Rhs.L.21/3,6 04E.04
The Global Davit GmbH Rhs.L.21/3,6 04E.04 is a motor‑driven lifeboat/raft davit system designed for rapid and safe launch of SOLAS‑approved lifesaving appliances.
Inspector Detail
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Common issues
- Wire fall corrosion or broken wires reducing the safety margin below the required working load
- Winch brake slipping or overheating during lowering
- Limit switch misalignment allowing davit arm overtravel
- Hydraulic power pack leaks on hydraulic davits, or track/roller seizure from corrosion and lack of lubrication on gravity davits
- Remote/local control station wiring faults
- Falls wire spooling incorrectly or crossing on the drum
- Gripes and securing lashings seized by paint or corrosion
Inspection checklist
- Visual inspection of wire falls for broken wires, corrosion and kinks per the LSA Code
- Function-test the winch brake holding load (dynamic brake test) per statutory requirement
- Check limit switches and emergency stop function
- Inspect davit arm pivot pins, bushes and structural welds for cracks or wear
- Check hydraulic hoses/cylinders for leaks on hydraulic davits
- Confirm gripes, harbor pins and securing arrangements release freely
- Check davit track/rollers for corrosion and free movement
- Verify local and remote lowering controls and communication with the boat
Service intervals
| Winch brake load/proof test | annually, per SOLAS/LSA Code |
| Wire falls | renewed per manufacturer's recommended interval, typically not exceeding 5 years or sooner on condition |
| Davit annual thorough examination | annually (SOLAS III/20) |
| Winch and davit structure overhaul | every 5 years |
| Lubrication of falls, sheaves and pivot pins | monthly or per the planned maintenance system |
Typical wear limits
| Wire fall broken wires | renewal criterion per the LSA Code and the applicable wire rope standard rather than a single fixed number - confirm against the davit manual |
| Winch brake lining thickness | renewed when approaching the manufacturer's stated minimum - check at each annual survey |
| Winch gearbox oil condition | changed per the maker's interval or when visibly contaminated - inspected at the annual overhaul, no universal figure applies |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Wire fall matching the original diameter and construction (ordered by length/specification, not a part number)
- Winch brake linings/pads
- Limit switch assembly
- Hydraulic cylinder seal kit for hydraulic davits
- Sheave bearings
Safety
- Falling-load hazard during launch/recovery if the brake fails - no one works under a suspended boat without a secure backup arrangement
- Crush hazard at davit arm pivot points
- Stored hydraulic pressure - isolate and depressurize before maintenance
- Wire rope under tension can snap back if damaged - inspect before loading
Class survey
Davits fall under the LSA annual thorough examination and 5-year overhaul regime (SOLAS III/20, MSC.1/Circ.1206 as amended). Class/flag will check winch brake test records, wire fall condition reports and davit structural examination documentation.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Annual functional test at 1.1 × SWL; after test check locking; inspect for dried paint/contamination/corrosion in lock, thread/shank wear/cracks. 5-year dynamic test. SOLAS III / MSC.402(96).
Inspect for kinks, corrosion, strand breakage (>10% over 8d length = replacement), inaccessible sections; correct/certified ropes; if required turn for full inspection; renewal per manufacturer interval.
Brake pad wear; check lowering speed (SOLAS S=0.4+0.02H, max ~36 m/min); remote release function; brake not blocked by poor maintenance.
Galvanized structure + stainless steel fasteners for pitting/discoloration; NDT of load-bearing structure for cracks; incident RRS Sir David Attenborough 2021 (severe corrosion due to poor maintenance).
Planned maintenance complete since installation? Annual + 5-year tests recorded in logbook; manufacturer instructions followed; only authorized personnel (MSC.1/Circ.1205 Rev.1).
Type-general inspection and maintenance points for this equipment category — not model-specific.
Service & Maintenance
Engine test weekly (min. 5 min). Release hook maintenance annually by approved service (SOLAS MSC.402(96)). GRP hull inspection at docking. 5-year basic survey.
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DNV type approval
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- Certificate
- 2673705 Lux