Division (a) The letter of agreement must state the period of time for which it is issued, which must not exceed one year. It remains valid subject to the following conditions:F1

the production organisation continues to comply with the applicable requirements of this Annex;

the production organisation, and its suppliers and contractors as appropriate, permit the CAA to carry out investigations in accordance with point 21.A.8;

the production organisation provides the CAA with evidence showing it maintains satisfactory control of the manufacture of products, parts and appliances under the letter of agreement;

the letter of agreement has not been revoked by the CAA under point 21.B.65 or surrendered by the production organisation, and its duration has not expired.