391. Civil propeller-driven aeroplanes and subsonic jet aeroplanes.

(iii)ÌýÌýÌýÌý Noise Certification

a.ÌýÌýÌýÌý Requirement for Noise Certificates

391.ÌýÌýÌýÌý Civil propeller-driven aeroplanes and subsonic jet aeroplanes.

No civil propeller-driven aeroplane1 and, in general, no civil subsonic jet aeroplane2, registered