249 

Federal Aviation Administration, DOT 

Pt. 60, App. C 

7. S

OUND

S

YSTEM

 

a. General. The total sound environment in 

the helicopter is very complex, and changes 
with atmospheric conditions, helicopter con-

figuration, airspeed, altitude, and power set-
tings. Flight deck sounds are an important 
component of the flight deck operational en-
vironment and provide valuable information 

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