S4000P - International specification for developing and continuously improving preventive maintenance is a specification developed jointly by a multinational team from the Aerospace and Defence Industries Association of Europe (ASD) and Aerospace Industries Association (AIA). S4000P is part of the S-Series of ILS specifications and is integrated in the global ILS process defined by SX000i - International guide for the use of the S-Series of Integrated Logistics Support (ILS) specifications.
The main purpose of this specification is to assist all parties, including regulatory authorities, involved in the analysis process developing and releasing initial PMTR and intervals for new products prior entry into service. S4000P analysis methodologies remain applicable for later optimizations/modifications of the product design and/or of product structure and/or of product zones. Once developed, authorized and packaged into interval clusters in a product OMP, the S4000P In-Service Maintenance Optimization (ISMO) process enables continuously improving product maintenance during its in-service phase.
Every development or improvement of a preventive maintenance task requirement for a product supports at least one of the following aspects: ensure/maintain product safety, including safety/emergency systems and/or emergency equipment avoid any conflict with law and/or significant impact on environmental integrity (ecological damage) during product mission/operation and/or maintenance optimize mission/operational capability/availability of the Product optimize product economy (Life Cycle Costs = LCC)
Rationale for S4000P
For a new product or for a new product variant, the maintainability of the intended product design must be assessed by maintainability specialists providing engineering support. Accumulated in-service experience with other products must also be taken into account. In parallel to the product design process, Preventive Maintenance Task Requirements (PMTR) with intervals and/or redesign requirements must be assessed on an analytical basis and be determined if applicable and effective. Results must be available prior to product development milestones, latest prior to the Critical Design Review (CDR) for the product.
According to the overall ASD scope, the specification S4000P must cover all types of products including any complex technical platform, system, equipment or facility (e.g. on air/sea/land, under the sea-/ground-level, in space). The S4000P analysis methodologies allow a structured, traceable and complete determination of PMTR with intervals for a product, which become the basis to elaborate and document a product maintenance program/Operators' Maintenance Program (OMP) prior to starting the product in-service phase.
During the product in-service phase, S4000P provides an additional process that allows reviewing the completeness and effectiveness of preventive maintenance tasks from a product OMP, taking into account product in-service experience and the state-of-the-art analysis methodologies. Such a review of the OMP is to be fully traceable and applicable for all products types.
Every S4000P analysis methodology or process must be tailored for the product under analysis in an analysis guideline or handbook to be acceptable to regulatory authorities (if involved), maintainers, operators, manufacturers and suppliers.