14 CFR Ch. I (1-1-19 Edition)

(3) Figure H1 illustrates the significant geometrical relationships influencing sound
propagation. Position L represents the helicopter location on the measured takeoff path

from which PNLTM is observed at station A,
and Lr is the corresponding position on the
reference sound propagation path. Propagation paths AL and ALr both form the same

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spaschal on DSK3GDR082PROD with CFR

Pt. 36, App. H