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Any failure or malfunction that lasts more than thirty (30) minutes and affects a top light or flashing obstruction <br /> light,regardless of its position, should be reported immediately to (877)487-6867 so a Notice to Airmen <br /> (NOTAM)can be issued. As soon as the normal operation is restored, notify the same number. <br /> If we can be of further assistance,please contact our office at(202) 267-8783. On any future correspondence <br /> concerning this matter,please refer to Aeronautical Study Number 2012-AGL-10311-OE. <br /> Signature Control No: 175773204-178898616 ( DEV) <br /> Sheri Edgett-Baron <br /> Manager, Obstruction Evaluation Group <br /> cc: FCC <br /> Page 2 of 2 <br />