827 

Federal Aviation Administration, DOT 

Pt. 36, App. H 

within 10 dB of PNLTM, as required. The fly-
over profile is defined by the height AG 
which is a function of the operating condi-
tions controlled by the pilot. Position M rep-
resents the helicopter location on the meas-
ured flyover flight path for which PNLTM is 
observed at station A, and M

r

is the cor-

responding position on the reference flight 
path. 

(d) 

Approach profiles. 

(1) Figure H3 illus-

trates a typical approach profile, including 
reference conditions. 

(2) The helicopter approaches position H 

along a 6

° 

(

±

0.5

°

) average approach slope 

throughout the 10dB-down time interval. De-
viation from the 6

° 

average approach slope 

must be approved by the FAA before testing. 

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