FICA: Consultation on yarder tower modification guidelines [NZ]
Friday 16 Oct 2026
When a cable yarder has been operating for 20, 30 or even 40
years, modifications are inevitable. Engines are repowered,
control systems upgraded, brakes replaced, hydraulics improved and,
occasionally, structural changes are made.
The question is not whether modifications will occur, but how we ensure
they are undertaken safely, consistently and with appropriate oversight.
That issue was one of the key topics discussed at the recent Forestry
Tower Inspectors Workshop, attended by almost every active tower
inspector in New Zealand. Workshop participants identified a need for
greater clarity in the Engineering Safety Inspections of Cable Log
Yarders Best Practice Guidelines regarding what modifications require
Chartered Professional Engineer (CPEng) certification and what work can
appropriately be carried out by other suitably competent specialists.
Following the workshop, FICA has worked with inspectors and industry
stakeholders to develop a proposed amendment to the Best Practice Guide.
What is being proposed?
The proposed changes clarify that:
- Major structural modifications to a yarder tower, tower mounting
points or other load-bearing structures would require assessment and
certification by a suitably experienced CPEng.
- Examples include structural alterations, changes to tower mounts and
the addition of sheaves that could affect load paths.
- Routine upgrades or replacements of engines, transmissions, torque
converters, clutches, brakes, hydraulic systems and operating or control
systems would not automatically require structural certification,
provided the work is carried out by a suitably competent person.
- A clearer definition of "suitably competent person" would be added,
together with practical examples of the types of people qualified to
undertake different forms of modification work.
A corresponding amendment is also proposed for modifications to OEM
control systems, including joystick conversions and software
modifications.
More >>
Source & image credit: Forest Industry Contractors Association
(FICA)
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