Chapter4. MTB Report (MTBR)
The MTBR contains the scheduled maintenance instructions necessary for a transport category aircraft when the aircraft is type certified. MTBRs are “living” documents, which must be reviewed and amended periodically to ensure that they reflect the current “lessons learned” from aircraft operational experience. In this manner the continuing airworthiness of an aircraft fleet is ensured and only those tasks that are applicable and effective are performed.
b) MTBR Review and Approval
The type certificate applicant is responsible for developing a proposed MTBR and presenting it to TCCA for approval. The MTBR format and content criteria should be aligned with the criteria used for the MRBR as found in Appendix1. Once approved, the type certificate holder publishes the MTBR as part of the aircraft’s Instructions for Continued Airworthiness. It is a means of complying in part with the maintenance instruction requirements of AppendixH to Chapter525, and 529 of the Airworthiness Manual and for developing the Instructions for Continued Airworthiness, as required by 525.1529 and 529.1529.
The MTBR must be approved by TCCA prior to becoming available for use by Canadian operators, as must all subsequent changes.
c) Non-Approval of Proposed MTB Reports or MTBR Revisions
The MTB Chairperson shall notify the type certificate applicant in writing, of the non-approval of the MTBR or of any subsequent revision. The letter shall include the specific reason(s) for the non-approval.
d) Publication of the MTBR
When an MTBR has been produced, the type certificate holder will publish it as part of the Instructions for Continued Airworthiness (ICAs) for the aircraft.
e) MTBR Annual Review
The MTBR is intended to be an up-to-date document and, as a consequence the manufacturer and the MTB Chairperson must conduct a joint review, at least annually, to determine the need for revisions. Results of these reviews are to be documented by the MTB Chairperson for inclusion in the MTB historical file.
The manufacturer and the MTB will convene and evaluate proposed changes to the MTBR. Proposed changes are submitted, with supporting data, to the MTB Chairperson. Approval or non-approval of the proposed changes shall be processed in the same manner as outlined for the initial MTBR approval/non-approval.
f) The “Living MTB” Concept
Prior to approval of the MTBR, the type certificate applicant must develop an auditable system14 for the continuing analysis of all tasks included within the MTBR, or show that the intent of the following is being met by the end users of the MRBR. As part of the continuing analysis system the manufacturer must provide the following;
- A system for acquiring from operators reports related to adequacy of tasks, failures, failure frequencies and the consequence of the failures;
- An age-exploration system for the continuous evaluation of age-condition information for the substantiation of current task intervals, the adjustment of task intervals, and the identification of new tasks;
- A system for controlling the addition of new scheduled tasks to ensure that they meet RCM criteria before they are accepted;
- A system for the periodic evaluation of all tasks in the program to eliminate those which are no longer needed;
- A system for evaluating unanticipated problems and determining the appropriate action.
g) Sampling Inspections (In support of Age Exploration and MTBR Evolution)
For aircraft and engines where a manufacturer conducts discretionary or required sampling/analytical inspections in support of age exploration and MTBR evolution, the following procedures apply:
- The manufacturer/air operator shall notify TCCA in a timely manner, of the time and place of the inspection, in order to permit regulatory authority participation. Where regulatory authority attendance is not possible, the manufacturer/air operator must provide to the regulatory authority a copy of the inspection report including supporting documentation and any associated analysis, which was conducted to justify the conclusions of the report.
- Subsequent to completion of any requisite sampling inspections of a complete product or module further regulatory authority participation will be determined on a case-by-case basis.
NOTE: The TCCA office responsible for co-ordinating regulatory authority attendance at opportunity and required inspections will be the Superintendent, Aircraft Evaluation Group, Aircraft Maintenance and Manufacturing Branch, Ottawa.
14 ref AppendixA, SectA4, P367, RCM Nowlan&Heap