Engine Requirements For Commercial Vessel Survey

If a vessel carries paying passengers, does commercial work, or is hired out with or without a skipper, it is a domestic commercial vessel and it operates under a national regulatory system rather than under recreational rules.

This page explains the shape of what that means for the engine and its installation. It is orientation, not legal advice — the authoritative sources are the National Standard for Commercial Vessels, the Marine Order that applies to your vessel, and the surveyor or accredited person handling your survey.

Who administers it

Domestic commercial vessels in Australia are regulated nationally by the Australian Maritime Safety Authority. Survey work is carried out by accredited marine surveyors, and some functions are delivered through state agencies acting for AMSA.

Your vessel’s obligations depend on its class (what it does — passenger, non-passenger, fishing, hire and drive) and its operational area (how far offshore it works). Both change what is required of the machinery.

What survey looks at on the engine side

A machinery survey is concerned with the installation as a whole, not just the engine block:

Propulsion machinery — condition, security of mounting, guarding of moving parts, condition of the drivetrain and shafting.

Fuel system — tank construction and mounting, shut-off arrangements accessible from outside the space, hose specification and condition, filtration, and containment of leaks.

Exhaust system — cooling arrangement, insulation of hot surfaces, security, and protection against water entering the engine.

Cooling — sea inlets, seacocks, strainers, and the ability to isolate.

Bilge pumping — capacity, independence, and arrangements for the engine space.

Fire safety — fixed or portable protection for the machinery space, remote fuel shut-off, and closing of ventilation.

Electrical — battery security and isolation, wiring standard and protection, and the state of the engine loom.

Steering and controls — condition and any emergency arrangements.

Ventilation — adequate combustion and cooling air for the space.

Documentation — a maintenance record for the machinery is expected, and it is the item most often found wanting.

Where owners get caught out

• Converting a recreational boat to commercial use. The engine may be perfectly sound and the installation still fail — automotive-grade hose, unprotected wiring, no remote fuel shut-off, inadequate guarding.
• No maintenance records. Survey wants evidence of a maintenance system, not just an engine that starts.
• Deferred items caught at renewal. Corroded mixing elbows, perished hoses and tired seacocks are common findings.
• Changing operational area or class. Requirements step up; what passed before may not now.
• A repower without checking. Fitting a different engine changes the installation, and the installation is what is surveyed.

Practical advice

Talk to a surveyor before buying a boat you intend to put into survey, and before a repower. The cost of that conversation is trivial against the cost of discovering the arrangement is not acceptable after the money is spent.

Keep a maintenance log from day one. It is required in substance, it makes renewal survey faster, and it is worth real money when you sell.

Frequently asked questions

Do I need survey for a charter boat in Australia? A vessel used for hire or reward is generally a domestic commercial vessel and subject to the national system. Check your specific operation with AMSA or an accredited surveyor.

Who regulates commercial vessels in Australia? AMSA administers the national system for domestic commercial vessels, with survey performed by accredited marine surveyors.

Can I use a recreational engine in a commercial vessel? Engines are usually rated by the manufacturer for a duty cycle — recreational, light commercial, continuous. Using an engine outside its rating affects both compliance and warranty.

What engine records does survey want? A maintenance system with dated records of servicing and repairs to the propulsion machinery and its associated systems.

Does a repower need to be approved? Changing the propulsion machinery changes the surveyed installation. Speak to your surveyor before committing to the work.