About S4000P

New S4000P Issue 2.0, dated 1st August 2018:

The S4000P Steering Committee herewith publishes Issue 2.0 of ASD S4000P.


ASD S4000P Issue 2.0 replaces the previous Issue 1.0 completely without deleting any core analysis processes or methodologies which have already been provided in Issue 1.0.

Issue 2.0 contains additional aspects and solutions related to both preventive maintenance analysis and to preventive maintenance optimization. Also specification-relevant interfaces are explained for the first time. The front matter pages in Issue 2.0 ease the decision for legacy Issue 1.0-based projects, whether selected aspects from Issue 2.0 must or are recommended to be taken over for the remaining Product life cycle.

Both ASD S4000P versions Issue 1.0 and Issue 2.0 can be downloaded from the Downloads page.

Purpose of S4000P Issue 2.0:

The primary objective of this specification is to assist regulatory authorities and all parties involved in the analytical process developing, approving and releasing initial Preventive Maintenance Task Requirements (PMTR). PMTR provide the traceable basis in which to elaborate upon an effective maintenance program/Operators’ Maintenance Program (OMP) for new Products prior to entry into service.

PMTR can be subdivided into the following:

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

S4000P Issue 2.0 provides analytical methodologies for developing both PMTRI and PMTRE. These methodologies are also applicable to analyze technical modifications of the Product design in Product systems and/or of Product structure and/or of Product zones.
A secondary objective of this specification is to continuously improve preventive Product maintenance, documented in a Product maintenance program/OMP on the basis of an update of the set of PMTR during the Product in-service phase. Customer In-service data and feedback must be taken into account. For the optimization of PMTRI the In-Service Maintenance Optimization (ISMO) process is applicable. For the review and optimization process of PMTRE, a different process is defined.

Every PMTR development or the subsequent improvement of the resulting preventive maintenance tasks for a Product in the Technical Publication of the Product supports the following aspects:

  • Ensure / maintain Product safety, including safety/emergency systems and/or emergency equipment,
  • Avoid any conflict with law and/or any significant impact on environmental integrity (ecological damage) during Product mission/operation and/or during maintenance activities,
  • Optimize mission/operational capability/availability of the Product,
  • Optimize Product economy (reduction of Life Cycle Costs = LCC).
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 predefined Product types on military or civil aircraft for example. The S4000P analysis principles are developed by industry to be applicable for all complex technical Products. This comprises Products operating in the air, on the ground, under the ground, floating, submerged or even in space for civil and/or military usage. For a specific analysis project S4000P must be determined in a Policy and Procedure Handbook (PPH).
  2. S4000P is an integrated part of the S-Series of ASD specifications and ensures effective data generation and data exchange with other ASD/AIA specifications, customers, responsible authority (if involved), design departments, suppliers, supportability departments etc. to enable an effective and integrated Customer and Product support.
  3. The application of S4000P ensures development and continuous improvement to a balanced and effective preventive Product maintenance regime, which results in a reduction of corrective Product maintenance.
  4. To cover the whole Product life cycle, S4000P is not limited on an initial development of PMTR during the design and development phase of a Product only (see chapter 2). It provides additional processes to continuously improve the scheduled maintenance tasks with intervals resulting from PMTRI or maintenance tasks to be carried out after special events on the basis of PMTRE (see chapter 3).
  5. When defining PMTRI for Product systems in chapter 2, S4000P synergizes identified PMTRI with the Product-integrated test- and condition monitoring technology being realized more and more in modern Products.
  6. When defining PMTRI for Product structure according to S4000P chapter 2, identified maintenance task requirements are synergized with the Product-integrated structure condition monitoring technology.
  7. S4000P covers all kinds of present and future Product structural materials and material combinations.
  8. A modular analysis concept enables a zonal analysis of all types of Products to define PMTRI for Product 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 (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.
  11. S4000P chapter 3 describes the ISMO process to optimize PMTRI and consequently, the resulting scheduled maintenance tasks with intervals in the valid Product documentation.
  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 describes the data model and data exchange.
  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 in 2017 on the basis of document NATO STANREC 4795. The ISMO process remains unchanged in chapter 3 of this Issue 2.0.

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 development started at the end of 2014.
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 Germany
AIRBUS Defence & Space Spain
AIRBUS Helicopters Germany
Aviation Requirements Ltd. United Kingdom
Babcock International Group (LSC Group) United Kingdom
KCIG GmbH Germany
Logistikkommando der Bundeswehr (LogKdoBw)/p> Germany
Saab AB Sweden
Thyssenkrupp Marine Systems (tkMS) United Kingdom
UK MoD United Kingdom

Copyright and user agreement

Copyright of the specification © 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 10th September 2018