Understanding the 10-Year Major Inspection for EWPs (and Why 5 Years Matters)

What a major inspection actually is

A major inspection is a systematic teardown and re-assessment carried out to confirm that a machine remains structurally sound and safe to operate for a further defined period. It is distinct from routine servicing (lubrication, filter changes, adjustment) and from the annual or periodic inspection, which is largely a functional and visual check. The major inspection goes deeper because time, fatigue cycling and corrosion accumulate in ways that surface inspection cannot detect.

In Australia the requirement flows from AS 2550.10, the safe-use standard for elevating work platforms, read together with the design standard AS 1418.10. AS 2550.10 establishes that an EWP must receive a major inspection at intervals not exceeding ten years from the date of manufacture, and thereafter at intervals determined by a competent person. The scope is intended to return the machine to a known, documented condition rather than simply to confirm it still starts and elevates.

Where the ten-year rule comes from

The ten-year major inspection interval is written into AS 2550.10. It applies from the date the machine was manufactured, not from when it was purchased or first commissioned, which frequently surprises buyers of near-new second-hand units. A platform built in 2016 and bought in 2021 is still due for its major inspection in 2026.

After the first major inspection, subsequent intervals are set by a competent person on the basis of the machine's condition, duty and operating environment. A lightly used platform in a clean warehouse may be signed off for a further period at or near the maximum, whereas a heavily cycled unit working in a coastal or mining environment may be given a shorter interval. The interval is a professional engineering judgement, not an automatic reset to another ten years.

Why some owners inspect at five years

While AS 2550.10 sets the outer limit at ten years, a large number of duty holders adopt a five-year interim inspection regime. There are several sound reasons for this. Manufacturers of many boom and scissor platforms specify intermediate structural inspections in their maintenance manuals, and under WHS legislation the manufacturer's instructions form part of the duty to maintain plant. Ignoring them is difficult to defend if an incident occurs.

Fleet operators and hire companies also use the five-year point commercially. A documented interim structural inspection reassures clients, supports higher residual values at resale, and catches fatigue cracking or corrosion early, when repairs are cheaper. For insulated EWPs used on live electrical work the interim examination is effectively mandatory, because the dielectric integrity of the boom cannot be assumed across a full decade.

• Manufacturer maintenance manuals frequently specify a mid-life structural inspection
• WHS duties require plant to be maintained in accordance with manufacturer instructions
• Early detection of fatigue and corrosion lowers lifetime repair costs
• Interim certification supports resale value and client due diligence

What the inspector strips and examines

A major inspection begins with a thorough clean and, where practicable, degreasing so that the structure can be seen. Booms are extended and, on many machines, pins are driven out so that pivot bores, bushes and pin surfaces can be measured and examined. Covers, guards and non-structural fairings are removed to expose welds. The machine is effectively broken down to the point where the load-bearing structure is accessible.

The examination targets the components that carry load and the joints that fail under fatigue: chassis members, turntable and slew bearing, boom weldments, cylinder mountings, pins and their retaining arrangements, and the platform mounting. Wear is measured against manufacturer tolerances, corrosion is mapped and assessed for section loss, and any prior repair is checked against a recognised procedure.

The role of non-destructive testing

Non-destructive testing (NDT) is central to a credible major inspection because most structural failures begin as cracks that are invisible to the eye. Magnetic particle inspection is the workhorse for ferromagnetic welds and machined surfaces, revealing surface and near-surface cracking at boom butt welds, pin bores and cylinder eyes. Dye penetrant testing is used on non-ferrous components and on ground weld caps.

Ultrasonic testing is applied where thickness must be verified through corrosion or where sub-surface flaws are suspected, and eddy current testing is useful for bolt holes and coated surfaces where paint cannot be removed. The specific method mix is chosen by the inspecting engineer for each critical location. All NDT should be carried out by personnel certified to AS 3998 or an equivalent scheme, and the results form part of the permanent record.

Load, function and electrical testing

Once the structure has been re-assembled and verified, the machine is re-commissioned and tested as a system. Functional testing confirms that every control, interlock, emergency lowering device and overload sensor operates correctly. A proof or rated load test verifies structural and hydraulic capacity and confirms that the platform holds load without creep.

For insulated units a dielectric test confirms the electrical integrity of the boom and, where fitted, the liner and upper controls. All electrical protective devices, RCDs and bonding are verified. Only when the machine passes the full test sequence is it recertified.

Documentation, plates and the outcome

A major inspection is only as good as the record it produces. The output is an engineering report that identifies the machine, lists every component examined, records measurements and NDT results, notes repairs carried out, and states the competent person's determination of the next inspection interval. Compliance and inspection plates are updated, and the log book is endorsed.

Where defects cannot be economically rectified, the report may recommend that the machine be withdrawn from service. This is not a failure of the process; it is the process working. A documented, defensible decision to retire an unsafe platform protects the duty holder far more than an optimistic sign-off ever could.

Planning around downtime

A major inspection typically takes a boom or scissor platform out of service for several days to over a week, depending on machine size, condition and whether NDT reveals defects that require repair. Sensible owners schedule the work in a quieter period, confirm parts availability for likely wear items in advance, and book the inspection well before the due date so that a machine is never operated past its interval.

Operating an EWP beyond its major inspection due date exposes the duty holder to prosecution and voids most insurance. The cost of planned downtime is trivial compared with the cost of an uninsured incident on an uncertified machine.