Radiotelegraph Operator's Certificate who has had at least six months service as a radio officer on board U.S. ships. If the radiotelegraph station does not have an auto alarm, a second radio officer who holds a Radiotelegraph Operator's Certificate, First Class Radiotelegraph Operator's Certificate, or Second Class Radiotelegraph Operator's Certificate must be carried. * * * * * 26. Section 80.169 is amended by revising paragraphs (a) and (b) to read as follows: § 80.169 Operators required to adjust transmitters or radar. (a) All adjustments of radio transmitters in any radiotelephone station or coincident with the installation, servicing, or maintenance of such equipment which may affect the proper operation of the station, must be performed by or under the immediate supervision