Major or Minor repairs Engines
Major or Minor repairs Engines
(OP)
According to the FAA a Major Repair means the following in accordance with Part 1 definitions.
Major repair means a repair:
(1) That, if improperly done, might appreciably affect weight, balance, structural strength, performance, powerplant operation, flight characteristics, or other qualities affecting airworthiness; or
(2) That is not done according to accepted practices or cannot be done by elementary operations.
I would like to get as many points of view on what is considered a major repair to an engine. So I would like to refine it to turbine engines. So for example you want to flame spray a turbine blade, of course this takes a process specification or an engineering authority to accomplish, is it major of minor repair.
Take flame spray in general for an accessory case is it a major or minor repair to build up a bearing hole and line bore it? I might mention this is not covered in most/any engine repair manuals I have read.
Looking for help.
Stache
Major repair means a repair:
(1) That, if improperly done, might appreciably affect weight, balance, structural strength, performance, powerplant operation, flight characteristics, or other qualities affecting airworthiness; or
(2) That is not done according to accepted practices or cannot be done by elementary operations.
I would like to get as many points of view on what is considered a major repair to an engine. So I would like to refine it to turbine engines. So for example you want to flame spray a turbine blade, of course this takes a process specification or an engineering authority to accomplish, is it major of minor repair.
Take flame spray in general for an accessory case is it a major or minor repair to build up a bearing hole and line bore it? I might mention this is not covered in most/any engine repair manuals I have read.
Looking for help.
Stache
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RE: Major or Minor repairs Engines
All that said, a major repair is a repair that will affect / change the operational characteristics of the part that you are repairing. Also, you don't want to change critical dimensions. Another very important point - rotating parts... What may be considered minor on other parts may be very major on a rotating part! Ask yourself the following question every time you are having a doubt: Would I have my wife (husband) and kids (for an aircraft engine) fly in an airplane that has engines with parts that were repaired that way? You will feel the answer.
Coka