(a) This section does not apply to an excepted vessel as defined in §136.110 of this subchapter.

(b) Each towing vessel must be fitted with a general alarm that:

(1) Is activated at each operating station and can notify persons onboard in the event of an emergency;

(2) Is capable of notifying persons in any accommodation, work space, and the engine room;

(3) Has installed, in the engine room and any other area where background noise makes a general alarm hard to hear, a supplemental flashing red light that is identified with a sign that reads: “Attention General Alarm—When Alarm Sounds or Flashes Go to Your Station”; and

(4) A public-address (PA) system or other means of alerting all persons on the towing vessel may be used in lieu of the general alarm in paragraph (b) of this section if the system meets the requirements of paragrahs (b)(2) and (3) of this section.