D-CRc.11/3,5 02.09.01
The D‑CRc.11/3,5 davit is an IMO‑approved lifeboat/raft launch system featuring configurable hoist capacity and hybrid drive options (electric, hydraulic or manual) with a fast‑rescue speed of up to 48 m/min and optional docking head to suppress pendulum motion.
Inspector Detail
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Common issues
- Wire fall wear or corrosion, particularly at drum and sheave contact points
- Docking head misalignment leaving pendulum motion not fully suppressed
- Electric drive motor or hydraulic pump faults limiting available drive modes
- Brake system drift under load
- Limit switch or overrun protection failures
- Manual back-up drive (handwheel/crank) seized from lack of use
Inspection checklist
- Visual inspection of wire falls, drum, and sheaves
- Test all available drive modes - electric, hydraulic, and manual - in turn
- Check docking head function and alignment against the hull
- Test brake holding and controlled lowering speed
- Test on-load release gear per the maker's procedure
- Check limit switches and overspeed/overrun protection
- Verify emergency stop and local/remote control stations
Service intervals
| Weekly operational test | per SOLAS, davit and boat operated through range where practicable |
| Monthly inspection | visual and functional per the LSA Code |
| Annual thorough examination | per SOLAS III/20 and the LSA Code by a competent person |
| On-load release gear overhaul and load test | every 5 years, per SOLAS III/20.11 |
| Manual back-up drive exercise | at each monthly test, to prevent seizure |
Typical wear limits
| Wire fall | reject per the LSA Code wire rope rejection criteria - condition-based, not a fixed number |
| Brake lining | inspect for glazing and thickness per the maker's manual, no generic figure applies across davit sizes |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Wire fall set
- Brake linings/pads
- Limit switch assemblies
- On-load release gear components
- Hydraulic pump or electric drive motor seal/brush set, as applicable
Safety
- On-load release gear malfunction risk as with all davit systems - strict test procedure adherence required
- Suspended load hazard during any test or maintenance
- Multiple drive modes increase the risk of an un-isolated back-up drive engaging unexpectedly - confirm all drives isolated before working on the mechanism
- Docking head pinch points
Class survey
As an IMO/SOLAS-approved launching appliance, subject to the same SOLAS III/20 and LSA Code inspection, annual thorough examination, and 5-yearly overhaul/load test regime as other lifeboat/raft davits; class specifically checks on-load release gear overhaul records.
Components & Design
Component data being added…
Technical Data
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Common failures & inspection points
Annually: operational test of on-load release gear by positioning the boat partially in water for load support by fall, actuation of release gear, reset and inspection for damage. Every 5 years: overhaul of release system with 110% proof-load test. Inspect release gear before and after operational test; verify hook securing and reset.
Monthly: visual inspection for fraying, kinks, corrosion, broken strands. Annually: wire rope and sheaves for scratches, dents, corrosion, missing lubrication. Every 5 years: wire rope replacement per SOLAS Chapter III required. Lubrication of wires, sheaves and moving parts to be checked.
Annually: brake test by suspension of rated load and verification that brake holds without slippage. For centrifugal brakes: sinking speed against SOLAS formula (max. 1.3 m/s) to be checked. Brake pads to be inspected and replaced when worn. Every 5 years: brake system to be opened and condition thoroughly checked.
Annually: sheaves for wear grooves, wear ring wear, corrosion, incorrect alignment, loose bolts to be checked. A worn or corroded sheave damages new wires and leads to premature wire rope failure. Wear ring thickness to be measured and replaced if necessary. Lubrication to be checked.
Annually: davit structure for corrosion (especially welds), wear, deformation, excessive clearance, cracks to be checked. All bolt locking devices to be verified. Hydraulic cylinders for leakage to be checked. Every 5 years: selective disassembly with NDT (roughness inspection, crack inspection) to be performed. Foundations to be inspected.
Annually: dynamic winch brake test at 110% of Safe Working Load to be performed (simulated by water bag equipment or certified load cells). Every 5 years: comprehensive proof-load test of entire davit, winch, wire rope and hook system at 110% SWL to be performed. System must hold load, show no deformation or damage.
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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