4.1.3 Aerodrome switching under single mode of operation

The single mode of operation also covers potential scenarios where the ATCO/AFISO switches service provision from one aerodrome to another aerodrome, without providing service to both (or more) at the same time. Switching of aerodromes should only be done when circumstances so allow, typically in conjunction with opening/closing of ATS (in accordance with the AIP/NOTAM published ATS hours of operation) for the aerodromes concerned. The ATS provider should establish the procedures and conditions for switching to adequately manage the operational circumstances (e.g. ‘when and how’) for any such implemented scenario. All mechanisms implemented should be validated, approved by the competent authority as part of the change to the functional system and documented in the operations manual (as specified by Regulation (EU) 2017/373 [4], ATM/ANS.OR.B.035 ‘Operations manuals’). Furthermore, related human factors considerations are detailed at the end of Section 6.3.1.