This element covers the practical skills and underpinning knowledge required to safely fell trees up to 380mm diameter using a chainsaw and process them in
Topic Synopsis
This element covers the practical skills and underpinning knowledge required to safely fell trees up to 380mm diameter using a chainsaw and process them into manageable lengths. Learners must demonstrate competence in site preparation, escape route provision, controlled felling techniques, branch removal (snedding) and cross-cutting, as well as the procedures for taking down hung-up trees, all while adhering to relevant health and safety legislation and industry best practice.
Key Concepts & Core Principles
- Risk assessment and emergency planning: Before any felling operation, students must conduct a thorough risk assessment, identify escape routes, and ensure a safe working area (e.g., clearing debris, marking hazards).
- Felling cuts and notches: Mastery of the open-face notch (70° angle) and conventional notch (45° angle) is crucial for controlling the direction of fall. The back cut must be level and above the notch hinge to prevent barber chairing.
- Directional felling techniques: Using the hinge wood to steer the tree, understanding lean, wind direction, and side weight. Techniques include using wedges, felling levers, and winches for difficult trees.
- Processing operations: Safe delimbing (cutting branches from the stem), cross-cutting (cutting the stem into logs), and stacking timber. Correct cutting sequences prevent binding of the chainsaw bar.
- Chainsaw safety and maintenance: Pre-use checks (chain tension, sharpness, oil levels), personal protective equipment (PPE) including helmet, visor, gloves, and chainsaw trousers, and emergency procedures for kickback or chain breakage.
Exam Tips & Revision Strategies
- In a practical assessment, verbalise your decision-making at each step—examiners need to hear your risk assessments, cut selections, and awareness of kickback zones.
- Familiarise yourself with the relevant HSE guidance (e.g., INDG317) and Lantra's own code of practice; examiners will expect you to reference safe working distances and exclusion zones.
- For the knowledge test, memorise key dimensions: minimum holding wood thickness (10% of tree diameter), maximum depth of felling cut before starting triangular step, and safe handling distances (two tree lengths).
- Practice the mechanical advantage setup for winching hung-up trees until it’s second nature—this is often a critical skill that distinguishes competent operators.
- Always demonstrate a 360-degree check and clear shout of 'stand clear' before triggering the final cut; such consistent behaviour aligns with industry good practice and earns marks for safety awareness.
Common Misconceptions & Mistakes to Avoid
- Assuming the felling direction is solely determined by the tree's natural lean rather than considering wind, adjacent obstacles, and escape route safety.
- Neglecting to check for 'barber chair' risk on forward-leaning trees and failing to use appropriate cuts like a bore cut or strap.
- Placing the felling hinge (holding wood) incorrectly—too thick, too thin, or uneven—leading to loss of directional control.
- During snedding, working on the downhill side of the stem, causing risk of the log rolling, or cutting branches under tension from the wrong side.
- When cross-cutting, failing to properly support the log so that the saw is not pinched, often due to incorrect assessment of tension and compression.
- Attempting to take down a hung-up tree by undermining the support tree or pulling from an unsafe position, rather than using a winch or incremental cuts from a safe distance.
Examiner Marking Points
- Award credit for demonstrating a thorough site safety check, including identification of hazards such as overhead cables, uneven terrain, or wind direction, and establishing a safe working zone.
- Credit given for correctly assessing the tree's lean, crown weight distribution, and any defects before selecting an appropriate felling direction and escape route.
- Evidence must show proper use of the chainsaw's chain brake, correct starting procedure, and maintenance of a firm two-handed grip throughout all operations.
- For branch removal (snedding), credit efficient technique: working from the butt to the tip on top and side branches, keeping the saw below waist height, and avoiding terrain contact with the guide bar.
- When processing felled trees, marks awarded for stable positioning of the stem, correct use of compression and tension release cuts, and consistent sizing of logs to specification.
- For hung-up tree scenarios, credit demonstration of a systematic risk assessment, use of winching or breaking cuts, and maintaining an escape route away from the fall path.