ERA22LA231

NTSB accident investigation · Eurocopter AS355 · Palm Beach, FL · May 19, 2022

Accident · No injuriesClass 4 · LimitedFinal report
Date
May 19, 2022, 12:10 local (16:10 UTC)
Place
Palm Beach, FL
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
N448JMEurocopter AS355
Defining event
Enroute: Part(s) separation from AC
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
Investigation class
Class 4 - Basic report with no Prelim publish
NTSB office
Eastern Region Aviation
Parties
FAA
FAA report
20220519007479A
Case key
105102

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

On this page

Probable cause

The pilot’s inadequate preflight inspection, which resulted in the unlatched engine cowling opening and being struck by a main rotor blade during flight. Contributing to the accident was the mechanic’s failure to properly secure the cowling following maintenance.

Findings · 5

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.

Inspection: preflight inspectionPersonnel issues › Task performance · PilotEurocopter AS 355N: 1 caseAll aircraft: 551 casesProbable cause
Doors: service doorsAircraft › Aircraft structures · Inadequate inspectionEurocopter AS 355N: 1 caseAll aircraft: 5 casesProbable cause
MaintenancePersonnel issues › Task performance · Maintenance personnelEurocopter AS 355N: 1 caseAll aircraft: 143 casesProbable cause
Inspection: post maintenance inspectionPersonnel issues › Task performance · Maintenance personnelEurocopter AS 355N: 1 caseAll aircraft: 57 casesProbable cause
Inspection: post maintenance inspectionPersonnel issues › Task performance · PilotEurocopter AS 355N: 1 caseAll aircraft: 57 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 picked up the helicopter from a repair facility and while flying home heard a “boom,” felt a vibration in the tail, and performed a precautionary landing to a beach. Postaccident examination of the helicopter revealed that the engine cowling had become unlatched and was subsequently struck by a main rotor blade. The detached cowling then struck the horizontal stabilizer and tail rotor, which resulted in substantial damage. The pilot reported that he did not confirm that the engine cowling latch was properly secured during his preflight inspection. He reported that there were no mechanical malfunctions or failures of the helicopter before the cowling opened and detached.

Aircraft

Registration
N448JM
Reported as
Eurocopter AS355 (N)
Category
Helicopter
Serial number
5627
Built
1997
Airframe hours
3,547.2
Engine
Eurocopter Turbomeca Arrius 1A, 479 horsepower, turbo shaft
Damage
Substantial damage
Flight
Personal · Part 91
Airworthiness certificate
Standard, Normal
Last inspection
Unknown · May 19, 2022
Departed
PBI · West Palm Beach, FL
Destination
HWO · North Perry, FL

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
48
Injuries
None
Certificate
Private
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 2, Without waivers/limitations
Last flight review
February 1, 2022
Seat
Right
Restraint
4-point
Flight hours
2,707 total · 212 in this make and model · 2,292 as pilot in command · 90 in the last 90 days · 42 in the last 30 days · 2 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
120° at 6 knots
Visibility
10 statute miles
Temperature
90 °F, dew point 73 °F
Altimeter
30.03 inHg
Observed at
BCT, 5 nm away
METAR
KBCT 191553Z 12006KT 10SM SCT050 32/23 A3003

Docket · 3

The files NTSB released with the investigation on June 3, 2022, on NTSB’s docket system: statements, records, photos and specialists’ reports. 5.8 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.