# The Air Navigation (Isle of Man) Order 2015, Article 99L: Use of boom microphones


Flight crew members required to be on flight deck duty on a flight in an aircraft must communicate through boom microphones when the aircraft is below the transition level or transition altitude.

---
Source: https://www.legislation.gov.uk/uksi/2015/870/article/99L (the official version)
Page: https://openlegislation.uk/air-navigation-isle-of-man-order-2015/article-99L
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.