1 fatal · Bell UH-1H · 1998-12-23 · QUINCY, CA, USA
Event
NTSB number
LAX99FA057
Event ID
20001211X11576
Type
Accident
Date
1998-12-23
Location
QUINCY, CA, USA
Coordinates
39.960762, -121.000068
Injuries
Highest injury
FATL
Fatal
1
Serious
0
Minor
0
Uninjured
0
Total aboard
1
Aircraft
Make
Bell
Model
UH-1H
Registration
N4590
FAR Part
133
Engines
1
Damage
DEST
Conditions
Light
DAYL
Weather
VMC
Probable cause
An inaccurate exhaust gas temperature gauge, that allowed the engine to be run over-temperature unknowingly by the pilot, which resulted in the subsequent failure of the turbine sections. Also causal was the pilot's failure to maintain rotor RPM during the autorotation. A factor in the accident was the operator's failure to adequately perform engine health indicator tests.