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Maintenance Steering Group-3 (MSG-3)

MSG-3 is a voluntary structured process developed by the industry and maintained by ATA (A4A) to make decisions that are used to develop scheduled maintenance and inspection tasks and intervals for aircraft that will be acceptable to the regulatory authorities, the operators, and the manufacturers.

SkyLibrary has the following definition:

“The MSG-3 (the MSG stands for “Maintenance Steering Group” but the abbreviation is universally used) is a decision-logic process for determining by reliability principles the initial scheduled maintenance requirements for new aircraft and/or engines.

The process identifies each Safety Significant Item (SSI) and applies a function, failure, failure effects and causes analysis on each using Failure Modes Effect Analysis (FMEA). Damage to an SSI is considered possible from accident, environment or fatigue . The output from origins. MSG-3 output is used as the basis for an MRB Report which, when agreed by the NAA involved, will set the principles for each MRO to develop a Maintenance Schedule for an aircraft type. MSG-3 was first adopted in 1980 as a development of the earlier MSG-2 which itself was a development of MSG-1 procedures which were used in the development of the initial minimum scheduled maintenance inspections recommendations for the Boeing 747. Since 1980, a number of revisions have been made to MSG-3, the most recent in 2007 but, as yet, ‘MSG-4’ has not followed.”

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