6.5.2.Migration from a conventional tower to a remote contingency tower

6.5.2. Migration from a conventional tower to a remote contingency tower When the remote aerodrome ATS have been implemented for contingency purposes as a backup for the conventional tower services, all operational site requirements evaluated for the specific remote contingency tower shall be met; in addition, Sections 4.1.4, 6.3.1 and 6.5 should be taken into account. The local contingency plan determines the circumstances when the degradation of aerodrome services interrupts the operation of the conventional tower and when services have to be migrated to the remote contingency tower. Migration from a conventional tower to a remote contingency tower may happen for different reasons. The contingency plan should define procedures for the below-listed situations: Unplanned remote contingency operation in case of unexpected events or problems e.g. equipment failure, fire, security threat, etc. Planned remote contingency operation e.g. software or hardware changes of ATM system elements, competence maintenance training, on-the-job training Reverting the provision of ATS back from the remote contingency facility to the conventional tower Due to its nature, the remote contingency tower is not in constant operation. In order to be able to maintain its capability of providing ATS backup for a conventional tower whenever it is required: in addition to Section 7.2.3, on appropriate technical maintenance, procedures should be developed and implemented to ensure continuous availability. The ATS provider should ensure that all hardware and software modifications made to the conventional tower system, whenever is applicable, are also made to the remote contingency tower system components as well; in addition to Section 6.4, security measures should be established to eliminate the risk of impact on the operation due to unauthorised human action; and based on the local competence scheme, regular trainings should be provided to maintain the competence of operational personnel.