Aerial Arts Apparatus & Rigging Monthly Safety Inspection

ContextEach carabiner gate should snap closed positively and the locking sleeve (if present) should engage without force. Open the gate fully and release — it must spring closed within a half-second and sit flush with no gap. Check the spine (the long straight side) for nicks, gouges deeper than 1 mm, or any visible bend — even a slight curve in the spine indicates the carabiner has been shock loaded and its rated capacity is void. Also check the gate hinge pin for corrosion; a stiff hinge is an early warning of internal corrosion. Any carabiner that fails this test is retired immediately — do not tape over damage or continue using it for low-load applications.

ContextSwivels prevent dangerous torquing of aerial fabric and allow certain apparatus to spin freely. Grasp each end of the swivel and rotate — the bearing should turn smoothly with minimal resistance and zero wobble. Side-play (lateral wobble) greater than 2 mm indicates worn or damaged bearings and the swivel should be retired. On threaded-body swivels, check that the locking collar is fully engaged and the threads show no cross-threading or stripping. Swivels should be rated for at least 10 kN (approximately 2,248 lbs) for single-point aerial work; verify this rating is stamped on the body or available in the product documentation.

ContextShackle pins must be fully screwed in and the mousing wire (safety wire) intact. Mouse wire prevents the pin from unscrewing under load-cycling vibration — a shackle with missing mouse wire is unsafe for overhead lifting regardless of how tight the pin feels. Inspect the bow (curved part) for any elongation or flattening; a deformed shackle bow indicates it has been overloaded and must be retired even if it held. Replace mousing wire with 0.8–1 mm stainless steel wire; cable ties are not an acceptable substitute as they degrade from UV and can be sheared by load movement.

ContextQuick links are only at full rated capacity when the sleeve is fully closed and flush. A quick link that is even one thread open can be 25–50% weaker than its stated rating. Use a wrench to confirm full closure — the sleeve should not spin freely when correctly tightened. Check the sleeve thread for galling (metallic tearing from past over-torquing), and inspect the body for any cracking at the sleeve-to-body junction, which is the highest stress concentration point.

ContextIf your studio uses a safety line or instructor-operated belay during student training, the belay device takes intermittent but intense load. Check the slots and edges for groove wear — a groove deeper than 1 mm worn by rope friction indicates the device should be replaced (typically under $40). Check any integral carabiner or attachment hole for deformation. Confirm the device is appropriate for the rope diameter in use; using an 8 mm device with 11 mm rope can cause uncontrolled slippage during a catch.

ContextLay the silk flat or run it slowly through both hands, inch by inch, along the entire length. You are feeling for a sudden reduction in thickness (indicating a thin spot from UV degradation or abrasion), a cut or snag, or a stiff or crusty patch, which is often a burn from friction at the knot point of repeated drops. Thin spots are frequently invisible in dim studio light but catch the eye when the fabric is held up to a bright light — thin areas glow distinctly brighter. Any cut longer than 5 mm or any burn mark anywhere on the fabric is grounds for immediate retirement from load-bearing use.

ContextThe header is the single highest-stress point on aerial fabric — it supports the entire dynamic load every time the apparatus is loaded. Check each stitch row under good lighting and with a magnifying glass if needed. Even a few broken threads in the bartack (the dense, interlocking stitch pattern at the header) constitute a partial structural failure. A header that appears puckered, stretched out of shape, or where the fabric weave is distorting under the stitching should be removed from service. A new header installation by a certified rigger-seamstress typically costs $50–$100 and is worthwhile if the fabric body is otherwise sound.

ContextAerial fabric absorbs sweat, body oils, and environmental moisture. Mold appears as dark speckling, often with a musty smell, and structurally weakens synthetic fibers — a fabric with visible mold should be washed per manufacturer instructions, then re-inspected; if staining persists after washing, retire it. Bleach or chlorine contamination causes immediate and invisible fiber degradation in nylon — a bleached area may appear slightly lighter or have a waxy surface and will fail without warning under load. Never use bleach or hydrogen peroxide on any aerial fabric regardless of the source of contamination.

ContextRun your hands around the entire inner and outer surface of the hoop, feeling for any flat spot indicating an impact deformation, any crack, or any raised ridge at a weld point. Cracks typically appear first at the top tab weld or at the join point of the hoop body — these are the highest-stress areas. Use a strong flashlight at a raking angle along the metal surface to make surface cracks visible against the shadow they cast. A crack of any length in a lyra is cause for immediate retirement — steel cracks propagate rapidly under cyclic loading and a lyra failure at height is catastrophic.

ContextSingle-point lyras have one tab; double-point lyras have two. Each tab receives concentrated force on drops and sudden weight shifts. The tab should be perfectly straight — any bend, even subtle, indicates a past overload event and the lyra must be retired. Check the rigging hole in the tab for elongation (the hole becoming oval rather than round) or cracking at its inner corners. Threaded tabs must have clean, undamaged threads; stripped or galled threads prevent the rigging bolt from achieving proper torque and will allow it to back out under load vibration.

ContextUse a correctly sized wrench to confirm these bolts are torqued to specification. Any bolt that moves before reaching specification torque should be investigated — either the tab threads are worn or the bolt has stretched. Never apply Loctite threadlocker to lyra rigging bolts without consulting the manufacturer; certain adhesive compounds can cause hydrogen embrittlement in high-strength steel alloys, making the bolt brittle under sustained load.

ContextPeeling or bunched grip tape creates uneven grip and can cause sudden hand slippage during dynamic moves. Replace grip tape that has more than 10% delamination from the metal surface — partial delamination bunches suddenly under grip pressure. Check for any exposed raw metal edges from chips or dings that could cut skin during fast transitions; these should be filed smooth and re-taped. Inspect any areas where sweat has accumulated under tape edges — this is where corrosion begins on mild steel lyras.

ContextSuspend the rope and run your hands along the full length with moderate grip pressure. A soft or mushy spot under the sheath indicates broken core fibers — this is invisible from outside but can be felt as the rope giving slightly under squeeze. The sheath (outer braid) should be uniformly tight; any loosening, bulging, or spiraling of the sheath pattern indicates core damage underneath. Heat damage from friction appears as glazed, stiff, or discolored sheath fibers, most commonly near fixed knot points where the rope sees repeated bending under load.

ContextAerial rope knots must be tightly dressed — all strands parallel, no twists, no legs crossing incorrectly. Pay particular attention to the entry and exit points of any fixed knot; this is where the rope experiences the highest bending stress and wears fastest due to repeated loading and unloading. A well-maintained knot should be fully untied and re-tied no less than every six months to redistribute wear away from the same bend point; mark the date of last re-tie directly on the knot with a paint marker.

ContextIf the rope uses a sewn termination or a mechanical splice at the rigging end, inspect the stitching for thread breakage and the rope body immediately adjacent for crushing damage. Hardware terminations using thimbles and clamps should show no movement of the thimble relative to the rope, and the thimble should not be cracked or deformed. A termination that shows any slippage under load — even 1 mm of movement — must be entirely redone by a qualified rigger before the rope is returned to service.

ContextLay each strap flat and check both faces and both edges under direct light. The edges are the highest-wear zones — look for fraying (longitudinal fibers separating from the weave edge), cuts from contact with sharp hardware, or a chalky or powdery texture that indicates UV degradation. Straps that have faded significantly in color have absorbed UV damage; fading combined with any surface texture change warrants retirement. Check the load rating label on each strap — if the label is unreadable, the strap is immediately retired, as you cannot verify its specification without this information.

ContextMetal buckles should release and engage smoothly without requiring excessive force. Test each buckle under a light hand load — it must grip the webbing without any slippage. Any buckle that slips even slightly under a moderate hand load is unsafe for overhead use. Inspect adjuster slots for deformation that would allow webbing to slip through under shock load. Stitched loops at the termination end should show no thread pulling, fraying, or separation of the stitching bar from the webbing body.

ContextIndustry practice for aerial arts fall protection requires mats covering at minimum the floor area directly beneath the apparatus plus a 1.5-meter (5-foot) margin in all directions for standard low-level practice. For drops from heights above 5 meters, consult a certified rigging professional for specific mat stacking specifications. Measure and record actual mat dimensions each month — mats shift, get moved between studios, or are partially used as props. Document any coverage gap and do not permit unsupported drops until it is corrected.

ContextPress a palm firmly into each mat at multiple points and time the rebound. A functional mat rebounds to its original shape within 2 seconds; a mat that stays compressed or rebounds slowly indicates foam fatigue, which means it provides insufficient deceleration on impact. Cover tears allow moisture in, causing foam degradation and mold growth — check seams and corners where covers split first. Weigh each mat periodically and record the value; an unexplained increase in weight indicates moisture absorption and the mat should be opened and dried or replaced.

ContextMats that slide on smooth floors have caused serious ankle and knee injuries when a performer lands at the mat edge, which then moves out from under them. Mats should either interlock with adjacent mats using tongue-and-groove edge systems or be placed over non-slip rubberized matting. Check the floor-contact surface of each mat for worn anti-slip coating — if the mat slides more than 2 cm on the floor when pushed with moderate force, add a non-slip base layer before the next session.

ContextWalk the full fall zone under and around each apparatus and remove all non-essential items. Measure the horizontal clearance between the performer's movement envelope and any fixed obstacle — wall, column, mirror frame, or barre. Minimum horizontal clearance is 1 meter for low-level static work and 1.5 meters for drops or dynamic swinging work. Document and photograph any permanent obstructions that cannot be removed so that specific rigging adjustments or movement restrictions can be implemented and communicated to all instructors.

ContextAll performance and work lights should function at full brightness — flickering or intermittent lights are a distraction hazard. More critically, check for any light fixtures, cables, decorative hangings, or electrical conduit that fall within the aerial movement arc. A performer swinging into a pendant light or clipping a cable has caused real injuries. Any fixture or cable should be a minimum of 0.5 meters outside the outermost swing arc of the apparatus at full extension.

ContextIf your studio uses a sound or music system during training, the emergency stop — a prominent and clearly marked switch that immediately cuts all music and brings lights to full — must be tested monthly. Confirm there is a working phone or communication device within or immediately adjacent to the aerial space. A student suspended with a trapped limb or experiencing loss of consciousness requires immediate emergency services, and seconds matter. Check that the emergency contact list, including the address of the nearest hospital with trauma capability, is posted visibly near the entrance.

ContextA verbal confirmation that everything looks fine carries zero legal or operational weight. Your inspection log must record the date, the inspector's printed name and signature, each specific item inspected, its condition (pass, fail, or monitor), and any corrective action taken or scheduled with a completion date. Store logs in a durable binder at the studio and maintain a digital backup. In the event of an incident, your inspection records are the primary defense against negligence claims — and more importantly, they reveal maintenance patterns that predict future failures before they become injuries.

ContextAttach a visible red tag to any item that failed inspection and move it to a physically separate and ideally locked storage area — not just a different shelf in the same studio. Verbal quarantine systems fail in practice; a tagged item in an accessible space will be used by someone who did not receive the verbal briefing. The tag must state the date removed from service and the reason. This information is also entered in the inspection log so there is a traceable record if the item is later assessed for repair or discarded.

ContextDistribute inspection results via email, a posted notice, or a studio communication platform before the next class begins. Verbal briefings are insufficient if a class is taught by someone who was not present for the briefing. If any apparatus is out of service, confirm the schedule has been updated so no classes are inadvertently planned around it. Each aerial instructor should sign an acknowledgment of the inspection report, creating a documented chain of communication.

ContextSome jurisdictions and certifying bodies such as AYSA, AFAA, and Cirque Canada require instructors to hold a current first-aid certification as a baseline condition of instruction. Verify that each aerial instructor's credential covers the specific apparatus they are teaching — a certification in aerial silks does not automatically qualify an instructor to teach lyra or trapeze. Track expiry dates in a staff records file; a lapsed certification creates an insurance coverage gap and personal liability exposure for both the instructor and the studio owner.