{"data":{"id":"us/46-cfr-62.35-50","jurisdiction":"us","citation":"46 CFR 62.35-50","heading":"-50 Tabulated monitoring and safety control requirements for specific systems.","body":"The minimum instrumentation, alarms, and safety controls required for specific types of systems are listed in table 1 to § 62.35-50. The ABS Marine Vessel Rules (incorporated by reference; see § 62.05-2) required for engineering systems are also listed in table 1 to § 62.35-50.\n(a) Safety limit controls must be provided in navigating bridge primary propulsion control systems. See § 62.35-5(c).\n(b) Safety trip controls and alarms must be provided for all main boilers, regardless of mode of operation. See § 62.35-20(a).\n(c) Loss of forced lubrication safety trip controls must be provided for main propulsion turbines and main propulsion diesel engines.\n(d) Override of overspeed and loss of forced lubrication pressure safety trip controls must not be provided for main propulsion or generator steam or gas turbines, or diesel engines. See § 62.35-5(e)(2).\n(e) Transfer interlocks must be provided for main propulsion systems capable of remote and local control.\n(f) Semiconductor controlled rectifiers must have current limit controls.\n(g) Interlocks must be provided to prevent the starting of engines or turbines while the jacking or turning gear, if installed, is engaged. See § 62.25-5(a).\n(h) Main and remote-control stations, including the navigational bridge, must provide visual and audible alarms in the event of a fire in the main machinery space.\n(i) Minimally attended and periodically unattended machinery plants must be provided with a personnel alarm that annunciates on the bridge if not acknowledged by the watch engineer. See § 62.50-20(b)(1).\n(j) All automatic controls and alarms must be failsafe to the least critical consequence for the particular system. See § 62.30-1.\n(k) The operating or tripped status of vital auxiliary boilers must be indicated at the ECC. See part 63 of this subchapter.\nTable 1 to § 62.35-50—Minimum System Monitoring and Safety Control Requirements for Specific Systems\nSystem Service Instrumentation Alarm Safety control See also paragraph\nMain (Propulsion) boiler ABS Marine Vessel Rules Part 4-9-6 tables 1A, 1B and 5A ABS Marine Vessel Rules Part 4-9-6 tables 1A, 1B and 5A ABS Marine Vessel Rules Part 4-9-6 tables 1A, 1B and 5A (a)\nBurner seating Failure Burner auto trip (b)\nTrial for ignition Status Failure Burner auto trip (b)\nManual trip (b)\nLow fire interlock Status\nProgram control interlock Status\nMain (Propulsion steam) turbine ABS Marine Vessel Rules Part 4-9-6 table 2 ABS Marine Vessel Rules Part 4-9-6 table 2 ABS Marine Vessel Rules Part 4-9-6 table 2 Manual trip (c), (d)\nMain propulsion, diesel ABS Marine Vessel Rules Part 4-9-6 tables 1A, 1B and 5A ABS Marine Vessel Rules Part 4-9-6 tables 1A, 1B and 5A ABS Marine Vessel Rules Part 4-9-6 tables 1A, 1B and 5A Manual trip (c), (d)\nMain propulsion, remote control Failure Manual trip\nAuto safety trip override Activated\nStarting power Pressure (voltage) Low Limit (a)\nLocation in control Status Override (c)\nShaft speed/direction/pitch See § 113.37 of this chapter. See § 113.37 of this chapter. See § 113.37 of this chapter.\nClutch fluid Pressure Low\nMain propulsion, electric (1) ABS Marine Vessel Rules Part 4-9-6, tables 4A and 4B ABS Marine Vessel Rules Part 4-9-6, tables 4A and 4B ABS Marine Vessel Rules Part 4-9-6, tables 4A and 4B ABS Marine Vessel Rules Part 4-9-6, tables 4A and 4B (f)\nMain propulsion, shafting Stern tube oil tank level Low\nLine shaft bearing Temperature High\nForced lubrication Pressure Low\nMain propulsion, controllable pitch propeller Hydraulic oil Pressure High, Low\nTemperature High\nGenerators Ship service ABS Marine Vessel Rules Part 4-9-6, table 6 ABS Marine Vessel Rules Part 4-9-6, table 6\nStarting pressure/voltage Low\nTripped\nEmergency 2\nTurbogenerator ABS Marine Vessel Rules Part 4-9-6, table 6 ABS Marine Vessel Rules Part 4-9-6, table 6 ABS Marine Vessel Rules Part 4-9-6, table 6\nManual trip\nDiesel ABS Marine Vessel Rules Part 4-9-6, table 6 ABS Marine Vessel Rules Part 4-9-6, table 6 ABS Marine Vessel Rules Part 4-9-6, table 6 (d)\nManual trip\nAuxiliary boiler Run Trip (k)\nGas turbine 3 ABS Marine Vessel Rules Part 4-9-6, Tables 3 and 6 ABS Marine Vessel Rules Part 4-9-6, Tables 3 and 6 ABS Marine Vessel Rules Part 4-9-6, Tables 3 and 6 ABS Marine Vessel Rules Part 4-9-6, Tables 3 and 6 (d)\nEngines and turbines Jacking/turning gear Engaged (g)\nFuel oil ABS Marine Vessel Rules Part 4-9-6, tables 5A and 6 ABS Marine Vessel Rules Part 4-9-6, tables 5A and 6 ABS Marine Vessel Rules Part 4-9-6, tables 5A and 6\nRemote/auto fill level High Auto trip or overflow arrangement\nHi. press. leakage level High\nBilge Pump remote control Run\nPump auto control Run Excessive operations\nLevel High/location\nMachinery space Class 3 (power-operated) watertight doors Open/closed\nFire detection Machinery spaces Space on fire (h)\nFire main Pressure Low\nPersonnel Deadman Fail to acknowledge (i)\nGeneral, control and alarm systems Power supply Available (pressure) Failure (low)\nSystem function Failure (j)\nConsole air conditioning Failure\nBuilt in test equipment Active\nSequential interlock Activated\nSafety control Activated Auto trip/limit (j)\nRedundant auxiliary, system, power supply Status Auto transfer\n1 See subparts 111.33 and 111.35 of this chapter.\n2 See subparts 112.45 and 112.50 of this chapter.\n3 See § 58.10-15(f) of this subchapter.","path":["Title 46—Shipping","CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY","SUBCHAPTER F—MARINE ENGINEERING","PART 62—VITAL SYSTEM AUTOMATION","Subpart 62.35—Requirements for Specific Types of Automated Vital Systems"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-46.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:22Z","sha256":"bc13841f584f1cc1cd2618b855e76365ffc58f830d7f50083622791f775bb71a","source_id":"us-cfr","stale":true,"prev":"us/46-cfr-62.35-40","next":"us/46-cfr-62.50-1"},"notice":"GroundRules: Original legal text. Not legal advice."}