Part A - Maintenance Instruction Development

Chapter1. General

Type certificate applicants who have type certified aircraft in Canada have traditionally developed their scheduled maintenance instructions in accordance with either a Maintenance Review Board process (MRB), a Maintenance Type Board process (MTB) or their own internal analytical processes.

Both the MRB and the MTB analytical processes utilise the ATA MSG-3 logic as the basis for their development of initial scheduled maintenance instructions. This analytical logic is developed from the Reliability-Centred Maintenance (RCM) analytical process published by F.Stanley Nowlan and HowardF. Heap of United Airlines in 1978. Type certificate applicants for aircraft other than the transport category have traditionally utilised internally developed processes that are quite varied in approach and which may or may not have followed reliability centred maintenance principles.

Within the industry at large, the principles of reliability centred maintenance have been adapted to many different maintenance instruction development processes. The proliferation of these processes generated concerns that some maintenance instructions purported to be developed in accordance with reliability-centred maintenance principles were not in fact RCM. As a result, the Society of Automotive Engineers, published in August of 1999 the SAE Standard JA1011. It allows organisations developing maintenance instructions to assess their analytical processes and to determine if they meet the criteria to be labelled as reliability centred maintenance.

Transport Canada has assessed MSG-3 using the SAE Standard and considers that maintenance programs derived from MSG-3 conform to reliability-centred maintenance. With certain exceptions, MSG-3 has maintained the criteria necessary to be considered an analytical methodology centred on realizing the inherent safety and reliability levels of aircraft. Where MSG-3 was not shown as fully compliant with the JA1011 standard, the International Maintenance Review Board Policy Board will be used as the medium to ensure that future amendments to the analytical logic will mitigate those issues.