981 

Federal Aviation Administration, DOT 

Pt. 36, App. J 

Section K4 Noise Limits 

For a tiltrotor, the maximum noise levels, 

as determined in accordance with the noise 
evaluation in EPNdB and calculation method 
described in section H36.201 of Appendix H of 
this part, must not exceed the noise limits as 
follows: 

(a) 

At the takeoff flight path reference point: 

For a tiltrotor having a maximum certifi-
cated takeoff weight (mass) of 176,370 pounds 
(80,000 kg) or more, in VTOL/Conversion 
mode, 109 EPNdB, decreasing linearly with 
the logarithm of the tiltrotor weight (mass) 
at a rate of 3.0 EPNdB per halving of weight 
(mass) down to 89 EPNdB, after which the 
limit is constant. Figure K4 illustrates the 
takeoff noise limit as a solid line. 

(b) 

At the Flyover path reference point: For a 

tiltrotor having a maximum certificated 

takeoff weight (mass) of 176,370 pounds 
(80,000 kg) or more, in VTOL/Conversion 
mode, 108 EPNdB, decreasing linearly with 
the logarithm of the tiltrotor weight (mass) 
at a rate of 3.0 EPNdB per halving of weight 
(mass) down to 88 EPNdB, after which the 
limit is constant. Figure K4 illustrates the 
flyover noise limit as a dashed line. 

(c) 

At the approach flight path reference 

point: For a tiltrotor having a maximum cer-
tificated takeoff weight (mass) of 176,370 
pounds (80,000 kg) or more, in VTOL/Conver-
sion mode, 110 EPNdB, decreasing linearly 
with the logarithm of the tiltrotors weight 
(mass) at a rate of 3.0 EPNdB per halving of 
weight (mass) down to 90 EPNdB, after which 
the limit is constant. Figure K4 illustrates 
the approach noise limit as a dash-dot line. 

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