Industry Steering Committee (ISC) Role

A team composed of delegates from:

The proposed or actual operators

Manufacturers (do not “own” the process)

Regulators - typically chair the process

The activities of the ISC are to essentially follow Advisory Circular AC 121-22A, based on:

Use of ATA MSG 3 methodology to develop the scheduled maintenance program for a given aircraft systems structure and engines.

The ISC, is tasked with:

Developing and establishing the policy for the development of the MRBR proposal.

Participation in the review and approval process of the ISC.

The document is termed the Policy and Procedures Handbook (PPH).

What is the Maintenance Review Board (MRB)?

A group led by the Airworthiness Authority determines, by the issue of an MRB Report, the principles that should be applied to the development of a Maintenance Programme for an aircraft type or aircraft engine type.

Throughout the life of the aircraft, further MRB Reports are issued as necessary to ensure that approved maintenance regimes continue to take full account of aircraft modifications and variants.

MRB Working Groups following the instructions of the ISC and the process prescribed by MSG3

MRB delivers a completed document which is known as the Maintenance Review Board Report (MRBR).

The “MRB process” consists of all the activities performed to produce, review, accept, and amend the Maintenance Review Board Report (MRBR).

The MRBR contains the minimum scheduled maintenance requirements for derivative or newly typed certified aircraft (Aeroplanes and Rotorcraft).

The MRBR is included within an aircraft’s ICAs & meets part of the requirements of: CS 25

The initial MRB report for any new aircraft is developed essentially in the absence of actual in-service experience.

As a result, the tendency is to be conservative in the decision-making process.

As service experience is accumulated, task intervals (thresholds/repeats) should be adjusted to reflect the results of actual in-service data.

The MRBR is used as the source document for the MPD.

What is the Maintenance Planning Document (MPD)?

A document that defines all tasks related to the performance of maintenance for a given aircraft.

It provides the information needed to define the AMP.

MPDs are “task-driven” because of it:

Refers to all maintenance tasks, identified by reference of accomplishment DATA and associates to relevant deadlines in terms of flight cycles, flight hours, or calendar days.

The Maintenance Planning Document (MPD) contains:

All the MRB requirements.

Mandatory scheduled maintenance requirements.

What does the MPD identify?

In simple terms:

Relevant planning Information for the accomplishment of aircraft maintenance.

Example: Tasks, Manhours, and Required Skills.

After analysis & “proof of concept” in terms of reliability data, it is quite common for MRBR tasks to receive interval escalation in AMPs.

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