# NTSB FTW98LA197: Rockwell 690B, N690ES, Broomfield, CO, April 24, 1998 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: April 24, 1998, 14:05 local (20:05 UTC) - Place: Broomfield, CO - Coordinates: 39.890876, -105.110809 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=39.8909&lon=-105.1108&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report February 15, 2001 - Report: Approved by Office Director - NTSB case key (mKey): 20587 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW98LA197 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/20587/pdf - Page: https://openairdocs.org/ntsb/FTW98LA197 ## Probable cause Failure of the flight instructor to maintain adequate supervision, and failure of the pilot receiving instruction to maintain directional control that was lost for reasons undetermined. A factor was the concrete culvert. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Airframe/component/system failure/malfunction, landing - roll - reason for occurrence undetermined (cause) - Loss of control - on ground/water, landing - roll - directional control - not maintained, dual student (cause) - supervision - inadequate, pilot in command(cfi) (cause) - On ground/water collision with object, landing - roll - object - other (contributing factor) ## Analysis The pilot-owner said that after landing, he brought the condition levers from ground idle to reverse. The airplane veered to the right, as if 'one engine was developing more power than the other.' The instructor pilot took control and attempted to straighten the airplane but it departed the runway and struck a concrete culvert. The left landing gear collapsed, and the tip from one of the left propeller blades penetrated the pressure vessel. The right propeller and right and nose landing gears also sustained damage. During repairs, no abnormalities were found with either the propeller, pitch, or Bendix controllers. ## Factual narrative On April 24, 1998, at 1405 mountain daylight time, a Rockwell International 690B, N690ES, was substantially damaged during landing at Broomfield, Colorado. The private certificated pilot receiving instruction and the airline transport rated flight instructor were not injured. Visual meteorological conditions prevailed, and no flight plan was filed for the instructional flight being conducted under Title 14 CFR Part 91. The flight originated at Boulder, Colorado, approximately 1330. According to the pilot-owner, he had recently purchased the airplane and had contracted with the instructor pilot to give him instruction and a checkout in the airplane. Although he was multiengine rated and had owned other multiengine airplanes, this was his first experience with a turboprop airplane. The two pilots flew the airplane from Oklahoma City, Oklahoma, to Boulder, Colorado, where they landed and had lunch. After lunch, they flew to the Jefferson County (Jeffco) Airport, Broomfield, Colorado, to make some full stop landings. The first two landings were without incident. The pilot-owner said that after the third landing, he brought the condition levers from ground idle to reverse. The airplane veered to the right and departed the runway. The instructor pilot took control and attempted to straighten the airplane, but it struck a concrete culvert. The pilot-owner said that it appeared that "one engine was developing more power than the other. This could be the result of a faulty propeller governor, the pitch controller, or possibly the Bendix controller." According to an FAA inspector who examined the airplane, the left landing gear collapsed, and the tip from one of the left propeller blades penetrated the pressure vessel. The right propeller and right and nose landing gears also sustained damage. The airplane was ferried back to Commander Aircraft at Downtown Airpark in Oklahoma City, Oklahoma, for repairs. According to the company's director of maintenance, no abnormalities were found with either the propeller, pitch, or Bendix controllers. ## Aircraft - Registration: [N690ES](https://openairdocs.org/deregistered/N690ES-2007-06-08), registration cancelled 2007-06-08, S/N 11388, built 1977 (OpenAirDocs) - Reported make and model: Rockwell 690B - Registry model: [Rockwell International 690B](https://openairdocs.org/model/rockwell-international-690b) (registry code 7630516) (OpenAirDocs) - Registry engine: [AiResearch TPE331-5&6SER](https://openairdocs.org/engine/airesearch-tpe331-5-6ser) (registry code 01515, turbo-prop) (OpenAirDocs) - Category: Airplane - Serial number: 11355 - Airframe hours: 6780 - Engines: Garrett TPE-331-5-251 717 horsepower turbo prop - Damage: Substantial damage - Flight: Instructional, Part 91 - Registered owner: William S. Raab - Airworthiness certificate: Standard, Normal - Last inspection: 100 hour, November 1, 1997, 48 hours before - Departed: F29, OKLAHOMA CITY, OK - Destination: BJC - Airport: BJC, Jeffco, runway 11L, 9,000 × 100 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 62; flight instructor, airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane, helicopter; medical: class 2, valid medical--w/ waivers/lim; seat: right; flight hours: 20,000 total, 550 in this make and model, 19,600 as pilot in command ## Weather - Conditions: Visual (VMC), Not reported - Wind: 240° at 12 knots - Visibility: 60 statute miles - Lowest ceiling: 20,000 ft broken - Temperature: 75 °F, dew point 23 °F - Altimeter: 29.00 inHg - Observed at: BJC ## 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 19980424013309A](https://openairdocs.org/incident/19980424013309A), Apr 24, 1998: Gulstm 690B, Denver, CO, Substantial damage. Lost directional control while reversing props on landing roll. Folded left gear. Prop tip made hole in fuselage. (.4)the pilot-owner said that after landing,… 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.