Receiving Inspection
• This is the inspection of the engine as it is removed from the aircraft and received at the overhaul site
• The purpose of the receiving inspection is to begin to detect engine defects or required maintenance and to schedule the overhaul process
• Look at the history of the engine as recorded in the logbook - hours, repairs, routine service, etc…..
• Perform a conformity inspection to reveal unapproved accessories
• Review the applicable AD records to determine which AD’s are required during overhaul
Receiving Inspection / Disassembly
Receiving Inspection
• Review service bulletins • Review the overhaul manual and parts manual• In 370 lab you will also review the study guide• Perform a visual inspection to detect obvious
external defects . Perform this inspection prior to cleaning the engine. Look at paint condition, signs of heat damage, fretting, and oil leaks.
• Make an inventory of all extra parts received with the engine such as baffles, fittings, or ignition parts, so that nothing is lost
Regulations Governing Overhaul
• Time Before Overhaul ( TBO )• The manufacturer determines the recommended
number of hours that an engine may be operated before it is overhauled
• Each engine model has a different TBO and they range from around 600 to 2400 hours
• All engines wear, build-up sludge, form deposits, crack, and parts fail that cause them to require overhaul
• Privately owned aircraft (Part 91) may exceed TBO if the engine shows no signs of deteriorated performance
Regulations Governing Overhaul• Rebuilt is the term used to describe an engine that
has been disassembled, inspected, repaired, reassembled, and tested utilizing new tolerances
• Overhauled is the term to describe an engine that has been disassembled, inspected, repaired, reassembled, and tested utilizing serviceable tolerances
• An engine equipped with an integral supercharger that has its case halves separated is a major repair and must be approved by an IA
• An engine equipped with other than spur type propellor reduction gearing, that has its case halves seperated, is also a major repair
Regulations Governing Overhaul
• Any special repairs involving welding, plating,metalizing, or other nonstandard procedures is also a major repair
