cedures given in the N&V manual. The simplest
PWL data are given. The l-dB differences that oc-
form is repeated here.
cur in some Item 7 values, between figures 4-7 and
48, are caused by interpolating or rounding off to
the nearest integer. Either set of values could be
considered valid.
(d) The two other engines to the left side of
the Engine Room also contribute SPLs to the
Maintenance Shop wall and the Control Room wall.
Additional copies of DD Form 2296 should be filled
(e) The total SPLs at the Engine Room side
in for each sound source; the Item 4 distances are
of the Maintenance Shop and Control Room walls
28 ft. and 30 ft., respectively, for the second engine
are then summarized on DD Form 2297. Figure 49
and 48 ft. and 49 ft., respectively, for the third(fu-
is a filled-in copy for the common wall with the
ture) engine. Octave band levels, in decibels, are
Maintenance Shop.
added in accordance with the decibel addition pro-
4-13
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