Aircraft

Parameters:

Aircr. Group	designation of aircraft group
Nt, Nn	number of counts (a/b resp. Day/Night)
Sigma’	arc length per aircraft class (m)
Rho	perpendicular length from track to receiver (m)
D	chord length (m)
b	corridor width depending on arc length (m)
Z	additional level [dB(A)]
v	speed (m/s)
h	height at transit point U (m)
A	contribution of an aircraft of an aircraft class to the overall level
B	auxiliary value
C	auxiliary value

Parameters:

Aircr. Group	designation of aircraft group
Nt, Nn	number of counts Day/Night
D	chord length (m)
TkNr.	sub corridor-No. (1 .. 15)
Sigma’	arc length per aircraft class (m)
Z	additional level [dB(A)]
v	speed (m/s)
h	height at transit point U (m)
Lmax	maximum level contribution of the segment [dB(A)]
SEL	sound exposure level [dB(A)]
LeqD	energy equivalent sound pressure level day [dB(A)]
LeqN	energy equivalent sound pressure level night [dB(A)]

Parameters:

Aircr. Group	designation of aircraft group
Nt, Nn	number of counts Day/Night
Sigma’	arc length per aircraft class (m)
Rho	perpendicular length from track to receiver (m)
D	chord length (m)
b	corridor width depending on arc length (m)
Z	additional level [dB(A)]
v	speed (m/s)
h	height at transit point U (m)
A	contribution of an aircraft and aircraft class to the overall level
B	auxiliary value
C	auxiliary value

for editions 2006 and 2013: see ECAC Doc.29, 2nd edition

see ECAC Doc.29, 2nd edition

see INM

Parameters:

Aircr. Group	designation of aircraft group
SigmaS	segment length, start (m)
SigmaE	segment length, end (m)
Power	thrust setting, per engine (pounds)
v	speed (m/s)
h	height (m)
Base	base emission level, depending on noise metric selected (dB)
Adur	duration adjustment for exposure-based metrics (dB)
Aseg	segment adjustment (dB)
Aeng	engine-installation effect component (dB)
Alat	lateral attenuation adjustment (dB)
Arev	thrust reverser adjustment
Aimp	acoustic impedance adjustment, correcting for deviation from default atmospheric conditions (dB)
SEL	sound exposure level (dB)

see INM