CEN14CA252

NTSB accident investigation · Aerospatiale AS 365 N2 Dauphin · Constantine, MI · May 25, 2014

Accident · No injuriesData collectionFinal report
Date
May 25, 2014, 10:30 local (14:30 UTC)
Place
Constantine, MI
Injuries
3 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N365WMAerospatiale AS 365 N2 Dauphin
Defining event
Landing-flare/touchdown: Settling with power/vortex ring state
Weather
Visual (VMC) · Day
Status
Completed · report June 18, 2014
Report
Approved by Office Director
NTSB office
Central Region
FAA report
20140525006799A
Case key
89279

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 loss of control while entering a vortex ring state (settling with power) condition, which resulted in a hard landing.

Findings · 2

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Performance/control parameters: descent rateAircraft › Aircraft oper/perf/capability · Not attained/maintainedAerospatiale AS 365 N2 DAUPHIN: 1 caseAll aircraft: 242 casesProbable cause

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

The pilot reported that he positioned the helicopter to land on a westerly heading with the light and variable wind from the west. About 200 feet above the ground he noticed that the helicopter was descending so he increased the collective to arrest the rate of descent. The torque gage was increasing from 50% to 60%. He lowered the collective in attempt to get into clean air and then pulled back on the cyclic to arrest the forward airspeed. The pilot attempted to control the helicopter to the ground, maintain an upright attitude, and avoid obstacles. The helicopter landed hard and bounced once before it came to rest in the parking lot. The pilot reported no preaccident mechanical malfunctions or failures with the helicopter that would have precluded normal operation. A video of the accident sequence was reviewed and matched the pilot's statement. The video did not reveal any anomalies with the helicopter or the engine sounds. A postaccident examination revealed substantial damage to the right fuselage and lower right vertical stabilizer. The video evidence and pilot statement are consistent with the helicopter entering a vortex ring state (settling with power) condition, which allowed the helicopter to descend more rapidly than expected and land hard.

Factual narrative

The pilot reported that he positioned the helicopter to land on a westerly heading with the light and variable wind from the west. About 200 feet above the ground he noticed that the helicopter was descending so he increased the collective to arrest the rate of descent. The torque gage was increasing from 50% to 60%. He lowered the collective in attempt to get into clean air and then pulled back on the cyclic to arrest the forward airspeed. The helicopter continued to descend quickly so the pilot attempted to control the helicopter to the ground, maintain an upright attitude, and avoid obstacles. The helicopter landed hard and bounced once before it came to rest in the parking lot. The pilot reported no preaccident mechanical malfunctions or failures with the helicopter that would have precluded normal operation. A video of the accident sequence was reviewed. The video captured the helicopter as it approached the landing zone, made a right descending turn and then hover taxied over the landing zone. As the helicopter continued to descend, the rate of descent increased. The helicopter continued to the ground where it landed hard and bounced one time. It came to rest upright in the parking lot. The video did not reveal any anomalies with the helicopter or engine sounds. A postaccident examination revealed substantial damage to the right fuselage and lower right vertical stabilizer.

Aircraft

Registration
N365WM
Reported as
Aerospatiale AS 365 N2 Dauphin
Category
Helicopter
Serial number
6429
Built
1991
Airframe hours
6,782
Engines
Turbomeca Arriel 1C2, 738 horsepower, turbo shaftTurbomeca Arriel 1C2, 738 horsepower, turbo shaft
Damage
Substantial damage
Flight
Positioning · Part 91
Operator
West Michigan Air Care Inc
Registered owner
West Michigan Air Care
Airworthiness certificate
Standard, Transport
Last inspection
AAIP · March 6, 2014 · 46 hours before
Departed
9MI9 · Kalamazoo, MI
Destination
Constantine, MI
Flight plan
VFR

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
31
Injuries
None
Certificate
Commercial
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane, Helicopter
Medical
Class 2, Without waivers/limitations
Last flight review
April 10, 2014
Seat
Right
Restraint
5-point
Flight hours
2,268 total · 130 in this make and model · 1,286 as pilot in command · 56 in the last 90 days · 25 in the last 30 days · 1 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
170° at 3 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
73 °F, dew point 55 °F
Altimeter
30.17 inHg
Observed at
KHAI, 8 nm away

Docket · 4

The files NTSB released with the investigation on June 11, 2014, on NTSB’s docket system: statements, records, photos and specialists’ reports. 2.6 MB 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.