46 C.F.R. Subpart 113.43—Steering Failure Alarm Systems
Title 46 - Shipping
This subpart applies to each vessel of 1600 gross tons and over that has power driven main or auxiliary steering gear. (a) Each vessel must have a steering failure alarm system that actuates an audible and visible alarm in the pilothouse when the actual position of the rudder differs by more than 5 degrees from the rudder position ordered by the followup control systems, required by part 58, subpart 58.25, of this chapter, for more than: (1) 30 seconds for ordered rudder position changes of 70 degrees; (2) 6.5 seconds for ordered rudder position changes of 5 degrees; and (3) The time period calculated by the following formula for ordered rudder positions changes between 5 degrees and 70 degrees: t = (R/2.76)+4.64
Where t = maximum time delay in seconds R = ordered rudder change in degrees (b) The alarm system must be separate from, and independent of, each steering gear control system, except for input received from the steering wheel shaft. [CGD 74–125A, 47 FR 15272, Apr. 8, 1982, as amended by CGD 94–108, 62 FR 23910, May 1, 1997; USCG–2004–18884, 69 FR 58348, Sept. 30, 2004] Each steering failure alarm system must be supplied by a circuit that: (a) Is independent of other steering gear system and steering alarm circuits; (b) Is fed from the final emergency power source through the emergency distribution panel in the wheelhouse, if installed; and (c) Has no overcurrent protection except short-circuit protection by an instantaneous fuse or circuit breaker rated or set at 400 to 500 percent of: (1) The current-carrying capacity of the smallest alarm system interconnecting conductors; or (2) The normal load of the system.
Title 46: Shipping
PART 113—COMMUNICATION AND ALARM SYSTEMS AND EQUIPMENT
Subpart 113.43—Steering Failure Alarm Systems
§ 113.43-1 Applicability.
§ 113.43-3 Alarm system.
§ 113.43-5 Power supply.
