speakers on boat and embarkation decks will render not more than half of the loudspeakers in the group inoperative. This may be accomplished by feeding the loudspeakers of a particular group alternately from a port and starboard multiconductor cable.

(b) Cable runs shall, where possible, be located in passageways and shall avoid staterooms, lockers, and other enclosed spaces.

§ 113.50-25 Type of cable and equipment enclosures.

(a) All cable used in connection with the system shall be either leaded and armored, impervious sheathed and armored or mineral insulated metal sheathed.

(b) All junction or connection boxes employed in the distribution system shall be of watertight construction.

§ 113.50-30 Shipboard tests.

(a) The operation of the system shall be observed to determine that voice reproduction is of good quality and intelligibility of a high order.

(b) Sound levels shall be measured with a sound level meter to demonstrate that the levels listed in Table 113.50-15 are met.

(1) Where the ground noise level with the vessel under way in moderate weather is in excess of the values listed in Table 113.50-15, the signal and voice ievels shall be increased correspondingly so that the differential between ground noise level and the signal and voice levels shall be not less than the differential given in this table.

(c) It shall be demonstrated that grounding either conductor or "shorting" both conductors to any one lifeboat station loudspeaker, or to an embarkation deck loudspeaker, will not reduce the output of any one of the remaining loudspeakers by more than 3 decibels.

§ 113.50-35 Operation of emergency loudspeaker systems.

(a) The emergency loudspeaker system shall be used at the discretion of the master and shall function entirely independently of any public address or music distribution system.

(b) The emergency loudspeaker system shall not be used for entertainment purposes.

(c) The complete emergency loudspeaker system shall be given an operating test at least once every week. These tests shall be made by a licensed officer and the condition of the equipment entered in the vessel's log.

(d) When a vessel is equipped with a public address or music distribution system, means shall be provided adjacent to the emergency loudspeaker system control panel to silence the public address or music distribution systems.

§ 113.50-90 Emergency loudspeaker systems for existing vessels.

(a) Existing vessels. Emergency loudspeaker systems on ocean and coastwise passenger vessels contracted for prior to November 19, 1952, shall meet the requirements of this section.

(b) General requirements. (1) All passenger vessels the construction of which was begun prior to January 1, 1937, on which lifeboats are stowed more than 100 feet from the navigating bridge, and all passenger vessels the construction of which was begun prior to November 19, 1952, but on and after January 1, 1937, certificated to carry 1,000 persons or more, including officers and crew, shall be equipped with a loudspeaker system which shall enable an officer on the bridge to broadcast separately or collectively to the stations listed in this subparagraph.

(i) Lifeboat stations, port and starboard. (The deck or decks on which lifeboats are stowed and from which they are launched.)

(ii) Embarkation deck, port and starboard. (The deck or decks, designated by construction design or by the vessel's station bill, used for the embarkation of passengers and crew into lifeboats. If lifeboat stations are used for embarkation purposes, this requirement will be omitted.)

(iii) Main quarters for crew. (The quarters of the emergency squad, deck crew, and stewards assigned to passenger quarters.)

(iv) Public spaces. (The spaces designated by the vessel's station bill where

passengers and crew are to assemble in an emergency.)

(v) Accommodation spaces and service spaces.

(2) The Commandant may, in special cases, exempt passenger vessels the construction of which was begun prior to January 1, 1937, having a small number of especially accessible lifeboats stowed more than 100 feet from the bridge: Provided, however, That no such vessel certificated to carry more than 200 persons, including officers and crew, shall be so exempted.

(3) Details of the system shall be in general agreement with §§ 113.50-5 through 113.50-35 insofar as is reasonable and practicable.

(4) Existing arrangements, materials, and facilities previously approved, but not meeting the applicable specifications or requirements set forth in §§ 113.50-5 through 113.50-35, may be continued in service so long as they are maintained in good condition to the satisfaction of the Officer in Charge, Marine Inspection. Minor repairs and minor alterations may be made to the same standards as the original installation provided that, in no case, will a greater departure from the standards of §§ 113.50-50 through 113.5035 be permitted than presently exist. All new installations or major replacements shall meet the applicable specifications or requirements, for new vessels.

[CGFR 65-50, 30 F.R. 17089, Dec. 30, 1965, as amended by CGFR 67-87, 32 F.R. 19183, Dec. 20, 1967]

Subpart 113.55-Navigation Lights § 113.55-1

Application.

(a) The provisions of this subpart, with the exception of § 113.55-90, shall apply to all vessels contracted for on or after November 19, 1952. Vessels contracted for prior to November 19, 1952, shall meet the requirements of § 113.5590.

§ 113.55-5 General requirements.

(a) All vessels and motorboats shall be equipped with navigation lights and

(a) Navigation lights shall be installed in such a manner that the angles of visibility and the minimum heights above the deck required by the applicable Rules of the Road will be assured.

(b) The light from a navigation light shall not be obscured by any part of the vessel's structure or rigging.

(c) Navigation lights shall be wired by means of a short length of heavy duty portable cable to a watertight receptacle outlet located adjacent thereto. Where the double lens, two-lamp type electric navigation light is installed, each lamp shall be connected to its branch circuit conductors by means of an individual portable cable and receptacle plug.

§ 113.55-20 Light screens.

(a) Light screens required by the Rules of the Road for port and starboard side lights shall be painted with a glossy black paint and shall project not less than three feet forward of the center of the light source.

§ 113.55-25 Navigation light indicator panel.

(a) Self-propelled vessels of 1,600 gross tons and over shall be provided with a navigation light indicator panel located in the wheelhouse to control electric side, masthead, range, and stern lights. The panel shall provide visible and audible indications of the failure of any of the above named navigation lights.

(b) Recommended circuit diagrams for navigation light indicator panels are shown in Figure 113.55-25 (b). Other circuit diagrams may be submitted for approval.

SEMI-AUTOMATIC NAVIGATION
LINE PANELS FOR PORT AND
STARBOARD SIDE LIGHTS,
MASTHEAD, RANGE, AND STERN
HTS

DOUBLE FILAMENT DOUBLE LENS, DOUBLE
LAMP TYPE
LAMP TYPE

LIGHT PANEL CIRCUITS

UNE PANELS FOR ANCHOR TOWING, AND NOT-UNDER-COMMAND LIGHTS

[CGFR 67-91, 32 F.R. 20812, Dec. 27, 1967]

§ 113.55-90 Navigation lights for existing vessels.

(a) Navigation lights on vessels contracted for prior to November 19, 1952, shall meet the requirements covered in this section.

(b) Existing arrangements, materials, and facilities previously approved will be considered satisfactory so long as they are maintained in good condition to the satisfaction of the Office in Charge, Marine Inspection. Minor repairs and minor alterations may be made to the same standard as the original installation.

(c) All new installations or major replacements shall meet the applicable specifications or requirements.

Subpart 113.60-Signaling Lights § 113.60-1 Application.

(a) The provisions of this subpart, with the exception of § 113.60-90, shall apply to vessels contracted for on or after November 19, 1952. Vessels contracted for prior to November 19, 1952, shall meet the requirements of § 113.60-90.

§ 113.60-5 General requirements.

(a) Except as modified by § 33.50-1 of Subchapter D (Tank Vessels) of this

chapter, all ocean and coastwise selfpropelled vessels of over 150 gross tons shall be equipped with an efficient daylight signaling light of the type covered by this subpart.

§ 113.60-10 Detail requirements.

(a) The signaling light shall consist of a device which produces a narrow high-intensity beam of light suitable for daylight blinker communication at speeds up to 9 words (180 dots and/or dashes) per minute.

(b) The axial candlepower of the beam shall be not less than 60,000 candlepower. The beam shall have a total horizontal and vertical divergence of approximately 6 degrees. This divergence is defined as the angular limits of the beam where the candlepower has fallen to one-tenth of the axial candlepower.

(c) In addition to the requirements of paragraph (b) of this section, the candlepower of the beam in every direction within an angle of 0.7 degree from the axial shall not be less than 50 percent of the axial candlepower.

(d) The signaling light shall be fitted with a suitable sighting arrangement capable of directing the beam on to the receiving station.

(e) Signaling may be effected by keying the current through the lamp, by movement of shutters, or by other approved means.

(f) The signaling light may be either a fixed unit mounted on the top of the wheelhouse, a semi-fixed unit with arrangements for quick mounting at either wing of the navigating bridge, or a portable unit.

(g) Fixed or semifixed signaling lights shall be energized from the emergency lighting and power system as required by 112.15-5 (h) of this subchapter. Portable signaling units shall be energized from a self-contained storage battery capable of operating the unit 2 hours continuously without recharging. § 113.60-90 Signaling light for existing vessels.

(a) Signaling lights on vessels contracted for prior to November 19, 1952, shall meet the requirements in this section.

(b) Ocean and coastwise ships over 150 gross tons shall be equipped with an

efficient signaling lamp. This lamp shall be permanently fixed above the bridge and equipped with a Fresnel lens and high-speed bulb, operated by a weatherproof key, fitted with a suitable condenser. The lamp shall be so connected that it can be operated from the normal source of ship's current, the emergency source, and other emergency batteries if provided.

(c) Existing arrangements, materials, and facilities previously approved will be considered satisfactory as long as they are maintained in good condition to the satisfaction of the Officer in Charge, Marine Inspection. Minor repairs and minor alterations may be made to the same standard as the original installation. All new installations or major replacements shall meet the applicable specifications or requirements for new vessels.

Subpart 113.65-Whistle Operators § 113.65-1 Application.

(a) The provisions of this subpart, with the exception of § 113.65-90, shall apply to all vessels contracted for on or after November 19, 1952. Vessels contracted for prior to November 19, 1952, shall meet the requirements of § 113.65

90.

§ 113.65-5 General requirements.

(a) The general requirements for whistles, sirens and foghorns are contained in Part 25 of Subchapter C (Uninspected Vessels), Part 32 of Subchapter D (Tank Vessels), Part 77 of Subchapter H (Passenger Vessels), and Part 96 of Subchapter I (Cargo and Miscellaneous Vessels), of this chapter.

(b) Mechanical whistle or siren pull leads shall be as direct as possible and amply protected. When the leads are suspended for more than 15 feet, they should be supported from a corrosionresistant cable with suitable bearers. The system shall be provided with ample corrosion-resistant springs to relieve all weight on the lever and for the proper functioning of the system.

(c) Materials and mechanical details shall be in general accordance with the requirements for mechanical telegraphs given in § 113.35-25 except that bronze