S4000P – International specification for developing and continuously improving preventive maintenance



For a new Product or for a 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 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 determined if applicable and effective. Results must be available prior to Product design-freeze milestones (latest prior to the critical design review (CDR) of the Product).
According to the overall ASD scope, the specification S4000P must cover all kind of Product types including any complex technical platform, system, equipment or facility (eg. 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 start the Product in-service phase.
During the Product in-service phase, S4000P provides an additional process that allows to review 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 and precised for a Product under analysis in an analysis guideline or -handbook to be acceptable to regulatory authorities (if involved), maintainers, operators, manufacturers and suppliers.


The main purpose of this specification is to assist regulatory authorities and all parties involved in the analysis process in developing and releasing initial Preventive Maintenance Task Requirements (PMTR) and intervals for new Products prior entry into service. S4000P analysis methodologies remain applicable for later optimizations/modifications of the Product design in Product systems 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 the mechanism for continuously improving Product maintenance during its in-service phase.
Every development or improvement of a preventive maintenance task for a Product supports at least one of the following aspects:

S4000P main advantages and innovations:

  1. In comparison to other known analysis methodologies, the application of ASD S4000P is not limited to pre-defined Product types like on military or civil aircraft only. The S4000P analysis principles are developed by industry to be applicable for all complex technical Products. This comprises Products on air, on ground, under the ground, on sea, under the sea level or even in space for civil and/or military usage.
  2. To cover the whole Product life cycle, S4000P provides the innovative ISMO methodology to prove and optimize the Product maintenance during its complete in-service life in addition to the Product maintainability analysis that has to take place during the design and development phase provided as Engineering/Design Support.
  3. When defining preventive maintenance tasks, the S4000P Product system analysis takes into account Product-integrated test- and condition monitoring technology being realized more and more in modern Products.
  4. The S4000P Product structure analysis covers all kind of present and of future Product structure materials and material combinations.
  5. The S4000P Product zonal analysis is based on a modular analysis concept to cover the zonal analysis of all kind of Product types.

S4000P specification development and update process

ASD S4000P development work started in 2013 and the first publication took place in May 2014 as Issue 1.0.
European experts from the following international companies and authorities are presently responsible for future developments and updates of the ASD S4000P specification:

AIRBUS Defence & Space


AIRBUS Defence & Space


AIRBUS Helicopters


Aviation Requirements Ltd.

United Kingdom

Babcock International Group (LSC Group)

United Kingdom



Logistikkommando der Bundeswehr (LogKdoBw)/p>


Saab AB


Thyssenkrupp Marine Systems (tkMS)

United Kingdom


United Kingdom

S4000P specification maintenance

An ongoing maintenance process for S4000P is required to ensure the continued development of future issues of this specification. As an initial approach, the maintenance process will commence by providing a commenting template on this website.

Any questions or suggestions for supplement and/or improvement of the specification can be forwarded to the S4000P working groups via the European contact e-mail written below.

To submit comments or a request for clarification download the S4000P-RFC

To assist completing this form, S4000P-RFC-CP-Instructions are also available.

Please forward the completed template to:

S4000P Steering Committee



S4000P download

The specification ASD S4000P Issue 1.0 can be downloaded for free using the following link:


Copyright and user agreement

Copyright © 2014 by AeroSpace and Defence Industries Association of Europe – ASD

Specification usage rights: Refer to S4000P-A-00-00-0000-00A-021A-A

The description of the specification on this page is made available for reuse under the Creative Commons Attribution-Sharealike 3.0 Unported License (CC-BY-SA).

Page last updated on 4 August 2016