243 

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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