MINR · ROBINSON HELICOPTER COMPANY R44 II · 2017-08-26 · El Dorado Hills, CA, USA
Event
NTSB number
WPR17LA188
Event ID
20170826X21023
Type
Accident
Date
2017-08-26
Location
El Dorado Hills, CA, USA
Coordinates
38.723888, -121.070274
Injuries
Highest injury
MINR
Fatal
0
Serious
0
Minor
2
Uninjured
0
Total aboard
2
Aircraft
Make
ROBINSON HELICOPTER COMPANY
Model
R44 II
Registration
N61NM
FAR Part
091
Engines
1
Damage
SUBS
Conditions
Light
DUSK
Weather
VMC
Probable cause
Maintenance personnel's inadequate routine maintenance on the helicopter engine, which led to low cylinder compression, improper magneto timing, and camshaft lobe wear, which subsequently resulted in degraded engine performance.