Module 2

• Maintenance of airframes and powerplants - is one of the most critical segments of the aviation industry
• TBO - Time between overhaul
• Factors affect engine life:

  • Environmental Factors
  • Operational Factors
  • Design Factors
• Top Overhaul - is limited to the engine cylinder
• Owner or Operator - where the final decision regarding whether to perform a top overhaul or major overhaul belong
• Overhauled Engine - engine that has been disassembled, cleaned, inspected. repaired as necessary, reassembled. and tested according to the manufacturer's instructions and specifications
• Rebuilt Engine - does not have to carry the previous operating history when it is returned to service. It can be said that the engine has been granted zero time
• Major Overhaul - entails a complete engine reconditioning
• Major Overhaul - process of taking apart, inspecting, repairing, reassembling, and testing an entire engine
• Serviceable Part Tolerance Limits -are used for parts being reinstalled
• New Part Tolerances Limits - are used with any new parts
• The basic steps of the overhaul process are as follows:

  l. Receiving inspection

  2. Disassembly

  3. Visual inspection

  4. Cleaning

  5. Structural inspection

  6. Dimensional inspection

  7. Repair and replacement

  8. Reassembly

  9. Installation

  I0. Engine testing and run-in

  11. Preservation and storage
• Manufacturer's Overhaul Manual - where every engine overhaul instructions is carried out from
• Manufacturer's overhaul manual - provides information on all procedures of a special nature and on general procedures for the disassembly
• Certificated Repair Station - is defined by Federal Aviation Regulations as "a facility for the maintenance, repair, and alteration of airframes, powerplants, propellers or appliances, holding a valid repair station certificate with appropriate ratings issued by the Administrator.''