Coast Guard, DHS § 113.37–5

(3) Has a means to reduce the audible the case of a transmitter, the acknowl- signal from 100 percent to not less than edgment of an order. The audible signal 50 percent. device must not be dependent upon any [CGD 74–125A, 47 FR 15272, Apr. 8, 1982, as source of power for operation other amended by CGD 94–108, 61 FR 28290, June 4, than that of the movement of the 1996] transmitter or indicator handle.

§ 113.35–7 Electric engine order tele- [CGD 74–125A, 47 FR 15272, Apr. 8, 1982, as graph systems; operations. amended by CGD 94–108, 61 FR 28290, June 4, 1996] (a) Where two or more transmitters, located on or on of, or on the wings § 113.35–13 Mechanical engine order of, the navigating bridge operate a telegraph systems; operation. common indicator in the engineroom, If more than one transmitter oper- the transmitters must: ates a common indicator in the (1) Operate in synchronism as re- engineroom, all the transmitters must quired in paragraph (b) of this section; be mechanically interlocked and oper- or ate in synchronism. A failure of the (2) Operate under the control of a transmission wire or chain at any transmitter transfer control in accord- transmitter must not interrupt or dis- ance with paragraph (c) of this section. able any other transmitter. (b) All transmitter handles and pointers must operate in synchronism. § 113.35–15 Mechanical engine order Where the transmitters are mechani- telegraph systems; application. cally interlocked to effect synchronous operation, the requirements of § 113.35– If a mechanical engine order tele- 13 must be met. graph system is installed on any vessel (c) Except for a transmitter in an un- to provide the communication required attended navigating bridge on a dou- by this subpart, the length of cables or ble-ended vessel, each transmitter other mechanical limitations must not must operate under the control of a prevent the efficient operation of the transmitter transfer control so that system. movement of any one transmitter han- dle automatically connects that trans- § 113.35–17 Vessels with navigating bridge control. mitter electrically to the engineroom indicator and simultaneously dis- Each vessel with navigating bridge connects electrically all other trans- throttle control must have a positive mitters. The reply pointers of all trans- mechanical stop on each telegraph mitters must operate in synchronism transmitter that prevents movement at all times. to the ‘‘Navigating Bridge Control’’ po- (d) On a double-ended vessel that has sition without positive action by the two navigating bridges, a manually op- operator. erated transfer switch which will dis- [CGD 74–125A, 47 FR 15272, Apr. 8, 1982, as connect the system in the unattended amended by CGD 94–108, 61 FR 28290, June 4, navigating bridge must be provided. 1996] [CGD 74–125A, 47 FR 15272, Apr. 8, 1982. Redes- ignated and amended by CGD 94–108, 61 FR Subpart 113.37—Shaft Speed and 28290, June 4, 1996] Thrust Indicators § 113.35–9 Mechanical engine order telegraph systems. § 113.37–1 Applicability. (a) Each mechanical engine order This subpart applies to all self-pro- telegraph system must consist of pelled vessels. transmitters and indicators mechani- cally connected to each other, as by § 113.37–5 General requirements. means of chains and wires. (a) A vessel equipped with fixed pitch (b) Each transmitter and each indi- propellers must have on the navigating cator must have an audible signal de- bridge and at the engineroom control vice to indicate, in the case of an indi- station a propeller speed and direction cator, the receipt of an order, and in indicator for each shaft.

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(b) A vessel equipped with control- it is readily visible by the helmsman at lable pitch propellers must have on the the steering stand. navigating bridge and at the (b) Each electric component or its engineroom control station a propeller enclosure must meet Type 4 or 4X of speed and pitch position indicator for NEMA 250 or IP 56 of IEC 60529 (both in- each shaft. corporated by reference; see 46 CFR [CGD 74–125A, 47 FR 15272, Apr. 8, 1982, as 110.10–1) requirements. amended by CGD 94–108, 61 FR 28290, June 4, [CGD 74–125A, 47 FR 15272, Apr. 8, 1982, as 1996] amended by CGD 94–108, 61 FR 28290, June 4, 1996; 62 FR 23910, May 1, 1997; USCG–2003– § 113.37–10 Detailed requirements. 16630, 73 FR 65202, Oct. 31, 2008] (a) Each indicator must be inde- pendent of the propulsion control sys- Subpart 113.43—Steering Failure tem. A failure of the propulsion control system must not affect the operation Alarm Systems of the indicators. § 113.43–1 Applicability. (b) Each electric component or its enclosure must meet Type 4 or 4X of This subpart applies to each vessel of NEMA 250 or IP 56 of IEC 60529 (both in- 1600 gross tons and over that has power corporated by reference; see 46 CFR driven main or auxiliary steering gear. 110.10–1) requirements. § 113.43–3 Alarm system. [CGD 74–125A, 47 FR 15272, Apr. 8, 1982, as amended by CGD 94–108, 61 FR 28290, June 4, (a) Each vessel must have a steering 1996; USCG–2003–16630, 73 FR 65202, Oct. 31, failure alarm system that actuates an 2008] audible and visible alarm in the pilot- house when the actual position of the Subpart 113.40— Angle rudder differs by more than 5 degrees Indicator Systems from the rudder position ordered by the followup control systems, required by § 113.40–1 Applicability. part 58, subpart 58.25, of this chapter, This subpart applies to self-propelled for more than: vessels. (1) 30 seconds for ordered rudder posi- tion changes of 70 degrees; § 113.40–5 General requirements. (2) 6.5 seconds for ordered rudder po- The position of the rudder, if power- sition changes of 5 degrees; and operated, must be shown at the prin- (3) The time period calculated by the cipal steering station. If there is non- following formula for ordered rudder follow-up steering control at the alter- positions changes between 5 degrees native steering station, there must be and 70 degrees: a separate sys- t = (R/2.76)+4.64 tem for that station that is electrically independent from each other rudder Where angle indicator system. t = maximum time delay in seconds R = ordered rudder change in degrees § 113.40–10 Detailed requirements. (b) The alarm system must be sepa- (a) Each rudder angle indicator sys- rate from, and independent of, each tem must have a transmitter at the steering gear control system, except rudder that is actuated by move- for input received from the steering ment of the rudder with the angular wheel shaft. movements of the rudder transmitted to a remote indicator or indicators. [CGD 74–125A, 47 FR 15272, Apr. 8, 1982, as This system must be independent of all amended by CGD 94–108, 62 FR 23910, May 1, other systems and not receive power or 1997; USCG–2004–18884, 69 FR 58348, Sept. 30, signal from the steering gear control, 2004] autopilot, or dynamic positioning sys- tems. However, the indicator may be § 113.43–5 Power supply. physically located on a control console, Each steering failure alarm system such as an integrated bridge system, if must be supplied by a circuit that:

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