used, and the importance of adhering to these procedures K12 Explain how the components are to be aligned, adjusted and positioned prior to securing, and the tools and equipment that is used K13 Explain the importance of using the specified components and joining devices for the assembly, and why they must not use substitutes K14 Explain where appropriate, the application of sealants and adhesives within the assembly activities, and the precautions that must be taken when working with them K15 Outline the quality control procedures to be followed during the assembly operations K16 Explain how to conduct any necessary checks to ensure the accuracy, position, security, function and completeness of the assembly K17 Explain how to detect assembly defects, and what to do to rectify them (such as ineffective joining techniques, foreign objects, component damage) K18 Outline the methods and equipment used to transport, lift and handle components and assemblies K19 Explain how to check that the tools and equipment to be used are correctly calibrated and are in a safe and serviceable condition K20 Explain the importance of ensuring that all tools are used correctly and within their permitted operating range