Pt. 36, App. A

(j) Step 10: Designate the largest of the
tone correction factors, determined in Step
9, as C(k). (An example of the tone correction
procedure is given in the current advisory
circular for this part). Tone-corrected perceived noise levels PNLT(k) must be determined by adding the C(k) values to corresponding PNL(k) values, that is:
PNLT(k) = PNL(k) + C(k)

rection factor is suspected to result from
something other than (or in addition to) an
actual tone (or any spectral irregularity
other than airplane noise), an additional
analysis may be made using a filter with a
bandwidth narrower than one-third of an octave. If the narrow band analysis corroborates these suspicions, then a revised value
for the background sound pressure level

For any i-th one-third octave band, at any kth increment of time, for which the tone cor-

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