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*e0icopter 2oie +ea3reent Reg30ation Aircraft position, performance data and noise measurements must be corrected to the following noise

certification reference atmospheric conditions

(1) Sea level pressure of 2,116 psf (1,0132! h"a)

(2) Ambient temperature of ## degrees $ (2! degrees %)

(3) &elative humidit' of #0 percent

() ero wind

Flat reference test site without line of sight obstructions across the ight path thatencompasses 10dB down points

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1) Stage 1 noise limits for acoustical changes for helicopters are as follows*

(i) $or ta+eoff, fl'over, and approach calculated noise levels, the noise levels of each Stage 1

helicopter that eceed the Stage 2 noise limits plus 2 -".d/ ma' not, after a change in t'pe design,

eceed the noise levels created prior to the change in t'pe design

(ii) $or ta+eoff, fl'over, and approach calculated noise levels, the noise levels of each Stage 1helicopter that do not eceed the Stage 2 noise limits plus 2 -".d/ ma' not, after the change in t'pe

design, eceed the Stage 2 noise limits plus 2 -".d/

(2) Stage 2  noise limits are as follows*

(i) For takeoff calculated noise levels10 -".d/ for maimum ta+eoff weights of 1#6,3#0 pounds

(0,000 +g) or more, reduced b' 301 -".d/ per halving of the weight down to -".d/, after which

the limit is constant

(ii) For flyover calculated noise levels10 -".d/ for maimum weights of 1#6,3#0 pounds

(0,000 +g) or more, reduced b' 301 -".d/ per halving of the weight down to -".d/, after which

the limit is constant

(iii) For approach calculated noise levels110 -".d/ for maimum weights of 1#6,3#0 pounds

(0,000 +g) or more, reduced b' 301 -".d/ per halving of the weight down to 0 -".d/, after which

the limit is constant

(3) Stage 3 noise limits are as follows*

(i) $or ta+eoff$or a helicopter having a maimum certificated ta+eoff weight of 1#6,3#0 pounds

(0,000 +g) or more, the noise limit is 106 -".d/, which decreases linearl' with the logarithm of the

helicopter weight (mass) at a rate of 30 -".d/ per halving of the weight (mass) down to 6 -".d/,

after which the limit is constant

(ii) $or fl'over$or a helicopter having a maimum certificated ta+eoff weight of 1#6,3#0 pounds

(0,000 +g) or more, the noise limit is 10 -".d/, which decreases linearl' with the logarithm of the

helicopter weight (mass) at a rate of 30 -".d/ per halving of the weight (mass) down to -".d/,

after which the limit is constant

(iii) $or approach$or a helicopter having a maimum certificated ta+eoff weight of 1#6,3#0 pounds

(0,000 +g) or more, the noise limit is 10 -".d/, which decreases linearl' with the logarithm of the

helicopter weight (mass) at a rate of 30 -".d/ per halving of the weight (mass) down to -".d/,

after which the limit is constant

(b) Tradeoffs. -cept to the etent limited under 3611(b) of this part, the noise limits prescribed in

paragraph (a) of this section ma' be eceeded b' one or two of the ta+eoff, fl'over, or approachcalculated noise levels determined under section 436203 of this appendi if 

(1) 5he sum of the eceedances is not greater than -".d/

(2) .o eceedance is greater than 3 -".d/ and

(3) 5he eceedances are completel' offset b' reduction in the other re7uired calculated noise levels

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