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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.
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http://ecfr.gpoaccess.gov/cgi/t/text....0.1.1&idno=14
By Convention, improperly installing a cylinder head or misadjusted valves will effect powerplant operation and is a major repair by itself.
Glider,
I am not argue with you anymore. The facts are plain.
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you will not see technical orders that are applicable to operational units that do not make it into the new edition.
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