ART9 – 54 – Section II − Procedure for effecting coordination12, 13 Sub-Section IIB − Acknowledgement of receipt of a request for coordination MOD 9.47 If there is no acknowledgement of receipt within 30 days after the Bureau’s action under No. 9.46, the Bureau shall immediately send a reminder providing an additional 15-day period for the response. In the absence of such an acknowledgement within 15 days, it shall be deemed that the administration which has failed to acknowledge receipt has undertaken: (WRC-15) Sub-Section IIC − Action upon a request for coordination MOD 9.50 An administration having received a request for coordination under Nos. 9.7 to 9.21, or having been included in the procedure following action under No. 9.41, shall promptly examine the matter with regard to interference which may be caused to or, in certain cases, by its own assignments23, identified in accordance with Appendix 524, 24bis. (WRC-15) ADD _________________ 24bis 9.50.3 See also No. 9.52.1. (WRC-15) MOD 9.52 If an administration, following its action under No. 9.50, does not agree to the request for coordination, it shall, within four months of the date of publication of the BR IFIC under No. 9.38, or of the date of dispatch of the coordination data under No. 9.29, inform the requesting administration of its disagreement24ter and shall provide information concerning its own assignments upon which that disagreement is based. It shall also make such suggestions as it is able to offer with a view to satisfactory resolution of the matter. A copy of that information shall be sent to the Bureau. Where the information relates to terrestrial stations or earth stations operating in the opposite direction of transmission within the coordination area of an earth station, only that information relating to existing radiocommunication stations or to those to be brought into use within the next three months for terrestrial stations, or three years for earth stations, shall be treated as notifications under Nos. 11.2 or 11.9. (WRC-15)