![img](MIL-PRF-1900400010im.jpg)
MIL-PRF-19004B
Total sound power levels in decibels (dB) referenced to 10-
12
watt.
TABLE
IV.
Octave band center frequency - Hz
Fan size
63
125
250
500
1000
2000
4000
8000
54
62
69
73
74
88
85
87
1/4
56
63
71
72
75
85
87
86
1/2
62
65
70
75
76
80
87
89
1
64
67
72
77
78
82
89
91
1-1/2
69
78
80
81
83
85
91
92
2
72
75
84
88
91
92
92
94
3
72
76
85
89
91
92
92
96
4
73
77
86
90
92
93
93
97
5
65
70
76
79
84
88
89
91
6
78
83
86
87
90
91
96
95
8
80
85
88
89
92
93
98
97
10
NOTE--An additional +3dB tolerance is allowed in each active band.
4.
VERIFICATION
4.1 Classifications of inspections.
The inspections specified herein are
classified as follows:
a.
First article inspection (see 4.2).
b.
Conformance inspection (see 4.3).
c.
Periodic conformance inspection (see 4.4).
4.2 First article inspection. First article inspection shall consist of the
examinations of 4.6 and tests as specified in Table V. The tests specified
shall be performed on each size fan-motor unit.
4.3 Conformance inspection. Conformance inspection shall consist of the
examinations of 4.7 and tests as specified in Table V. The tests specified
shall be performed on each size fan-motor unit. Any unit that fails to meet
any specified requirements shall be rejected.
4.4 Periodic conformance inspection. Periodic tests are required to ensure
continuing satisfactory operation of identical units. The tests are required
under any contract or purchase order for fans of existing design when the
invitation to bid is dated 4 years or more subsequent to the date of the last
previous test of an identical unit. Periodic tests shall consist of the tests
specified in Table V.
4.5 Composite material. A representative fan constructed of composite
material shall meet requirements of 4.8.
10
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