- Aerodromes - Amendments to Part 139 MOS Chapter 11
Chapter 11 of the Part 139 Manual of Standards (MOS) includes standards for siting and clearance areas for airways facilities on airports. Airways facilities at an airport include aeronautical telecommunication and radionavigation facilities for communication, navigation and surveillance (CNS). These airways facilities are used for aircraft guidance and for air traffic control and thus are classified as safety critical services. Some of the facilities, in particular those for precision approach navigation, need to be in positioned in precise geometric relativity to runways. Most of the CNS facilities have an associated site clearance area surrounding the site location to ensure proper operation of the facility.
This standard prevents an aerodrome operator from proceeding with an aerodrome development if it intrudes on the clearance requirements for the particular CNS facility, unless the Civil Aviation Safety Authority (CASA) issues a specific exemption for each proposed development.
On 19 March 2013, CASA published NPC 139/07—Proposed Amendment to Part 139 MOS - Aerodromes - Chapter 11. In NPC 139/07, CASA proposed an amendment to paragraph 11.1.4 of the Part 139 MOS to permit any proposed development to proceed if the aerodrome operator had the written agreement of an approved service provider (the ‘Part 171 service provider’)1 of aeronautical telecommunication and radionavigation services for the aerodrome. The proposal meant that the requirement for CASA to issue an exemption would not have been necessary.
By the time comments closed on 15 May 2013, three (3) responses to the NPC had been received. CASA has taken note of the comments and modified the original proposal. The revised proposal is explained in the body of this NFC and the actual Part 139 MOS amendment schedule is provided at Annex B. The main change is that CASA will, on the basis of advice provided by the Part 171 service provider (currently Airservices Australia), decide whether the proposed aerodrome development can proceed and inform the aerodrome operator accordingly in writing. No formal legal exemption will be necessary.
Contact: Jan Goosen, Project Leader