January 16, 2012

Log book - PA-14

Identify the product's condition during it's life time

A. Scope

Further to its acceptance and its delivery to the higher level, the product continues to evolve.

Whatever the changes made to the product, the various parties need to know about them so that the product can be correctly followed up.

Therefore, during the higher level integration, test and utilisation phases, everything that happens to the product shall be recorded in order to guarantee the traceability of the changes.

All this information is recorded in the Log Book (LS), a document that accompanies the product from its acceptance to its in-flight acceptance testing phase.

The Log Book is a means of knowing, at any moment in time after acceptance, the real state of the product.

It is an experience feedback tool.

The Log Book (LS) is based on the RNC document "RNC CNES Q HB-20 511 Contenu type du Livret Suiveur (LS)".

B. Principles of preparation

By definition, the Log Book of the product is open after its acceptance by the higher level.

Established and initiated by the supplier of the product, it is given to the higher level at the time of delivery.

From that time onwards, the higher level is responsible for systematically completing it throughout the period during which it is used, during the integration and test phases and through to the in-flight acceptance testing.

The Log Book contains the information concerning the changes made, the operation, the maintenance operations and the failures observed. It usually includes the following:

  • presentation;
  • table of limited lifetime items;
  • record of non-flight elements;
  • record of connector coupling / uncoupling operations;
  • record of events (including the operating times, the anomalies observed, etc.).


C. Typical content

1. Presentation

This states:

  • the reference number of the document (established according to the documentation management rules);
  • the designation of the product (with the product Tree Number, if applicable);
  • the type of model (EM, MV, etc.);
  • the reference number of the Delivery Inspection Report (RCI) and its date of approval;
  • the Definition File reference number;
  • the Technical Specification reference number;
  • the higher level organisation and the reference number of the contract, if there is one.


2. Table of limited lifetime items

This consists of the list of all the life-limited elements whose characteristics have a direct influence on the safety criteria and on the function of the product.

3. Record table of connector coupling / uncoupling operations

This table identifies the connectors individually and mentions, for each one, the dates of assembly and disassembly and the successive inspections, in order to ensure that the number of operations does not exceed the specified values.

4. Record table of non-flight elements

This table contains the record of the protection components (plugs, warning flags, etc.) and their locations and dates of installation and removal.

5. Record table of events

This table lists the various events that have affected the product: transport, storage, utilisation, technical operations, verification, repair, modifications, tests, checks, anomalies, concessions, integration, etc.

The following are stated for each event:

  • the date,
  • the parameters obtained,
  • the reference document,
  • the observations and the signature of the supervisor.


In these tests (or inspections), the nature of the test and the references of the procedure and test report shall be specified.

The list of ground facilities used shall also be recorded. The table includes the following columns: sequence number, identification of the ground facility, reference, trailer document, comments.

Furthermore, each energisation of the product shall be mentioned with its date, its duration, the description of the operation and the signature of its supervisor.

A Log Book form is provided, see PAF 13.


RisksLack of knowledge of changes to product after delivery
Log Book (LS)



Activities / documentation

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