Published September 23, 2026 · EasyStagecraft

Fly System Inspection: What a School or Council Theatre Must Check, and How Often

A fly system inspection is a structured, documented examination of every load-bearing component in your counterweight or hemp flying system — carried out at defined intervals by people with the competence to know what failure looks like. In an Australian school or council theatre, you are legally required under state WHS legislation to ensure plant is safe before use, and "we haven't had any problems" is not a defence if an inspector asks when the system was last formally checked. This article sets out exactly what to examine, how often, and what paperwork you must be able to produce.

Why Fly System Inspection Is a WHS Obligation, Not Optional Best Practice

Under the Work Health and Safety Act 2011 (and its state equivalents in Victoria, WA, SA and Queensland), a flying system is plant. The person conducting a business or undertaking (PCBU) — your school, council, or venue operator — must manage risks associated with that plant across its entire lifecycle. Safe Work Australia's Code of Practice: Managing the Risks of Plant in the Workplace requires documented inspection and maintenance records for any item of plant that can injure people if it fails. A counterweight flying system, where a steel arbor loaded with cast iron weights sits above an operating crew member's head, absolutely qualifies.

If something goes wrong and WorkSafe, SafeWork NSW, WorkSafe QLD or your state regulator investigates, the first question is: "Show me your inspection records." If you cannot, the presumption shifts firmly toward negligence. For related documentation obligations across your whole venue, see our performing arts centre safety audit guide.

Three Inspection Tiers: Daily, Periodic, and Annual

Fly system inspection does not mean one big annual event. It operates across three tiers, each with different scope and required competency.

Tier 1 — Daily Pre-Use Check (Operational Staff)

Before any flying line is moved during a rehearsal, bump-in or performance, a trained crew member must walk the system and confirm the following:

• Line locks and brake locks engage positively and release cleanly — no stickiness, no slop.
• Purchase lines (hand lines) are free of fraying, knots, or splices not present in the original installation.
• Arbors are loaded symmetrically, weight keepers (retaining pins or bars) are in place, and no weights are cracked or chipped.
• Batten trim marks on the purchase line correspond to the trim height recorded for each bar — a shift means something has moved unexpectedly.
• Nothing is resting on or fouling a batten that shouldn't be, and no lines are twisted or riding over each other.
• The loading gallery is clear of loose items, tools, and unauthorised personnel.
• No audible grinding, squealing, or irregular resistance when a line is walked manually through a short travel.

This check takes 10–15 minutes for a standard school fly tower of 8–16 lines. Log it in a physical or digital ops log: date, time, who checked, any anomaly noted and action taken. Undated or unsigned logs are worthless to a regulator.

Tier 2 — Periodic Inspection (Competent Person, Every 3–6 Months)

A competent person — typically a venue's head of technical, a qualified rigger (RB or EN class), or an engaged theatre consultant — conducts a deeper inspection at least every six months for a lightly used school venue, and every three months if the system is in frequent production use. This covers everything in Tier 1 plus:

• Wire rope lift lines: inspect for broken wires, kinks, bird-caging, corrosion, and diameter reduction along the full visible length. Industry guidance (AS 3569 Steel Wire Ropes) recommends discard at 10 or more randomly distributed broken wires in any rope lay length of eight diameters.
• Head block and loft block sheaves: check for wear grooves, cracked flanges, bearing play, and correct rope seating.
• Arbor guides and T-bar tracks: look for bending, corrosion, missing bolts, and smooth travel of the arbor through its full range.
• Counterweight integrity: reject any weight with visible cracks, spalling, or modification.
• Batten condition: check for straight alignment, secure end stops, and integrity of all clamp attachment points.
• Rope locks: disassemble and inspect cam wear at least annually; at periodic inspection, test clamping force and inspect for visible wear.
• Any motorised hoists on the same grid: verify limit switches and load cell readings against manufacturer specification.

Write a dated, signed inspection report. Note pass/fail against each item. Anomalies must generate a work order — "noted for later" is not a control measure.

Tier 3 — Annual Competent-Person Inspection (Full Engineering Assessment)

Once per year, an independent qualified rigger or structural/mechanical engineer with demonstrated theatre rigging experience must conduct a comprehensive assessment. This goes beyond observation:

• Wire rope replacement assessment with load calculations relative to the system's Safe Working Load (SWL) signage — confirm SWL labelling is still accurate and visible.
• Head block and grid structure inspection, including any accessible steelwork connections.
• Torque check on all accessible fasteners in the grid and block mounting points.
• Full travel test of every line under controlled conditions, observing block alignment and rope tracking.
• Review of the previous 12 months' Tier 1 and Tier 2 logs to identify patterns (recurring stiff locks on a particular line, for example, suggest a tracking or sheave problem).
• Written report with a clear statement of fitness for continued use, any items requiring immediate attention, and recommended remediation timeline.

If your venue has never had a Tier 3 inspection, or cannot locate the last one, stop using the system for anything other than static hanging until that inspection is completed. This is not overcaution — it is your WHS duty of care.

Documentation: The Four Records an Inspector Will Ask For

Keeping these records in a plant register — a single location that logs each piece of plant with its inspection history — is both best practice and increasingly expected by auditors. EasyStagecraft's EasyRisk plant register is purpose-built for performing arts venues and keeps all four record types linked to each asset, so "when was it last checked" always has a traceable, dated answer.

Your fly system's SWMS should cross-reference this inspection schedule. If you need a starting point for rigging paperwork, our SWMS template for theatre rigging and working at height covers the safe work method statement requirements for Australian school and council venues.

Loading Gallery Discipline: The Overlooked Risk

Most fly system incidents in school theatres don't involve a catastrophic line failure — they involve dropped counterweights from a poorly managed loading gallery. Establish and enforce these non-negotiable rules:

• Only the operator loading or unloading weights is permitted on the gallery during that operation. No observers, no students "just watching."
• All weights must be staged horizontally in a dedicated rack, never stood on edge or stacked on the gallery rail.
• The zone below an arbor being loaded must be cleared and, where possible, barriered.
• No weight leaves the rack unless the corresponding batten is chocked at deck level.
• Gallery access requires a formal induction. Attach this requirement to your crew induction checklist so no casual or volunteer crew member accesses the gallery without documented sign-off.

When to Take a Line Out of Service Immediately

Any of the following findings during any tier of inspection requires immediate withdrawal of that line from use and a tagged lock-out until assessed by a competent person:

• A rope lock that will not hold a loaded batten at trim
• Wire rope with visible kinking, bird-caging, or more than a handful of broken wires in any inspection section
• An arbor that does not travel smoothly through its full range under hand tension
• Any head block or loft block with a cracked flange or audible bearing failure
• Evidence of unauthorised modification to a weight, line, or anchor point

Tag the line out physically — a physical lock and a written tag are both required — and document the finding in the maintenance log the same day. Do not rely on verbal communication that "Line 7 is out." It must be written, signed, and attached to the hardware.

Getting Your Inspection Programme Started

If your venue has no current inspection programme, begin here:

1. Commission an immediate Tier 3 inspection to establish baseline condition and confirm SWL.
2. Create a daily pre-use checklist tailored to your specific system (lines, locks, arbor count) and train all operational crew on it.
3. Schedule Tier 2 inspections in your production calendar — treat them as fixed events, not something to fit in when convenient. They belong in your production schedule alongside bump-in and rehearsal dates.
4. Build your plant register before your next production season, not after an incident.

A fly system is one of the highest-consequence items in any performing arts venue. The inspection cadence described here is not excessive — it reflects what any regulator, insurer, or court would consider the minimum reasonable standard of care for plant that operates above people's heads.