## Article 18 Commencement order 

18.1 The contracting authority shall inform the contractor by administrative order of the date on which implementation of the tasks shall begin. 

## Article 19 Period of implementation of the tasks 

19.1 For Lot 1: The implementation period will last 255 calendar days, starting from the date of the signature of the contract by both parties and ending on the day of issuance of the certificate of Provisional Acceptance. The implementation period will include delivery period of 180 calendar days, installation, commissioning and training period of 30 days after delivery, issuance of Provisional Acceptance period of 45 days after completion of all services. 

For Lot 2: The implementation period will last 345 calendar days, starting from the date of the signature of the contract by both parties and ending on the day of issuance of the certificate of Provisional Acceptance. The implementation period will include delivery period of 270 calendar days, installation, commissioning and training period of 30 days after delivery, issuance of Provisional Acceptance period of 45 days after completion of all services. 

For Lot 3: The implementation period will last 205 calendar days, starting from the date of the signature of the contract by both parties and ending on the day of issuance of the certificate of Provisional Acceptance. The implementation period will include delivery period of 130 calendar days, installation, commissioning and training period of 30 days after delivery, issuance of Provisional Acceptance period of 45 days after completion of all services. 

For Lot 4: The implementation period will last 165 calendar days, starting from the date of the signature of the contract by both parties and ending on the day of issuance of the certificate of Provisional Acceptance. The implementation period will include delivery period of 90 calendar days, installation, commissioning and training period of 30 days after delivery, issuance of Provisional Acceptance period of 45 days after completion of all services. 

## Article 26 General principles for payments 

26.1 Payments shall be made in euros. 

Payments shall be authorised and made by Ministry of Industry and Technology - DG for EU and Foreign Affairs - Directorate of EU Financial Programmes (MoIT-DoEUFP), Mustafa Kemal Mahallesi, Dumlupınar Bulvarı, (Eskişehir Yolu 7. Km), 2151.Cadde, No:154/A, Kat:7, 06510 Çankaya/Ankara, Turkey. 

26.3 By derogation, the final payment to the contractor of the amounts due shall be made within 90 days after receipt by the contracting authority of an invoice and of the application for the certificate of provisional acceptance. 

26.5 In order to obtain payments, the contractor must forward to the authority referred to in paragraph 26.1 above: 

a) For the 40% pre-financing, the pre-financing guarantee. 

b) For the 60 % balance, the invoice(s) in triplicate together with the request for provisional acceptance of the supplies. 

