796 

14 CFR Ch. I (1–1–19 Edition) 

Pt. 36, App. A 

Section A36.9 Adjustment of Airplane Flight 

Test Results. 

A36.9.1 When certification test conditions 

are not identical to reference conditions, ap-
propriate adjustments must be made to the 
measured noise data using the methods de-
scribed in this section. 

A36.9.1.1 Adjustments to the measured 

noise values must be made using one of the 

methods described in sections A36.9.3 and 
A36.9.4 for differences in the following: 

(a) Attenuation of the noise along its path 

as affected by ‘‘inverse square’’ and atmos-
pheric attenuation 

(b) Duration of the noise as affected by the 

distance and the speed of the airplane rel-
ative to the measuring point 

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