Although some lighting technicians try to please their clients by instituting a quick and competitive repair by installing similar lighting system components that were immediately available in their service vehicle, it's not advisable. The quick fix has often turned into a long running warranty feud when the original equipment manufacturer's replacement products are not used. In addition, there is no way to confirm that the lighting system is still ETL compliant. It was the FAA's position that aviation obstruction lighting systems that have been serviced using non-original equipment manufacturers' parts are no longer in compliance with FAA specifications of FCC regulations. However, on November 12, 2004 the FAA announced that it was setting up a policy for non-OEM parts manufacturers so that they could certify their products. The FAA has stated that further public input and further study by the agency was necessary to assess the adequacy of existing guidance in FAA advisory circulars pertaining to obstruction lighting, and the need for any changes in such guidance. The deadline for offering comments was January 11, 2005, although later remarks might be considered depending upon their relevancy.