General Performance Rules, Maintainers

Additionally, Part 42 outlines general performance requirements for all maintainers regarding the following maintenance functions:

• Modifications and repairs
  
• The removal of tools and other items after carrying out maintenance
  
• The independent inspection of critical control system maintenance
  
• How to deal with defects
  
• Retaining maintenance records for aircraft and aeronautical products
  
• Fitting of parts to aircraft or aeronautical products
  
• Use of materials in aircraft and aeronautical products
  
• Control of unserviceable or unsalvageable parts
  
• Control of unapproved parts