Offshore wind crew transfer: what companies need to prepare

Vessel transfer is the default offshore, and it works until sea state, distance or a maintenance backlog makes it unworkable. A helicopter converts a lost day into a worked day, at a cost that has to be justified against downtime.

Most requests that stall do so on paperwork, not aviation: uncertain hoist approval, technicians whose certificates expired, or a wind-farm operator who was never asked.

• Sea state or swell is blocking vessel transfer while turbines remain unavailable.
• The wind farm is far enough offshore that vessel transit consumes most of the shift.
• A fault is reducing generation and technicians must reach the turbine quickly.
• A maintenance campaign must recover time inside a defined window.
• Where vessels can sail and the schedule has slack, vessel transfer usually remains the economical choice.

• Access method per asset: certified helideck, prepared onshore pad, or turbine hoist-only.
• Certification status for every technician: offshore survival, hoist familiarisation and medical validity.
• Crew size per lift and per day, with dressed weights including survival suits.
• Equipment and tooling weights, separately from personnel.
• Realistic sector time from the intended onshore base, and the usable daylight window.
• Expected weather-loss days across the campaign, and the contingency plan.
• Wind-farm operator approval route, site induction requirements and the on-site point of contact.

• Turbine access is normally hoist-only, which is a specialist approval held by a limited number of operators.
• Hoist operations are counted in cycles inside a window, not in flights; the window, not the aircraft, usually sets the limit.
• Wind, visibility and icing limits are operator and aircraft specific, and the operator's judgement on the day is final.
• Certificates must be current and verifiable; an expired certificate stops a mission as effectively as bad weather.
• Standby or positioned cover is a contract arrangement, planned in advance with the operator.

• Access method: deck, pad or hoist-only.
• Certification status for every person on the manifest.
• Crew and equipment weights per lift.
• Sector time and usable daylight window.
• Weather-loss allowance across the campaign.
• Wind-farm operator approval and induction requirements.
• Standby or medevac expectations.

• Offshore & industrial readiness checker
• Offshore wind maintenance window calculator
• Vessel transfer calculator