Maintenance Steering Group-3 (MSG-3)
Maintenance Steering Group-3 (MSG-3) : MSG-3 is a voluntary structured process developed by the industry and maintained by ATA to make decisions used to develop maintenance and inspection tasks and intervals for an airplane. "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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