# NTSB DEN05LA068: Enstrom F-28C, N5690K, Morrison, CO, April 13, 2005 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: April 13, 2005, 17:00 local (23:00 UTC) - Place: Morrison, CO - Coordinates: 39.668888, -105.219718 - Nearby events: https://openairdocs.org/map.md?lat=39.6689&lon=-105.2197&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report October 27, 2005 - Report: Approved by Office Director - Parties: Federal Aviation Administration - NTSB case key (mKey): 61334 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN05LA068 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/61334/pdf - Page: https://openairdocs.org/ntsb/DEN05LA068 ## Probable cause the pilot's failure to maintain rotor RPM during the approach which resulted in a landing short of the helipad. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - In flight collision with terrain/water, landing - flare/touchdown - rotor rpm - not maintained, pilot in command (cause) - terrain condition - short runway/landing area ## Analysis After performing two approaches and landings to a helipad, the pilot and pilot-rated passenger elected to fly to another helipad. The pilot-rated passenger, who was also a rotorcraft flight instructor, performed an approach to a hover above the helipad without incident. After the helicopter departed the helipad, the pilot then attempted an approach to the helipad. During a steep approach to a helipad, the helicopter descended below the helipad, which was an elevated concrete surface. The pilot increased collective, the rotor RPM began to droop, and the helicopter landed short of the helipad. During the landing, the helicopter impacted the side of the helipad and sustained substantial damage. Examination of the helicopter revealed the firewall and lower fuselage were crushed and the left skid was collapsed. ## Factual narrative On April 13, 2005, approximately 1700 mountain daylight time, an Enstrom F-28C helicopter, N5690K, registered to Honeybear Helicopter's LLC, Golden, Colorado, sustained substantial damage during an attempted landing at a private landing pad near Morrison, Colorado. Visual meteorological conditions prevailed at the time of the accident. The personal flight was being conducted under the provisions of Title 14 CFR Part 91 without a flight plan. The pilot and pilot-rated passenger reported no injuries. The flight originated at Jeffco Airport (BJC), Broomfield, Colorado, approximately 1530. According to the pilot and pilot-rated passenger, they departed BJC en route to two restaurant helipads which were located in high elevation areas. The pilot performed a high reconnaissance of one restaurant helipad, and two approaches and landings were made to the other restaurant helipad without incident. The pilot and pilot-rated passenger then elected to fly to a third helipad. The pilot-rated passenger performed a high reconnaissance of the area and executed an approach to the helipad, which was an elevated concrete landing surface. After the approach, the pilot-rated passenger brought the helicopter to a hover above the helipad, and then departed the helipad. The pilot then took over control of the helicopter, and set up for another approach to the helipad. During a steep approach "with a good sight picture of the pad", the helicopter descended below the helipad. The pilot increased collective; however, the rotor RPM began to "droop." Subsequently, the helicopter landed short and impacted the side of the helipad. The helicopter's right lower forward fuselage section struck the edge of the helipad. The helicopter slid off the pad, and came to rest west of the pad. Examination of the helicopter revealed the firewall and lower forward fuselage section were crushed and its left landing gear skid assembly was collapsed. The pilot had accumulated approximately 114 total rotorcraft flight hours, and 6 hours in the make and model accident helicopter. The pilot-rated passenger had accumulated approximately 1,209 total rotorcraft flight hours, 948 total hours as a rotorcraft flight instructor, and 40 hours in the make and model accident helicopter. ## Aircraft - Registration: [N5690K](https://openairdocs.org/aircraft/N5690K), registered now, S/N 477 (OpenAirDocs) - Reported make and model: Enstrom F-28C - Registry model: [Enstrom F-28C](https://openairdocs.org/model/enstrom-f-28c) (registry code 3300407) (OpenAirDocs) - Registry engine: [Lycoming HIO-360 series](https://openairdocs.org/engine/lycoming-hio-360-series) (registry code 41524, reciprocating) (OpenAirDocs) - Category: Helicopter - Serial number: 477 - Airframe hours: 2114 - Engines: Lycoming HIO-360-E1AD 205 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Honeybear Helicopters LLC - Airworthiness certificate: Standard, Normal - Last inspection: Annual, September 1, 2004, 36 hours before - Departed: BJC, Broomfield, CO - Destination: PVT, Morrison, CO ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 35; injuries: none; private; medical: class 2, with waivers/limitations; last flight review February 1, 2005; seat: left; flight hours: 116 total, 6 in this make and model, 45 as pilot in command, 40 in the last 90 days, 10 in the last 30 days, 1 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 90° at 5 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 50 °F - Altimeter: 30.12 inHg ## 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 20050413006649A](https://openairdocs.org/incident/20050413006649A), Apr 13, 2005: Enstrm F28C, Morrison, CO, Substantial damage. (-23) On April 13, 2005, at 17:00 MDT, N5690K, an Enstrom F-28C helicopter hit the landing pad at mount Morrison on landing. The PIC had a total of 113 hours… 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.