ISO 9927-3:2019

Overview - ISO 9927-3:2019 (Cranes - Inspections - Part 3: Tower cranes)

ISO 9927-3:2019 specifies the regular inspection regime for tower cranes to ensure safe operation and detect deviations from safe working conditions. It covers the types of inspections, their content, minimum periodicity, reporting and required records. The document does not cover inspection prior to first use and is intended to be used alongside ISO 9927‑1. Manufacturer instructions that differ from ISO 9927‑3 remain applicable.

Key topics and requirements

• Types of inspections:
  • Daily inspections - visual checks and basic functional tests (brakes, limit/indicator devices, visible defects/ropes) performed before startup by a competent person (typically the operator).
  • Frequent inspections - items like lubricant levels, hydraulic leaks, hooks, wire ropes (see ISO 4309), connections, brake wear, hoses, electrical installation and anchorage. Minimum frequency: items (a–e) monthly; items (f–i) twice yearly, adjusted for actual use and environment.
  • Periodic inspections - performed at least annually and after re-erection; include frequent inspection items plus functional tests (with and without rated load) in the most unfavourable positions, structure checks (welding, corrosion, deformation, cracks), and review of identification, handbook and maintenance records.
  • Thorough inspections - detailed examinations by an expert-level competent person; can require nondestructive testing and dismantling when justified. Periodicity considers usage data and may differ if automatic data recording is available.
  • Exceptional inspections - triggered by specific events (outlined in Clause 9).
• Competence and records: inspections must be done by appropriately competent people (operator, experienced technician, expert engineer per ISO 9927‑1). Reports - operator’s log, maintenance and inspection record books - must be updated and retained.
• Reporting: Periodic and thorough inspections require documented reports listing components inspected and remaining defects; examples and report templates are provided in the standard’s annexes.

Applications - who uses this standard

• Crane operators and site supervisors for daily and frequent checks.
• Maintenance technicians and service providers performing periodic servicing and functional load tests.
• Inspection engineers and safety managers conducting thorough inspections and non‑destructive testing.
• Compliance officers, equipment owners and rental companies using inspection reports for asset management and regulatory compliance.

Practical benefits

• Improves safety through structured, repeatable inspection procedures.
• Supports preventive maintenance and early detection of wear (hooks, wire ropes, brakes, structure, hydraulics, electrical).
• Provides consistent documentation for audit, liability and lifecycle management.

Related standards

• ISO 9927-1 - General principles and competence criteria for crane inspections.
• ISO 4309 - Wire ropes - care, maintenance, inspection and discard.

Keywords: ISO 9927-3:2019, tower cranes inspections, periodic inspections, daily inspections, thorough inspections, crane maintenance, ISO 9927, ISO 4309.