About S4000P

New S4000P Issue 2.1, dated April 2021:

The S4000P Steering Committee herewith publishes the Issue 2.1 of the international specification ASD S4000P.


ASD S4000P Issue 2.1 replaces both Issue 1.0 and Issue 2.0 without deleting any core analysis processes or methodologies which have already been provided in these previous document issues.

Issue 2.1 was elaborated in order to eliminate any conflict with potential “copyright” – claims and/or requirements from other analysis methodologies and to improve the content of the previous Issue 2.0 concerning identified editorial aspects.

The front matter pages in this Issue 2.1 explain all implemented changes and updates in comparison to the previous Issue 2.0.

ASD S4000P version Issue 2.1 can be downloaded for free from the Downloads page.

Purpose of S4000P Issue 2.1:

The primary objective of analysis methodologies based on S4000P Issue 2.1, Chapter 2 is to assist regulatory authorities (if involved), other bodies being responsible for safety, conformity with law and environmental integrity, to achieve customers’/operators’ specification data or expectations and to support all parties being involved in the analytical process developing, approving and releasing the identified Preventive Maintenance Task Requirements (PMTR) of AeroSpace and Defence Industries of Europe (ASD) Supported Products (SP).

PMTR can be subdivided into the following requirement types:

  1. PMTRI: Preventive Maintenance Task Requirements with repetitive scheduled Intervals and
  2. PMTRE: Preventive Maintenance Task Requirements being applicable after special Events without any repetitive scheduled intervals.

S4000P Issue 2.1 Chapter 2 provides analytical methodologies for developing both PMTRI and PMTRE during the Design and Development (D&D) phase of a SP. These methodologies are also applicable to analyze technical modifications and/or supplements of the design in systems and/or of structure and/or of zones of the SP during later Life Cycle (LC) phases.

The secondary objective of this specification is to continuously improve preventive maintenance of the SP on basis of analysis methodologies provided in S4000P Chapter 3. For a continuous improvement of all documented preventive maintenance tasks, in-service data/feedback must be taken into account by the responsible analyst(s).

For the review and optimization of a valid SP maintenance program, the In-Service Maintenance Optimization (ISMO) process is applicable. To review and optimize the sets of preventive maintenance tasks, which have to be performed after special events, a different process is defined in S4000P Chapter 3.

Both the initial PMTR development and the subsequent review and improvement of the preventive maintenance tasks must support the achievement of the following aspects:

  • Ensure / maintain safety, including safety/emergency systems and/or emergency equipment for the SP,
  • Avoid any conflict with law(s) and/or any significant impact on environmental integrity (ecological damage) during mission/operation and/or during maintenance activities,
  • Optimize mission/operational capability/availability,
  • Optimize economy (reduction of Life Cycle Costs (LCC).

For individual analysis projects either all of the above listed aspects or only a limited set of these aspects can be selected to be analysis-relevant according to the project-specific analysis guideline/Policy and Procedure Handbook (PPH).

More detailed information related to the content of Issue 2.0, identifying advantages and innovations:
  1. In comparison to other known analytical methodologies, the application of S4000P is not limited to pre-selected SP types like military and/or civil aircraft for example. All S4000P analytical principles are developed by industry to be applicable for all complex technical SP. This comprises SP operating in the air, on the ground, under the ground, floating, submerged or even in space for civil and/or military usage.
  2. S4000P is an integrated part of the “ASD/AIA S-Series IPS specifications” and ensures effective data generation and data exchange with other ASD/AIA specifications, customers, responsible authority(s)(if involved), design departments, suppliers, supportability departments etc. to enable an effective and integrated Customer support and Integrated Product Support (IPS). To enable a dynamic data exchange in-between the ASD/AIA S-Series IPS Specifications and with external parties in the future, the S4000P data model will be provided in Chapter 5 in next document issues.
  3. The application of S4000P ensures development and continuous improvement to a balanced and effective preventive maintenance regime for the SP, which also results in a reduction of corrective maintenance effort.
  4. To cover the whole life cycle of a SP, S4000P is not limited on an initial development of PMTRI and PMTRE during the design and development phase of a SP only (see Chapter 2). It provides additional processes to continuously improve the set of preventive maintenance tasks with repetitive scheduled intervals (see Chapter 3).
  5. When defining PMTRI for SP systems on basis of Chapter 2, S4000P synergizes identified PMTRI with maintenance tasks being defined on the basis of integrated test- and condition monitoring technology being realized more often in future and modern SP.
  6. When defining PMTRI for the SP structure according to S4000P Chapter 2, identified maintenance task requirements are synergized with the integrated structure condition monitoring technology.
  7. S4000P covers the analysis of all kinds of present and future structural materials and material combinations.
  8. A modular and flexible analysis concept enables a zonal analysis of all types of SP to define PMTRI for its zones in S4000P Chapter 2.
  9. Information concerning the consolidation and harmonization of different PMTRI resulting from system-, structure-, zonal analysis and other task requirements or limitations (if any) is provided in S4000P Chapter 2.
  10. In addition to PMTRI development S4000P Chapter 2 contains a process for the initial development of PMTRE selected for special events impacting a SP.
  11. S4000P Chapter 3 describes the ISMO process to optimize PMTRI and consequently, the resulting preventive maintenance tasks with repetitive scheduled intervals in the valid documentation of the SP.
  12. S4000P Chapter 3 is completed with a process applicable for the in-service review, including an optimization of PMTRE.
  13. S4000P Chapter 4 describes the interfaces with inputs to and outputs from the specification.
  14. S4000P Chapter 5 will describe the data model and data exchange (in future document issues).
  15. S4000P Chapter 6 describes relevant abbreviations, definitions and acronyms.
  16. S4000P Chapter 7 contains analysis examples and examples for PPH contents.


NATO has recommended the ISMO process of S4000P Issue 1.0 Chapter 3 already in 2017 on the basis of the document NATO STANREC 4795. The ISMO process from Issue 1.0 remained unchanged in Chapter 3 of Issue 2.0 and in this Issue 2.1.

S4000P specification development and update process

The initial ASD S4000P development work started in 2013 on the basis of several ASD draft specification versions. The first publication of ASD S4000P Issue 1.0 took place in May 2014. Issue 2.0 was published in August 2018 and this Issue 2.1 was published in conjunction with the first block release of the ASD/AIA S-Series IPS specifications.

For all document Issues 1.0, 2.0 and 2.1 elaborated and published up to now, the responsible S4000P working groups have been composed of European experts from international companies and authorities listed in the following table:

AIRBUS Defence & Space Germany & Spain
AIRBUS Helicopters Germany
Aspire Consulting Ltd United Kingdom
DBM Engineering Solutions Ltd United Kingdom
Babcock International Group (LSC Group) United Kingdom
BAE Systems United Kingdom
Fox Flight Systems Germany
HICO-ICS GmbH t/a HICO Technology AUSTRIA (HICO-AT) Austria
Isselnord S.R.L. Italy
Sopra Steria France & Germany
Logistikkommando der Bundeswehr (LogKdoBw) Germany
Saab AB Sweden
thyssenkrupp Marine Systems (tkMS) United Kingdom
UK MoD United Kingdom


The US Company O’NEIL & ASSOCIATES, INC. has supported the S4000P Steering Committee (SC) incl. all S4000P working groups in the frame of the editorial work necessary prior to the publication of the specification Issues 1.0, 2.0 and 2.1. For future specification issues the involvement of AIA industry members and experts is expected to form a combined ASD/AIA team instead of the present European ASD team.

Copyright and user agreement

Copyright of the specification ©2014-2021 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 19th October 2021