Just found out myself.
For class 1 (initial issue): Hearing loss no greater than 20 dB in either ear at 500, 1000 and 2000Hz and of no more than 35dB at 3000Hz.
Normal hearing ranges from 0 to 20dB in all
frequencies.
All JAA guidelines are published on:
www.jaa.nl
a good sight on hearing is:
www.earinfo.com