Place the (jetroll) (jetwind) (jetroll) sounds into the aircraft's sound sub-dir.
Install: go to your aircraft's sound cfg and edit the following lines:

***************************************************************************
[WIND_SOUND]
filename=jetwind
minimum_volume=6500
maximum_volume=12000
minimum_rate=.60
maximum_rate=.90
minimum_speed=175
maximum_speed=400

[GROUND_ROLL]
filename=jetroll
flags=125218
minimum_volume=7500
maximum_volume=10000<----------Louder=12000
minimum_speed=3
maximum_speed=150
minimum_rate=0.80
maximum_rate=2.1
link=GROUND_ROLL1

[GROUND_ROLL1]
filename=jetroll
flags=135380

[GEAR_DOWN]
filename=jetgrdn
minimum_volume=10000<------------Louder=12000

[GEAR_UP]
filename=jetgrup
minimum_volume=10000<------------Louder=12000
***************************************************************************
Hit save and exit!
Aaron****
Skysong Soundworks
ARSpilot@netscape.net