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Kongsberg Maritime

K-Bridge BNWAS

BNWAS · Navigation & Bridge Equipment

Technical data from manufacturer or class sources · not yet verified by a person​​​​‍​​‌​‍‌‌⁠​‍‍⁠⁠⁠⁠
Heading/Track Control per IMOCapacity
Ship Steering ControlMedium

The K-Bridge BNWAS is an integrated Bridge Navigational Watch Alarm System that monitors bridge activity and issues visual/audible alerts if the watch officer fails to respond, ensuring compliance with IMO SOLAS requirements.

Service

Service notes.

What our service work and the manufacturer documentation say about keeping this model running.

Servicing per the manufacturer's manual and classification society requirements. Annual inspection at class survey. Stock spare parts as specified by the manufacturer.

Inspection

Common failures & inspection points

Inspection

Inspector Detail

Common issues

  • Reset button/switch wear or failure to register operator presence
  • False alarms from sensor misconfiguration or vibration-sensitive detection
  • Backup alarm relay to the public address/crew alarm not tested and found non-functional
  • Firmware requiring update after bridge integration changes
  • Wiring or connector corrosion at bridge wing repeater panels
  • Battery backup failure for the alarm unit

Inspection checklist

  • Test the full alarm sequence timing (first stage, second stage bridge, third stage crew/master alarm) against SOLAS-required intervals
  • Verify all reset points, including bridge wing repeaters if fitted, function correctly
  • Check indication and dimming of lamps on the control unit
  • Test the backup power supply and confirm the alarm still functions on battery
  • Verify the alarm escalates correctly to the crew alarm/PA system
  • Check the event log/recording function if fitted
  • Confirm any interface with autopilot/steering operates correctly where linked

Service intervals

Full function test of all stages and resetsmonthly, and before each survey
Battery backup check/replacementannually or per the maker's battery life
Software/firmware version checkat each annual service or per maker bulletins

Typical intervals for this design class, not the manufacturer’s figures for your model. The manufacturer’s manual is binding.

Critical spares

  • Reset switch/button unit
  • Backup battery pack
  • Control unit fuse set
  • Bridge wing repeater unit, if fitted

Safety

  • BNWAS is a statutory safety system - never disable or permanently mute the crew alarm stage
  • Verify alarm audibility actually reaches crew accommodation before accepting the installation as compliant
  • Do not treat a silenced or acknowledged alarm as a substitute for an actual bridge watchkeeper being present and alert

Class survey

BNWAS is a SOLAS V/19 requirement checked at annual and renewal surveys; the surveyor will normally require a live demonstration of the full alarm sequence including the final crew/master alarm stage, so keep test records and any dispensation paperwork on board.

Estimated lifetime: Bridge alarm electronics of this type are typically specified for 10-15+ years of service with normal battery and switch replacement; this is not a mechanical running-hours item

Spares

Replacement Parts

Spare parts notes

Spare parts via Kongsberg Maritime AS or authorised distribution partners. Lead time: 2-6 weeks.

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