# NTSB CHI05CA005: Buss Rotorway Exec, N82DR, Eden Prairie, MN, October 9, 2004 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: October 9, 2004, 08:22 local (13:22 UTC) - Place: Eden Prairie, MN - Coordinates: 44.82722, -93.457221 - Nearby events: https://openairdocs.org/map.md?lat=44.8272&lon=-93.4572&mi=10 - Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report December 3, 2004 - Report: Approved by Office Director - Parties: Minneapolis, MN, FSDO - NTSB case key (mKey): 60311 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI05CA005 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/60311/pdf - Page: https://openairdocs.org/ntsb/CHI05CA005 ## Probable cause The pilot's inadvertent deactivation of the battery switch leading to the helicopter's loss of engine power on base leg. A factor was the crops he encountered during the emergency landing. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power(total) - nonmechanical, approach - vfr pattern - base leg/base to final - electrical system,electric switch - other - miscellaneous - inadvertent deactivation, pilot in command (cause) - Forced landing, emergency descent/landing - On ground/water encounter with terrain/water, emergency landing - terrain condition - crop (contributing factor) - terrain condition - ground ## Analysis The experimental amateur-built helicopter sustained substantial damage on impact with terrain during an autorotation following an in-flight loss of engine power while on its base leg. The pilot stated in his accident report, "I was given clearance for the option and on the base leg I reached for, and pulled, the carburetor heat lever. After releasing the lever, I inadvertently bumped and threw the main battery switch. I felt the switch move. (These switches are located on the top of the center console, and they are hidden from view by the pilot's right leg due to cramped quarters). I then tried to find and reengage the switch and I threw the avionics switch. I immediately re-engaged the avionics switch. While searching for the battery switch, the engine stopped. ... Due to forward groundspeed, the helicopter slid forward and tipped forward. The rotor blades struck the ground in the front of the ship, which created torque forces, which tipped the machine onto its left side. " The pilot reported that there were no mechanical malfunctions in reference to the helicopter on the flight. The pilot's safety recommendation was that the "battery switch should be relocated or [guarded]." ## Factual narrative On October 9, 2004, about 0822 central daylight time, an experimental amateur-built Buss Rotorway Exec helicopter, N82DR, operated by a commercial pilot, sustained substantial damage on impact with terrain during an autorotation following an in-flight loss of engine power while on its base leg to runway 28L at Flying Cloud Airport (FCM), near Eden Prairie, Minnesota. The personal flight was operating under 14 CFR Part 91. Visual meteorological conditions prevailed at the time of the accident. No flight plan was on file. The pilot reported no injuries. The local flight originated from FCM. The pilot stated in his accident report: I launched at 08:15 from General Aviation Services at Flying Cloud Airport, Eden Prairie, MN. I was given clearance to runway 28L. Upon take off clearance I commenced flying left pattern. I was given clearance for the option and on the base leg I reached for, and pulled, the carburetor heat lever. After releasing the lever, I inadvertently bumped and threw the main battery switch. I felt the switch move. (These switches are located on the top of the center console, and they are hidden from view by the pilot's right leg due to cramped quarters). I then tried to find and reengage the switch and I threw the avionics switch. I immediately re-engaged the avionics switch. While searching for the battery switch, the engine stopped. (The switch had shut off the fuel pumps, enabling the engine to continue running for a few seconds) I immediately lowered the collective and went into auto-rotation. I picked my spot to land and auto-rotated to that spot, and then initiated my cyclic flare. Just before touchdown I leveled the machine and pulled in all of the collective. I landed level, fairly softly, but with forward ground speed, in a soybean field diagonal to the rows. Calm winds were not a factor. Due to forward groundspeed, the helicopter slid forward and tipped forward. The rotor blades struck the ground in the front of the ship, which created torque forces, which tipped the machine onto its left side. The tower contacted me and confirmed that I was uninjured. I unbuckled my harness, shut off the fuel and all switches. I climbed out the passenger door. The pilot reported that there were no mechanical malfunctions in reference to the helicopter on the flight. The pilot's safety recommendation was that the "battery switch should be relocated or [guarded]." ## Aircraft - Registration: [N82DR](https://openairdocs.org/deregistered/N82DR-2008-04-25), registration cancelled 2008-04-25, S/N 1, built 1987 (OpenAirDocs) - Reported make and model: Buss Rotorway Exec - Registry model: [Rybolt Donald F DR EXEC](https://openairdocs.org/model/rybolt-donald-f-dr-exec) (registry code 13017EE) (OpenAirDocs) - Registry engine: [Amateur-built UNKNOWN ENG](https://openairdocs.org/engine/amateur-built-unknown-eng) (registry code 99999) (OpenAirDocs) - Category: Helicopter, amateur-built - Serial number: 1 - Airframe hours: 328 - Engines: Rotorway RW152 145 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Richard S. Buss - Airworthiness certificate: Special, Experimental (Special) - Departed: FCM, Eden Prairie, MN ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 57; injuries: none; commercial; medical: class 2, valid medical--w/ waivers/lim; last flight review January 16, 2004; seat: left; flight hours: 228 total, 52 in this make and model, 153 as pilot in command ## Weather - Conditions: Visual (VMC), Day - Wind: 0° at 0 knots - Visibility: 9 statute miles - Lowest ceiling: 25,000 ft broken - Temperature: 45 °F, dew point 39 °F - Altimeter: 30.20 inHg - Observed at: FCM, 1 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 20041009029329A](https://openairdocs.org/incident/20041009029329A), Oct 9, 2004: Amtr EXEC, Minneapolis, MN, Substantial damage. (-23) Pilot accidentally hit master switch on final, thereby shutting off electric fuel pump with subsequent loss of power. 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.