363 

Federal Aviation Administration, DOT 

Pt. 60, App. C 

±

5 dB on three (3) consecu-

tive bands when compared 
to initial evaluation; and 

±

2 

dB when comparing the av-
erage of the absolute dif-
ferences between initial 
and continuing qualification 
evaluation. 

Applicable only to Continuing 

Qualification Evaluations. If 
frequency response plots 
are provided for each 
channel at the initial eval-
uation, these plots may be 
repeated at the continuing 
qualification evaluation with 
the following tolerances ap-
plied: 

(a) The continuing qualifica-

tion 

1

⁄

3

octave band ampli-

tudes must not exceed 

±

5 

dB for three consecutive 
bands when compared to 
initial results. 

(b) The average of the sum 

of the absolute differences 
between initial and con-
tinuing qualification results 
must not exceed 2 dB 
(refer to table C2C in Ap-
pendix C). 

X  Measurements are compared 

to those taken during initial 
qualification evaluation. 

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