High Risk Work Licence - Non-Slewing Mobile Crane CN case studies
High Risk Work Licence - Non-Slewing Mobile Crane CN · Put your knowledge to work in context.
The Non-Slewing Mobile Crane licence - commonly called the CN licence - is an Australian high risk work licence for operating mobile cranes that cannot slew (rotate) while carrying a load. Typical machines include Franna-style pick-and-carry cranes and other articulated or rigid non-slewing mobiles used across construction, civil works, mining, manufacturing, and maintenance. The High Risk Work Licence - Non-Slewing Mobile Crane CN case studies are 5 cases and about 2,331 words.
1Outrigger Setup on a Suspected Fill Slope
You are setting up a 25 t non-slewing pick-and-carry crane on a compacted site beside a new warehouse. The lift plan calls for full outrigger extension on the north side, but the ground there is a 1.2 m deep band of loose fill over a stormwater trench, showing recent tyre ruts and a slight depression after overnight rain.
497 words, about 2 min2Pick-and-Carry with a Loaded Tyre and a Soft Verge
You are operating a 20 t non-slewing mobile crane fitted with a pick-and-carry chart. The task is to move 2.8 t of steel plate 60 m across a yard to the fabrication shed.
502 words, about 3 min3Two-Way Radio Failure During a Blind Lift
You are the crane operator on a non-slewing mobile crane lifting a prefabricated air-handling unit, 1.9 t, onto a roof plant deck. The dogger is on the deck, out of your direct sight, and communication is by two-way radio on a shared site channel.
457 words, about 2 min4Load Chart Selection When the Boom Section Is Unclear
You are asked to lift a 3.0 t generator from a truck tray onto a plinth using a non-slewing mobile crane. The crane has a telescopic boom with a jib stowed on the side, and the load chart book in the cab is worn, with two pages partly illegible.
423 words, about 2 min5Defect Found at the Pre-Start Inspection
At the start of a shift you complete the pre-start inspection on a non-slewing mobile crane. You find a small hydraulic weep at a boom-luff cylinder gland, a slightly frayed edge on the hoist rope where it spools near the drum flange, and a missing split pin on a hook latch.
452 words, about 2 min