Aircraft maintenance program
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The document outlines various maintenance strategies and their classifications, including on-condition and hard time limit policies. It discusses the Maintenance Steering Group (MSG) approach, focusing on MSG-3 revisions aimed at enhancing user-friendliness and establishing safety and reliability standards. Additionally, it covers maintenance packaging options and considerations, emphasizing the balance between efficiency, resource allocation, and operational requirements in maintenance tasks.
Aircraft maintenance program
- 2. Maintenance Steering Group Conditioning Monitoring • Applies to items that have neither Hard Time limits nor On Condition maintenance as their primary maintenance policies On –Condition • A repetitive inspections or tests to determine the condition of units or systems, comprising servicing, inspecting, testing, calibrating and replacement. Hard Time limit • A maximum interval for performing maintenance tasks on a part or unit. Such intervals apply to overhaul, but also to the total life of the part or unit.
- 3. Maintenance Steering Group MSG 2 •Process Oriented MSG 3 •Task Oriented
- 4. MSG 2 Analysis Task that can be done Tasks that have to be done Tasks that should be done
- 5. MSG 3 0 Task oriented process, analyses through system failure from the top down. 0 Results in maintenance tasks that are performed for safety, operational or economic reasons. 0 It involves preventive maintenance, performed before failure occurs (and is intended to prevent failure) as well as failure finding tasks. RCM • The Reliability Centered Maintenance (RCM) concept refined the logic process leading to MSG- 3. MSG 3 Rev 1 • This was a refining of the original MSG-3 in order to make it user- friendlier. It led to the elimination of the Operating Crew Monitoring strategy in the original MSG-3 MSG 3 Rev 2 • This is a revision of the MSG-3 policy. It provides additional clarification and guidelines on development of Corrosion Prevention Control Programs (CPCP).
- 6. MSG 3 Objective 0 To ensure realization of inherent safety and reliability levels of the equipment 0 To restore safety and reliability to their inherent levels when deterioration has occurred 0 To obtain the information necessary for the design improvement of those items whose inherent reliability proves inadequate 0 To accomplish these goals at minimum total cost, including maintenance costs and the cost of residual failure
- 7. MSG 3 Divided Into 2 Sub Task Scheduled Task • Lubrication/servicing (LU/SV) • Operational Visual check (OP/VC) • Inspection-General Visual/ Functional check (GV/FC) • Detailed Inspection (IN) • Restoration (RS) • Discard (DS) Unscheduled Task • Scheduled tasks accomplished at specific intervals • Reports of malfunction (usually originating from operating crew) • Data analysis
- 8. MSG 3 Flow Analysis
- 9. Maintenance Package Manufacturer • To provide the operator with packaging options for fleet maintenance program • Increase the production efficiency of an organization Operator • Increase aircraft availability • Reduce production costs
- 10. Maintenance Package Considerations Operational considerations • Route structure • Flight length • Frequency of flight Commercial considerations • Traffic patterns • Seasonal constraints Technical considerations • Maintenance program • Manpower skills • Tooling
- 11. Block Packaging Background 0 This is focused on the principle of grouping all maintenance tasks that require frequent repetition under a letter check (i.e. “A”, “B”, “C”, “D” Checks). 0 This method produces a small number of relatively large work packages having the disadvantage of a relatively long maintenance ground time.
- 12. Block Packaging Conditions Large airplane fleet High utilization Spare airplane available Long range operation Flexible manpower Non-scheduled maintenance Single centrally located maintenance base Utilization varies with calendar season Contract maintenance
- 13. Block Packaging Advantage Disadvantage Advantage • Reduces spare requirements at out stations • Increased ground time • Logistical considerations for spares are also simplified. • Accomplishment of modifications • Rectification of non-routines • More efficient sequencing of long jobs Disadvantage • Manpower requirements • the risk of the airplane becoming a parts department • High component removal
- 14. Equalized/Phase/Progressive Package • Tasks are arranged into many small packages all having approximately the same ground time, less than 8 hours Ground Time • Satisfies the availability requirements specified by airline operations and scheduling • The larger letter checks are segmented into smaller but more frequent work packages Commercial • Helps to get the maximum life out of life-limited componentsComponent
- 15. Equalized Considerations Small aircraft fleet Low & Constant utilisation No spare airplane Short range operations Manpower equalization Scheduled operations Multiple maintenance locations Maintenance performed in house
- 16. Equalized Benefit & Loss Advantage • Simplifies manpower planning • High aircraft availability • Reduced ground time • Frequent visit supports full component life • Balanced workload on small fleets Disadvantage • High spare requirement at out stations • Increase in production planning and scheduling workload • Careful planning is required due to the limited ground time • There is limited time for the accomplishment of modifications • Short jobs are inherently inefficient • Limited time to identify and rectify non-routines
- 17. Thank You