NONE · MDHI 520N · 2001-07-25 · Los Angeles, CA, USA
Event
NTSB number
LAX01IA262
Event ID
20010803X01604
Type
Incident
Date
2001-07-25
Location
Los Angeles, CA, USA
Coordinates
33.95, -118.411109
Injuries
Highest injury
NONE
Fatal
0
Serious
0
Minor
0
Uninjured
2
Total aboard
2
Aircraft
Make
MDHI
Model
520N
Registration
N953SD
FAR Part
091
Engines
1
Damage
MINR
Conditions
Light
NITE
Weather
VMC
Probable cause
the excitation of the first bending mode natural frequency of the aft tube assembly that is installed through the rotating NOTAR fan drive system. Contributing factors to the incident included the operator's maintenance practice of hand-sanding the pitch slider component of the NOTAR fan system.