DEN05LA068

NTSB accident investigation · Enstrom F-28C · Morrison, CO · April 13, 2005

Accident · No injuriesLimited investigationFinal report
Date
April 13, 2005, 17:00 local (23:00 UTC)
Place
Morrison, CO
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N5690KEnstrom F-28C
Weather
Visual (VMC) · Day
Status
Completed · report October 27, 2005
Report
Approved by Office Director
Parties
Federal Aviation Administration
FAA report
20050413006649A
Case key
61334

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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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

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

In flight collision with terrain/waterLanding - flare/touchdown
Rotor rpm - not maintainedPilot in commandCause
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
Reported as
Enstrom F-28C
Category
Helicopter
Serial number
477
Airframe hours
2,114
Engine
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

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
35
Injuries
None
Certificate
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.