Judgment_paragraph 72 · Caisse de retraite du personnel navigant professionnel de l'aéronautique civile (CRPNPAC) v Vueling Airlines SA v Vueling Airlines SA and Jean-Luc Poignant (C-370/17, C-37/18)

72It follows that where there is concrete evidence indicating that E 101 certificates have been fraudulently obtained or relied upon, what the competent institution of the host Member State should do is not to identify unilaterally a fraud and disregard those certificates, but rather to initiate promptly the procedure laid down in Article 84a(3) of Regulation No 1408/71, so that the institution that issued those certificates, the matter having been referred to it by the institution of the host Member State, may undertake, within a reasonable period, in accordance with the principle of sincere cooperation, a review of the grounds for the issue of those certificates in the light of that evidence and, where appropriate, decide to cancel or withdraw those certificates, as is clear from the case-law cited in paragraph 64 of the present judgment (see, to that effect, judgment of 6 February 2018, Altun and Others, C‑359/16, EU:C:2018:63, paragraph 54).