Page:United States Statutes at Large Volume 49 Part 2.djvu/1650

 3656 CERTIFICATES OF AIR\VORTHINESS-GREAT BRITAIY. particular aircraft) and of the normal engine consumption of petrol and oil' (3) rigging particulars where applicable. (c) 1." weight schedule" showing the ascertained tare weight of the particular aircraft with details of all the items that are included in the tare weight and the individual weights of each of the remov- able items so included; this" weight schedule" or one of the docu- ments referred to at (a) or (b) above will also contain particulars of the ascertained position of the centre of gravity of the particular type of aircraft in the "tare " condition, and will define the limits between which the centre of gravity may be allowed to move. 5. A validation conferred by the competent United States au- thorities in accordance with the terms of this Note will, on expiry, be renewed under the conditions laid down for the renewal of United States licences. Reference to the United Kingdom authorities will not be made unless special circumstances require it in any particular case. 6. The competent United States authorities shall have the right to make the validation of United Kingdom certificates dependent on the fulfilment of any special condition8 which are for the time being required for the issue of aircraft licences in the United States. Information with regard to these special conditions will from time to time be communicated to the competent United Kingdom authorities. 7. The competent United States authorities may at any time revise their standard of airworthiness. Any such revised standard may, as in the case of other aircraft, be enforced in respect of aircraft whose certificates of airworthiness are validated in accordance with the terms of this Note. Facilities will be given as and when neces- sary for referring the particular problems arising from any such revised standard to the authorities responsible for the approval of the original design of the aircraft. 8. The competent United States authorities shall be free to give special consideration to any type of aircraft which in practice ap- pears to them to be unsafe and, if they consider it necesEary, to with- hold or suspend validation. 9. The competent United Kingdom authorities shall afford to the competent United States authorities the fullest opportunity from time to time to satisfy themselves regarding the standards as to materials, structural conditions, inspectional methods, etc., laid down and enforced in the United Kingdom. 10. The competent United Kingdom authorities shall keep the com- petent United States authorities fully and currently informed of all regulations in force in regard to the airworthiness of civil aircraft and any changes therein that may from time to time be effected. 11. (a) The competent United Kingdom authorities shall arrange for the effective communication to the competent United States authorities of particulars of "compulsory modifications" prescribed in the United Kingdom, for the purpose of enabling the United States authorities to require, should they see fit, these modifications to be made to aircraft of the types affected, whose certificates have been yulidated by them.