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MRA LOA Question

Jim Meade

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The purpose of the MRA/LOA system is to meet the requirements of ASTM. ASTM task the aircraft manufacture to keep track of any changes major or minor made to the aircraft, kind of like the FAA's for 337. Also the manufacture must verify that these changes comply with ASTM standards. So yes, they are for individual aircraft.

That being said there have been a few items over the years that they have issued fleet wide approvals for. Many of them are listed here on the forum.

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