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“Airline and manufacturer experience in developing scheduledmaintenance for new aircraft has shown that more efficient programscan be developed through the use of logical decision process”
MSG-3 Document
Objective = To present a means for developing the scheduledmaintenance tasks and intervals which will be acceptable to theregulatory authorities, the operators, and the manufacturers.
The MSG-3 method is a tool to develop scheduled maintenance tasks
Scheduled Maintenance RequirementMRB Process – MSG Methodology
With MSG-3, the scheduled requirements will be developed via a guidedlogic approach and will result in a task-oriented program.
The logic’s flow of analysis is failure-effect oriented :It does not start with an evaluation of proposed tasks but with the most important factor determining the task, namely the consequences of a functional failure.
The terms ‘Hard-Time’, ‘On-Condition’ and ‘Condition Monitoring’ are not used in MSG-3 Logic.
Items that, after analysis, have no scheduled task specified, may be monitored by an operator’s reliability program.
Scheduled Maintenance RequirementMRB Process – MSG Methodology
The Operator / Manufacturer Scheduled Maintenance DevelopmentDocument “MSG-3” is written by the Maintenance Steering Group - 3Task Force organized under the leadership of the ATA.
The working portions of MSG-3 document are contained in 4sections, each of which contains its own explanatory material anddecision logic.
• Systems / Powerplant, including components and APU’s
• Aircraft structure• Zonal inspections• Lightning / High Intensity Radiated Field (L / HIRF)
Scheduled Maintenance RequirementMRB Process – MSG Methodology
The ATA MSG-3 document is not a document that contains all the procedures /details necessary for analysis
A Policy and Procedures Handbook should be prepared prior to thecommencement of the activities, considering guidelines coming from MSG3methodology, AC 121-22A, JAA GM (Sect.2-Part 2-Sect.16), …
A380
Scheduled Maintenance
Policy and ProceduresHandbook
Relationship of MSG-3 Document and PPH
Scheduled Maintenance RequirementMRB Process – MSG3 vs PPH
The Maintenance Review Board (MRB) is responsible for approving the initial minimum scheduled maintenance requirements, which are contained in the MRB Report and revisions
MRB Process – Organization / duties
The Industry Steering Committee (ISC) - establishes the policies (see PPH …), - directs the activities of the MWGs,- is responsible for the establishment of the MRBR Proposal.The ISC activities will be coordinated with the MRB Chair through the ISC Chair / Co-Chair
The Maintenance Working Groups (MWG) will review, amend and endorse the MSG3 analysis proposals made by the manufacturer and provide an initial list of minimum scheduled maintenance tasks and intervals to the ISC.
Scheduled Maintenance RequirementMRB Process – Organization & Administration
• Establishment of the organization (MRB, ISC, MWGs)• Development of procedures, and interval frame• ISC and MWG Meetings - planning • Establishment of the PPH
MRB / ISC / MWG member trainingManufacturer MSIs & SSIs selectionISC agreement on MSIs & SSIs selectionsManufacturer preparation of Analysis dossiers for MSIs /
SSIs / ZonesReview of MSI / SSI / Zone analysis during MWG meetingsHarmonization of Structure & System tasks with ZonalMWG results presented to ISCCompilation of MWG Outcomes / Preparation of MRBR
Proposal by the ISCSubmission of MRBR Proposal to the MRB
Final review of the MRBR Proposal by the MRBApproval of MRB ReportPublication of MRB Report
3 - Approval phase
1 - Preparation phase
2 - Working phase
Scheduled Maintenance RequirementMRB Process – Main Phases
• The Airworthiness Limitations Section (ALS) is part of the compliance to the Instructions for Continuous Airworthiness required by CS 25.1529, Appendix H, paragraph 25.4.
• The ALS is the repository for stand-alone documents that are approved independently from each other, by the TC auth.
• It comprises the following documents (depending on a/c program):
- ALS Part 1 : Safe Life Airworthiness Limitations Items- ALS Part 2 : Damage Tolerant Airworthiness Limitations Items- ALS Part 3 : Certification Maintenance Requirements- ALS Part 4 : Ageing System Maintenance- ALS Part 5 : Fuel Airworthiness Limitations- ALS Part 6 : Aircraft Information System Security
Compliance with the requirements promulgated in these documents is mandatory.