曝光台 注意防骗
网曝天猫店富美金盛家居专营店坑蒙拐骗欺诈消费者
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8.9
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0.1
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APP 1-25 2411 1/05
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15
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::: :::
11.3 9.4
Annex 16 - Environmental Protection Volume I
Table A1-16. Sound attenuation coefficient in dB1100 m
Band centre
frequency I Relative humidity = 100%
Temperature, OC
8.3 The equations given in 8.2 are convenient for b) test flight path at altitude different from reference;
calculation by means of a computer. For use in other cases, and
numerical values determined from the equations are given in
Tables A1-7 to A1-16. c) test mass different from maximum.
Note 2.- Negative correction can arise if the atmospheric
9. DETAILED CORRECTION PROCEDURES
9.1 Introduction
9.1.1 When the noise certification test conditions are not
identical to the noise certification reference conditions, appropriate
corrections shall be made to the EPNL calculated from
the measured data by the methods of this section.
Note I.- Dtfferences between reference and test conditions
which lead to corrections can result >om the following:
a) atmospheric absorption of sound under test conditions
dzfferent +om reference;
-
absorption of sound under test conditions is less than reference
and also the test flight path is at a lower altitude than
reference.
The take-off test flight path can occur at a higher altitude
than reference if the meteomlogical conditions permit superior
aeroplane performance ("cold day" effect). Conversely, the
"hot day " effect can cause the take-off testflight path to occur
at a lower altitude than reference. The approach test flight path
can occur at either higher or lower altitudes than reference
irrespective of the meteorological conditions.
9.1.2 The measured noise values shall be properly
corrected to the reference conditions, either by the correction
procedures presented as follows or by an integrated programme
which shall be approved as being equivalent.
24/11/05 APP 1-26
Appendir I Annex 16 - Environmental Protection
9.1.2.1 Correction procedures shall consist of one or more
values added algebraically to the EPNL calculated as if the
tests were conducted completely under the noise certification
reference conditions.
9.1.2.2 The flight profiles shall be determined for both
take-off and approach, and for both reference and test conditions.
The test procedures shall require noise and flight path
recordings with a synchronized time signal from which the test
profile can be delineated, including the aeroplane position for
which PNLTM is observed at the noise measuring station. For
take-off, a flight profile corrected to reference con&tions shall
be derived fiom data approved by the certificating authority.
Note.- For approach, the reference profile is defined hy
the reference conditions in 5.3.
9.1.2.3 The differing noise path lengths tkom the aeroplane
to the noise measuring station corresponding to PNLTM shall
be determined for the test and reference conditions. The SPL
values in the spectrum of PNLTM shall then be corrected for
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