ATTB

NORTHROP GRUMMAN

Exterior Noise Test

Accelerating from Standstill

Date : 1998-10-29
Personnel : B.L. and B.B.
Temperature (°F) : 50 Humidity (%) : 52
Wind Speed (mph) : 6 Wind Direction : w
Barometric Pressure (in.Hg) : 30.06
Verify that microphone height is 4 feet, wind speed is less than 12 mpg and ambient temperature is between 30 F and 90 F: true checked by R.L.L.
Initial Sound Level Meter Calibration: true checked by R.L.L.
Exterior Ambient Noise Level dB(A): 41.4

Accelerating from Constant Speed
Curb (Right) Side
Accelerating from Constant Speed
Street (Left) Side
Run # Measured Noise Level dB(A) Run # Measured Noise Level dB(A)
1 77.2 1 82.3
2 76.9 2 82.3
3 77.8 3 81.3
4 76.4 4 82.5
5 77.3 5 82.2
Average of two highest actual noise levels = 77.6 dB(A) Average of two highest actual noise levels = 82.4 dB(A)