824 

14 CFR Ch. I (1–1–19 Edition) 

Pt. 36, App. H 

(3) Figure H1 illustrates the significant ge-

ometrical relationships influencing sound 
propagation. Position L represents the heli-
copter location on the measured takeoff path 

from which PNLTM is observed at station A, 
and L

r

is the corresponding position on the 

reference sound propagation path. Propaga-
tion paths AL and AL

r

both form the same 

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