Appendix 1 - Recommended MRBR Format and Content

Each MRBR should be entitled "Maintenance Review Board Report (MRBR), Manufacturer Name, Aircraft Model#," and at a minimum, should contain the following, as appropriate:

d) A Revision Log.

e) A List of Effective Pages (including the revision status and corresponding dates).

f) A Title Page (containing the title of the MRBR and the report number, if any).

g) A Table of Contents.

h) An Approval Page (containing the following statements):

"This report outlines the initial minimum scheduled maintenance/inspection requirements to be used in the development of an approved continuous airworthiness maintenance program for the airframe, engines, systems, and components of the (aircraft make, model, and series)."

"The requirements in the report have been developed using (insert the name of the analytical decision logic utilised) decision logic, or an alternative procedure as agreed upon by TC, ISC, WG, etc."

"Transport Canada (TC) hereby approves the use of this report by TC-certified air operators of the (aircraft make, model, and series)."

  Signed: Date:___________
  (Title of approving official)  
  (Insert page(s) for other regulatory authority approval, if applicable)

i) An ISC/MRB Personnel Listing (including ISC/MRB personnel, their organisational affiliation, and the capacity in which they serve).

j) The MRBR Preamble (The following information should be included in the Preamble of each MRBR):

"This report outlines the initial minimum scheduled maintenance/inspection requirements to be used in the development of an approved continuous airworthiness maintenance program for the airframe, engines, systems, and components of (aircraft make, model, and series). These MRB requirements are a basis from which each air operator develops its own continuous airworthiness maintenance program."

"The responsible TCCA inspector shall ascertain that all of the applicable scheduled maintenance/inspection requirements in this report are included in the air operator's initial continuous airworthiness maintenance program."

k) Acronyms

All acronyms used in the MRBR should be defined. A listing of acronyms that should be contained in the MRBR are provided in this Appendix.

l) Definitions

Definitions of technical terms should be included in the MRBR. The use of industry accepted definitions, such as those found in the analytical logic being used and in the World Airlines Technical Operations Glossary should be used whenever possible.

m) Applicability

The MRBR must identify the specific aircraft make, model, and series, and the standard options. New options will be added to the MRBR summary sheets.

n) Tasks and Frequencies

All tasks and their frequencies shall be identified in the MRBR.

Further guidance may also be provided in the MRBR regarding the means to adjust the scheduled inspection/maintenance intervals currently provided for in the MRBR. This guidance will be unique to the aircraft.

Escalation guidance should take into consideration the content of like checks and their repetitive intervals. A series or sequence of specified checks must be completed, and the results found satisfactory, before escalation of that type of check. Procedures should be included here for the air operator to advise the manufacturer and for the manufacturer to advise the regulatory authority of any instances in which unscheduled maintenance is carried out prior to an inspection interval being reached or of situations where inspections are being conducted prior to their MRB task intervals being reached.

A description of the types of checks, and their intervals, should be included in this section of the MRBR.

o) Maintenance Program Rules

The following rules should be contained in the MRBR:

If there is an escalation procedure contained in the MRBR, the following rule applies: "The individual check intervals listed in this report may be escalated following the completion of the required series or sequence of checks and the satisfactory review of check results and approval by the appropriate regulatory authority, or in accordance with (IAW) the air operator's approved reliability program."

Individual task intervals may be escalated based on satisfactory substantiation by the air operator, and review and approval by its appropriate regulatory authority, or IAW the air operator's approved reliability program.

Service Bulletins may be referenced by number in this report for clarifying the procedural aspects of this program; however, they shall not be used for escalation purposes.

Task interval parameters expressed in the MRBR may be converted to an individual air operator's desired units, provided this conversion does not result in the air operator exceeding the initial requirements of the MRBR.

The use of non-destructive inspection (NDI) methods, such as X-ray, ultrasonic, eddy current and radio isotope, which are approved by the manufacturer, can provide an alternative to the methods prescribed in this report. Each air operator should notify its regulatory authority of the use of an acceptable alternative method.

Within this report, the terms "check" and "inspection" are not intended to imply a level of skill required to accomplish a task.

Life-limited parts must be retired IAW the limits established in the engine or aircraft Type Certificate Data Sheets (TCDS) or the Airworthiness Limitations section of the engine or aircraft manufacturer's Instructions for Continued Airworthiness.

After the accumulation of industry service experience, the ISC or MRB Chairpersons may request changes to the requirements of this MRBR.

p) System/Powerplant program rules

The following are recommended contents of the System Program Rules section of the MRBR:

" Specify the analytical logic used, and its revision status, to develop a scheduled maintenance program. With the exception of life-limited parts, this process does not normally include detailed off-wing shop maintenance procedures. Off-wing detailed procedures are controlled by individual air operators and are IAW the manufacturer's Instructions for Continued Airworthiness required by the Regulations.

Maintenance Significant Items (MSIs)

Insert the list of MSIs.

All MSIs identified by the manufacturer have been subjected to the analytical logic process. This process has resulted in the identification of maintenance tasks that are contained in this report. Those MSIs for which a task was not generated during the analysis are identified as follows:

(Insert: MSI listing for which no tasks were identified.)

q) Structural Program Rules

Structural inspection programs (SIPs) are developed by the aircraft manufacturer to meet the inspection requirements for damage tolerance. The types of damage considered during program development are environmental deterioration (ED) (corrosion, stress corrosion), accidental damage (AD), and fatigue damage (FD). Some forms of ED are age related; therefore, inspections for this type of deterioration are controlled by calendar intervals. These calendar inspections, plus the requirements for detecting other types of ED, and accidental and fatigue damage (FD), are contained in the SIP. The following are recommended contents of the structural program rules section of the MRBR:

"All aircraft in an air operator's or group of air operator's fleets shall be subject to the provisions of this report. These requirements include external and internal inspections, structural sampling and age-exploration programs, Corrosion Prevention and Control Programs, and additional supplemental structural inspections that may be required for fatigue-related items. A reliability program shall not be used to escalate the inspection interval, or delete the task, on any structural inspection item listed in the Airworthiness Limitations section. Initial check intervals for the SIP are expressed in calendar time, flight cycles, or flight hours. No repeat inspection intervals shall be escalated until at least one aircraft in an air operator's fleet has been inspected within the initially defined intervals listed in the MRBR.

Structural inspection limitations listed in the aircraft manufacturer's Airworthiness Limitations section will be referenced in the MRBR by document number."

(Insert SSI sheets.)

r) Zonal Program Rules

The Zonal Inspection Program (ZIP) provides consolidation of a number of general visual inspection (GVI) tasks for each zone. A zonal inspection may include GVI tasks derived from MSIs and SSIs. An MSI/SSI task that is in the ZIP must be cross-referenced, in the supporting documentation, as a zonal item; likewise, the zonal item must be cross referenced as an MSI/SSI task to ensure content and accountability. No Safety Route (5 or 8) tasks are to be candidates for zonal programs. The following are recommended contents of the Zonal Program Rules section of the MRBR:

The ZIP contains a series of GVI tasks. Detailed inspections (DIs) and special detailed inspections (SDIs) are not to be contained in the ZIP. Zonal inspection requirements apply only to zones.

Access to zones should be easily accomplished and should not require the use of special tools. Normally, the inspection aids to be used are a flashlight and/or inspection mirror. The entire visible contents of the zone must be inspected for obvious damage, security of installation, and general condition, including corrosion and leaks.

The following zones do not contain system installations but receive adequate surveillance from other maintenance or structural inspections tasks. Accordingly, these zones are not specified in the inspection requirements presented in the ZIP.

(Insert listing of the zones not specified in the ZIP.)

(Insert zonal inspection sheets.)

s) Appendixes.

  • Aircraft zones.
  • National regulatory differences, as mandated by other regulatory authorities. (Each shall be accepted by the respective authority.)
  • Acronyms.
  • Definitions.
  • Other, as applicable.
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