HRN.28LT
The Global Davit GmbH HRN.28LT is a deck‑mounted davit system for launching and recovering lifeboats or rescue rafts, featuring a high load capacity and compliance with IMO SOLAS requirements.
Inspector Detail
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Common issues
- Wire rope corrosion, broken wires or birdcaging on the falls
- Winch brake lining wear reducing holding capacity
- Grease starvation at sheaves and pivot points increasing operating friction
- Limit switch / end-of-travel switch drift causing overrun
- Hydraulic cylinder seal leakage on hydraulic davit arms
- Structural corrosion at the davit foot/pivot pin area exposed to weather
- Remote or local control station wiring and push-button faults
Inspection checklist
- Visual inspection of wire falls for broken wires, corrosion, kinks
- Winch brake holding test against rated load per LSA Code requirement
- Function test raising/lowering at full speed and creep speed
- Check limit switches and interlocks operate correctly
- Inspect hydraulic hoses/cylinders for leaks (hydraulic type)
- Check pivot pins, bushings and greasing points
- Inspect structural welds and foundation bolts for corrosion or cracking
- Confirm on-load release gear (if fitted) operates and resets correctly
Service intervals
| Visual/operational check | monthly (SOLAS drill requirement) |
| Winch brake load test | annually |
| Wire fall renewal | typically every 5 years or per maker's manual/condition |
| Full davit overhaul incl. dynamic winch test | every 5 years (LSA Code periodic servicing) |
| On-load release gear operational test | every 5 years, with 1-year interim thorough examination |
Typical wear limits
| Wire rope broken wires | condemn per an applicable wire rope discard standard (e.g. ISO 4309) - no fixed percentage without inspection |
| Brake lining thickness | renew before reaching the maker's stated minimum thickness |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
Critical spares
- Wire rope falls (matched set)
- Winch brake linings
- Limit switch assembly
- Hydraulic cylinder seal kit (if hydraulic)
- Sheave bearings
Safety
- Suspended load hazard during lowering/raising - keep personnel clear of the fall of the wire
- Stored hydraulic pressure in cylinders - isolate before maintenance
- Brake failure risk if linings are worn beyond limits - do not load-test until verified
- Working aloft/at height on the davit structure
Class survey
LSA Code requires annual thorough examination and load test of the winch brake, plus 5-yearly overhaul including a dynamic winch test to 1.1x SWL and static structural test to 2.2x SWL (or per maker's approved schedule). Records of these tests are checked at Annual and Renewal Survey.
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
Verified against the DNV Approval Finder — the certificate below is issued by DNV, not by us.
- Certificate
- MEDB0000C0W
- Approved as
- Release mechanism for: - lifeboats and rescue boats (launched by a fall or falls)
- Certificate holder
- Global Davit GmbH (Germany)
- Valid until
- 2031-01-26