Touchdown sound problem with the default DC-3

Hello guysI have a problem with the default DC-3There is no way that I can generate the touchdown sound included in the sound.cfg no matter how hard I land (I often crashed the plane and at that point it generates the crash noise!!!).The only noise I ear is the rumble of the ground roll.I never modified the plane, is defauls as delivered from Microsoft (plane and sound) and files are in the right place, everything is in order.Is it maybe a bug in the plane itself?? Can I correct it??? Maybe i can learn how to do it in case i find other aicraft with the same problem.Thank you for your answer!!!Regards