TowerSentry® is America's oldest independent tower monitoring NOC, serving clients 24-7 nationwide. TowerSentry® clients receive immediate fax, email or telephone notification of all strobe or beacon failures. At the same time required NOTAMs are filed with local Flight Service Stations. TowerSentry® tracks repair progress and files NOTAM extensions as needed until tower lights are working properly again. You can view your accounts directly on the EnterNOC web server and download a complete log each month recording all tower light activity for your files.