For the purpose of issuing a certificate for a pusher or pusher tug, or of endorsing the certificate of a powered vessel or rug with "suitable for pushing", it is for the competent authority to decide whether, and which, trains are to be submitted for tests, and to carry out tests with those formations which it regards as the most unfavourable.
Zaradi izdaje spričevala za potisna plovila ali potisne vlačilce ali zaradi vpisa motornega plovila ali vlačilca kot "primernega za potiskanje" v spričevalo pristojni organ odloči, ali in katere naveze je treba preskusiti, ter preskusi formacije, ki se štejejo kot najmanj ugodne.