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NTSB Report
December 6, 2023 · Robinson Helicopter R44 II · N422DX
Calexico, CA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
December 6, 2023
Injury Outcomes
No injuries (1 uninjured)
Location
Calexico, CA
Aircraft
Robinson Helicopter R44 II (2009)
Tail Number
N422DX
Operator
Merten Aviation Services
Injuries
None
Aircraft Damage
Substantial
NTSB Number
WPR24LA092
The pilot was on an aerial application flight and was maneuvering the helicopter at a low altitude. During a decent to a field, the main rotor blade struck a powerline wire. The pilot felt an unusual vibration and performed a precautionary landing. A postflight examination revealed that a main rotor blade sustained substantial damage. No preaccident mechanical failures or malfunctions with the helicopter that would have precluded normal operation were reported.
NTSB Probable Cause
The pilot's failure to maintain clearance from power lines during an aerial application flight.
Full Narrative
The pilot was on an aerial application flight and was maneuvering the helicopter at a low altitude. During a decent to a field, the main rotor blade struck a powerline wire. The pilot felt an unusual vibration and performed a precautionary landing. A postflight examination revealed that a main rotor blade sustained substantial damage. No preaccident mechanical failures or malfunctions with the helicopter that would have precluded normal operation were reported.
Flight
Event TypeAccident
Event Time17:30 PST
Nearest Airport0nm
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftRobinson Helicopter R44 II
Tail NumberN422DX
Aircraft CategoryHeli
DamageSubstantial
OperatorMerten Aviation Services
Operating RulePart 137
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · IO-540-AE1A5 · Reciprocating
Seats4
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 49 · First Class · None
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility10 sm
CeilingNone
Temperature / Dew Point36 F
Altimeter30.08 inHg
Observation Time16:53
Weather SourceWFAC