(d) Licensee notification of compliance. A licensee who commences service or operations within the construction period or meets its coverage or substantial service obligations within the coverage period must notify the Commission by filing FCC Form 601. The notification must be filed with the Commission within 15 days of the expiration of the applicable construction or coverage period. Where the authorization is site-specific, if service or operations have begun using some, but not all, of the authorized transmitters, the notification must show to which specific transmitters it applies.