# Commission Regulation (EU) No 965/2012 of 5 October 2012 laying down technical requirements and administrative procedures related to air operations pursuant to Regulation (EC) No 216/2008 of the European Parliament and of the Council, Division (b): Notwithstanding (a) helicopters with an MOPSC of more than nine and less than 20 are exempted from having a public address system, if:

Extent: E+W+S+N.I.

(1)the helicopter is designed without a bulkhead between pilot and passengers; and
(2)the operator is able to demonstrate that when in flight, the pilot’s voice is audible and intelligible at all passengers’ seats.

---
Source: https://www.legislation.gov.uk/eur/2012/965/annex/IV/division/subpart+d/division/section+2/division/catideh180/division/b (the official version)
Page: https://openlegislation.uk/eu-regulation-2012-965/annex-IV/division-subpart+d/division-section+2/division-catideh180/division-b
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.