The slides, written out
AI-drawn illustration. Simplified to explain the idea, not to scale.
Slide 1 · RO-RO
RO-RO
SHELL DOOR
SAFETY SYSTEMS
Bridge Monitoring, CCTV &
SOLAS Compliance
BRIDGE
MONITORING
CCTV
SURVEILLANCE
WATER LEAKAGE
DETECTION
SOLAS
COMPLIANCE
SOLAS
Chapter II-1
Regulation 17-1
UK MCA
Implementation
Guidance: MSN 1907(M)
Slide 2 · RO-RO SHELL DOOR SAFETY SYSTEMS
RO-RO SHELL DOOR SAFETY SYSTEMS
WHY THESE SYSTEMS
EXIST
Lessons From Historic
Maritime Casualties
THE RISK:
Progressive Flooding
Through Unsecured
or Damaged Shell Doors
HERALD OF
FREE ENTERPRISE
6 MARCH 1987
The bow doors were left
open. Water entered
the vehicle deck leading
to progressive flooding
and loss of 193 lives.
ESTONIA
28 SEPTEMBER 1994
Defective bow visor
allowed water ingress
through the bow doors
resulting in catastrophic
flooding and loss of
852 lives.
Unsecured or leaking
shell doors can lead to
RAPID, UNCONTROLLED
FLOODING.
SOLAS
THE SOLAS RESPONSE
These tragedies drove significant amendments to
SOLAS CHAPTER II-1, REGULATION 17-1
setting mandatory requirements for door indication,
monitoring, alarms and operational procedures on
Ro-Ro passenger ships.
SOLAS
Shell door monitoring is treated as a
CRITICAL SAFETY SYSTEM
— not just a convenience.
Slide 3 · RO-RO SHELL DOOR SAFETY SYSTEMS
RO-RO SHELL DOOR SAFETY SYSTEMS
BRIDGE MONITORING
SYSTEMS
Continuous Monitoring. Instant Alerts. Maximum Safety.
1
BRIDGE INDICATOR PANEL
(MIMIC PANEL)
Fail-safe monitoring of all critical
shell doors and securing arrangements.
SHELL DOOR MONITORING SYSTEM
PORT SIDE
DOORS
BOW
DOOR
STERN
RAMP
STBD SIDE
DOORS
GREEN
Door closed and
securing arrangements
properly engaged.
RED
Door open or securing
arrangements not
fully made up.
MODE:
SEA VOYAGE MODE
AUDIBLE & VISUAL ALARM
Alarm activates on any change
of state or loss of securing
while at sea.
2
HARBOUR / SEA VOYAGE MODE
Many modern systems incorporate harbour/sea
voyage mode logic to prevent departure with
unsecured shell doors.
MODE SELECTOR
HARBOUR
SEA
VOYAGE
3
CCTV SURVEILLANCE
CCTV cameras monitor door
seals and surrounding areas.
Live feed to
BRIDGE
ENGINE CONTROL
ROOM (ECR)
4
WATER LEAKAGE
DETECTION
Sensors detect water ingress
in void spaces.
Alarms on bridge and ECR.
Immediate investigation
and response as per SMS.
5
INDEPENDENT
POWER SUPPLY
Indicator & alarm systems have
power supply independent from
door operating/ superviosing systems.
MAIN POWER
(DOOR OPERATING
SYSTEM)
INDEPENDENT POWER
(MONITORING &
ALARM SYSTEM)
COMPLIANCE FRAMEWORK
SOLAS
Chapter II-1
Regulation 17-1
UK MCA
Implementation Guidance
MSN 1907(M)
Fail-safe systems
Continuous monitoring
Visual & audible alarms
CCTV & leakage detection
Operational procedures under SMS
Slide 4 · RO-RO SHELL DOOR SAFETY SYSTEMS
RO-RO SHELL DOOR SAFETY SYSTEMS
OPERATIONAL PROCEDURES
& SMS COMPLIANCE
Technology + Procedures = Ro-Ro Safety
THE HUMAN ELEMENT
Closed-Loop Verification
Before Departure
REGULATORY REQUIREMENTS
SOLAS II-1 Regulation 17-1
UK Implementation Guidance: MSN 1907(M)
ISM Code – Operational Responsibility
Class & Flag Administration Requirements
THE OPERATIONAL SEQUENCE
1
2
3
4
5
CLOSE & SECURE SHELL DOORS
Bosun closes and secures all shell doors in accordance with the approved procedure.
VERIFY ON CCTV
OOW monitors CCTV feeds on Bridge and confirms doors are properly closed and seals in contact.
CONFIRM BRIDGE INDICATION
OOW verifies on the mimic panel that all doors show green (closed and securing arrangements made).
MAKE LOGBOOK ENTRY
Record the time of last closing of all shell doors and ramps before departure.
SWITCH TO SEA VOYAGE MODE
Ensure the system is set to Sea Voyage Mode before the vessel proceeds from the berth.
LEAKAGE ALARMS
Any water leakage alarm requires immediate investigation and response in accordance with the Safety Management System.
DOCUMENTATION & PROCEDURES
DOCUMENTED PROCEDURES
Approved operating procedures for each shell door must be available and followed.
SUPERVISION & REPORTING
Bosun reports closure to OOW. OOW verifies, confirms and logs.
LOGBOOK RECORDING
Mandatory entry of last closing time before departure.
SAFETY MANAGEMENT SYSTEM (SMS)
All operations conducted under the vessel's SMS with clear responsibilities and emergency actions.
Every closed door is a barrier.
Every check protects lives.
Drafted by SailR from our daily lessons. AI-drawn illustration. Simplified to explain the idea, not to scale. Last updated 19 Oct 2026.
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