Several ways of handling it. Of course want to get a second aircraft report first before you do anything. Primary thing is once it's confirmed out, you want to get the "owners" of that piece of NAVAID equipment working on it in a hurry. I can't remember NAS time requirements for sending the NOTAM because we went by the NAVAIR 114-80T & 3721.30. Basic guidance from the .65:
2−1−9. REPORTING ESSENTIAL FLIGHT INFORMATION Report as soon as possible to the appropriate FSS, airport manager’s office, ARTCC, approach control facility, operations office, or military operations office any information concerning components of the NAS or any flight conditions which may have an adverse effect on air safety. NOTE− FSSs are responsible for classifying and disseminating Notices to Airmen. REFERENCE− FAAO JO 7110.65, Para 3−3−3, Timely Information. FAAO JO 7110.65, Para 5−1−6, Service Limitations. FAAO JO 7210.3, Para 3−1−2, Periodic Maintenance. USN, See OPNAVINST 3721.30.
2−1−10. NAVAID MALFUNCTIONS a. When an aircraft reports a ground−based NAVAID malfunction, take the following actions: 1. Request a report from a second aircraft. 2. If the second aircraft reports normal operations, continue use and inform the first aircraft. Record the incident on FAA Form 7230−4 or appropriate military form. 3. If the second aircraft confirms the malfunc- tion or in the absence of a second aircraft report, activate the standby equipment or request the monitor facility to activate. 4. If normal operation is reported after the standby equipment is activated, continue use, record the incident on FAA Form 7230−4 or appropriate military form, and notify technical operations personnel (the Systems Engineer of the ARTCC when an en route aid is involved). 5. If continued malfunction is reported after the standby equipment is activated or the standby equipment cannot be activated, inform technical operations personnel and request advice on whether or not the aid should be shut down. In the absence of a second aircraft report, advise the technical operations personnel of the time of the initial aircraft report and the estimated time a second aircraft report could be obtained. b. When an aircraft reports a GPS anomaly, request the following information and/or take the following actions:
1. Record the following minimum information: (a) Aircraft call sign and type. (b) Location. (c) Altitude. (d) Date/time of occurrence. 2. Record the incident on FAA Form 7230−4 or appropriate military form. 3. Broadcast the anomaly report to other aircraft as necessary. PHRASEOLOGY− ATTENTION ALL AIRCRAFT, GPS REPORTED UNRELIABLE IN VICINITY/AREA (position). EXAMPLE− “Attention all aircraft, GPS reported unreliable in the area 30 miles south of Waco VOR.” c. When an aircraft reports a Wide Area Augmentation System (WAAS) anomaly, request the following information and/or take the following actions: 1. Determine if the pilot has lost all WAAS service. PHRASEOLOGY− ARE YOU RECEIVING ANY WAAS SERVICE? 2. If the pilot reports receipt of any WAAS service, acknowledge the report and continue normal operations. 3. If the pilot reports loss of all WAAS service, report as a GPS anomaly using procedures in subpara 2−1−10b.