.org/ntsb-events/060/sequence.md?model=060006P), [All aircraft, 1,422 cases](https://openairdocs.org/ntsb-events/060/sequence.md) - [Maneuvering-low-alt flying: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Aircraft Mfg & Design CH750 STOL, 1 case](https://openairdocs.org/ntsb-events/470/sequence.md?model=060006P), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis The pilot under instruction (PUI) and certified flight instructor (CFI) were practicing slow flight at approximately 200 feet above ground level when the CFI noticed that the airplane was sinking and the airspeed was low. He instructed the PUI to add power in order to maintain altitude; the PUI did, but the airplane continued to sink. The CFI then added more power and pitched the nose up in an attempt to gain altitude and arrest the sink, but in response, the PUI pushed the nose down and the airplane made an inadvertent landing, bouncing twice and coming to rest inverted. The airplane's firewall and vertical stabilizer were substantially damaged. The CFI reported no preimpact mechanical malfunctions or failures that would have precluded normal operations. ## Factual narrative The pilot under instruction (PUI) and certified flight instructor (CFI) were practicing slow flight at approximately 200 feet above ground level when the CFI noticed that the airplane was sinking and the airspeed was low. He instructed the PUI to add power in order to maintain altitude; the PUI did, but the airplane continued to sink. The CFI then added more power and pitched the nose up in an attempt to gain altitude and arrest the sink, but in response, the PUI pushed the nose down and the airplane made an inadvertent landing, bouncing twice and coming to rest inverted. The airplane's firewall and vertical stabilizer were substantially damaged. The CFI reported no preimpact mechanical malfunctions or failures that would have precluded normal operations. ## Aircraft - Registration: [N799US](https://openairdocs.org/aircraft/N799US), registered now, S/N 750-003 (OpenAirDocs) - Reported make and model: Aircraft Mfg & Design LLC CH750 STOL - Registry model: [Aircraft Mfg & Design CH750 STOL](https://openairdocs.org/model/aircraft-mfg-design-ch750-stol) (registry code 060006P) (OpenAirDocs) - Category: Airplane - Serial number: 750-003 - Airframe hours: 53 - Engines: Continental O-200 100 horsepower reciprocating - Damage: Substantial damage - Flight: Instructional, Part 91 - Operator: Buzz Air Flight Academy LLC - Registered owner: APR Aircraft LLC - Airworthiness certificate: Special, Special light-sport (Special) - Last inspection: AAIP, June 13, 2011 - Departed: KCPX, Carson Airport, NV - Destination: KCPX, Carson Airport, NV - Flight plan: Unknown - Airport: NONE, None ## Flight crew As NTSB recorded them. NTSB leaves out names. - Flight instructor; age 57; injuries: none; flight instructor; airplane ratings: single-engine land; medical: class 3, with waivers/limitations; last flight review May 25, 2010; seat: right; flight hours: 1,500 total, 60 in this make and model, 1,300 as pilot in command, 70 in the last 90 days, 40 in the last 30 days, 20 in the last 24 hours - Pilot; age 76; injuries: none; commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; last flight review August 11, 2011; seat: left; flight hours: 4,000 total, 1 in this make and model, 10 in the last 30 days, 10 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 63 °F, dew point 32 °F - Observed at: KCPX, 4 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 20110810016699A](https://openairdocs.org/incident/20110810016699A), Aug 10, 2011: Aircraft Mfg & Design LLC CH750 STOL, Carson City, NV, Substantial damage. Commercial pilot, [privacy data omitted], was under instruction for a check out in a stol 750LS special light sport Aircraft by CFI elroy devoll, cert #… ## Docket (3 files) The files NTSB released with the investigation on August 19, 2011, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=81360. 857 KB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 378 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40352541&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF - Record of Conversation - Flight Instructor (item 2, .PDF, 49 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40352542&FileExtension=.PDF&FileName=Record%20of%20Conversation%20-%20Flight%20Instructor-Master.PDF - Photo 1 - Accident Airplane - Courtesy of FAA (item 3, .PDF, 430 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40352567&FileExtension=.PDF&FileName=Photo%201%20-%20Accident%20Airplane%20-%20Courtesy%20of%20FAA-Master.PDF 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.