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Wire strike avoidance
Any aircraft flying below 500 ft is at risk of a wire strike. Any agricultural aircraft, fixed wing or helicopter, are especially susceptible due to the nature of the work they do.
Wire strikes are preventable, but only with a well-planned safety programme to identify hazards and put mitigations in place.
With Worksafe NZ, we've developed an information sheet providing basic guidance on how to manage wire hazards.
Download the Wire Strike Information Sheet (PDF 177 KB)
Wire strikes often occur in fine weather when there’s good visibility. In many cases the pilots knew the wires were there.
Important things to think about include:
- Position and angle of the sun and associated glare or levels of light.
- Unplanned changes to the operation.
- Wires are thin and often nearly impossible to see until it’s too late.
- Your workload, vision limitations, and a small lapse in concentration can lead to a fatal mistake
- The number of flying hours you have logged doesn’t lower your chance of a wire strike.
- Ongoing training on wire strikes is essential.
Identify wire hazards
The farmer must provide a detailed hazard map showing wires, high fences, and other hazards, providing as much detail as possible.
Hazards in the surrounding areas, especially turn around areas, must also be identified. In an emergency, you may need to fly outside the intended operating area. You should also talk to neighbouring landowners or other operators who have experience working in the area.
In addition to the hazard map, you should do a full reconnaissance of the area you are about to operate in from both the air and the ground. Take note of any structures that use power and watch for any poles as they may have wires connected that you can't see.
Also watch for single wires strung between farm buildings. They’re particularly hard to see, and can also be attached to hidden structures. Streams, gullies, and rivers all potentially have wires strung across them.
Reduce wire hazard risks
Wherever possible, you must reduce risks to ensure the farm is safe for aerial operations. This could mean the farmer will be required to remove, or lower, all aerial wires before operations start.
Where that can’t be done, mitigation needs to take place. Such as marking the wires, and putting them on a hazard map that you can give your pilot.
On the day of your safety briefing, you should discuss any wires or other hazards with your contractors. You should have written documentation detailing the information about any wire hazards in a contract.
Manage and communicate wire hazard risks
A healthy and safe workplace starts with identifying and understanding what your work-related health and safety risks are; particularly those that have the potential to cause people serious injury or illness.
Make sure everyone involved in an operation, such as the farmer and ground crew, are fully aware of potential risks and what to do in an emergency.
Plan for emergencies
As well as identifying and managing hazards, you, the farmer, and ground crew need to know what to do - and who is responsible for what - in an emergency. Some questions to think about are:
- Are there suitable places for an emergency landing?
- Who has first aid training and a medical kit?
- Are you within cellphone range?
Use a wire cutting system
Operators with aircraft working routinely in the wire environment should consider installing a wire cutting system on their aircraft to help manage this risks.
A wire cutting system is designed to channel a wire or cable into the cutter to score it as it travels into the cutter assembly in order to "cut" the wire before aircraft contact. The system is generally fitted to undercarriage legs and to the middle of the windscreen.
Train for wire strike avoidance
We recommend that all pilots be trained in wire strike avoidance. Wire environment courses are regularly run in New Zealand.
All aviation accidents and incidents should be reported to the CAA. We need to know the cause of an occurrence to help industry understand how to prevent it from happening again. Our investigators will work with you to find out what happened and why.
For more advice about wire safety, talk to your industry body for further guidance.
Check out the following Vector magazine articles for more information: