CHI08CA018

NTSB accident investigation · Bell 407 · St Cloud, MN · October 15, 2007

Accident · No injuriesData collectionFinal report
Date
October 15, 2007, 18:30 local (23:30 UTC)
Place
St Cloud, MN
Injuries
3 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N407LLBell 407
Weather
Visual (VMC) · Day
Status
Completed · report December 20, 2007
Report
Approved by Office Director
Parties
FAA-Minneapolis FSDO
FAA report
20071015824599A
Case key
67035

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 execute a go-around when a normal approach to the intended landing point could not be maintained. An additional cause was the excessive descent rate that developed during the approach. Contributing factors were the tailwind condition and the tree line.

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.

Hard landingLanding
Go-around - not performedPilot in commandCause
Proper descent rate - not maintainedPilot in commandCause
Weather condition - tailwindFactor
Object - tree(s)Factor

Analysis

The pilot reported that he experienced a stuck microphone after takeoff and elected to return to the helipad for landing. He noted that reversing course for landing resulted in a right quartering tailwind on approach. The pilot reported that about 100 feet above ground level (agl), he noticed that the helicopter was not slowing down. His attempt to reduce the ground speed by "slipping" the aircraft was not successful. As the helicopter approached a line of trees, he turned toward an open area; however, the helicopter began to settle in the turn. He applied power in an attempt to reduce the descent rate and pitched up in order to position the helicopter for a hard landing. Although the descent rate began to decrease about 30 feet agl, the helicopter skids impacted the crest of a hill. The pilot added power and brought the helicopter to a hover, before landing near the heliport.

Factual narrative

The helicopter was substantially damaged during a hard landing. The pilot reported that he experienced a stuck microphone after takeoff and elected to return to the helipad for landing. He noted that reversing course for landing resulted in a right quartering tailwind on approach. The pilot reported that about 100 feet above ground level (agl), he noticed that the helicopter was not slowing down. His attempt to reduce the ground speed by "slipping" the aircraft was not successful. As the helicopter approached a line of trees, he turned toward an open area; however, the helicopter began to settle in the turn. He applied power in an attempt to reduce the descent rate and pitched up in order to position the helicopter for a hard landing. Although the descent rate began to decrease about 30 feet agl, the helicopter skids impacted the crest of a hill. The pilot added power and brought the helicopter to a hover, before landing near the heliport. The post accident examination revealed that the skids, lower fuselage and left stabilizer were damaged in the hard landing.

Aircraft

Registration
N407LL
Reported as
Bell 407
Category
Helicopter
Serial number
53561
Airframe hours
2,333
Engine
Rolls-Royce 250-C47B, 674 horsepower, turbo shaft
Damage
Substantial damage
Flight
Part 135
Operator
Air Methods, Inc.
Registered owner
FCC Equipment Financing Inc.
Airworthiness certificate
Standard, Normal
Last inspection
AAIP · October 1, 2007
Departed
STC · St Cloud, MN
Destination
PVT · Buffalo, MN
Airport
STC · St Cloud Muni

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
36
Injuries
None
Certificate
Commercial
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Helicopter
Medical
Class 1, Without waivers/limitations
Last flight review
October 1, 2007
Seat
Right
Flight hours
2,562 total · 202 in this make and model · 1,491 as pilot in command · 60 in the last 90 days · 17 in the last 30 days · 0 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
60° at 8 knots, gusting 18
Visibility
10 statute miles
Lowest ceiling
2,300 ft overcast
Temperature
48 °F, dew point 36 °F
Altimeter
29.94 inHg
Observed at
STC

Docket · 1

The files NTSB released with the investigation on November 8, 2007, on NTSB’s docket system: statements, records, photos and specialists’ reports. 693 KB in all.

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.