definitions, goals and objectives embry-riddle aeronautical university chapter 3

Definitions, Goals Definitions, Goals and Objectivesand Objectives

Definitions, Goals Definitions, Goals and Objectivesand Objectives

Embry-Riddle Aeronautical University

Chapter 3

Definitions, Goals, & ObjectivesDefinitions, Goals, & ObjectivesDefinitions, Goals, & ObjectivesDefinitions, Goals, & Objectives Introduction Definition of Maintenance Inherent Reliability Verification and Validation Operational and Functional Goals of a Maintenance Program Maintenance Program Objectives Summary

IntroductionIntroductionIntroductionIntroduction Address basic terms and goals and

objectives of maintenance What is Maintenance? Quantifiable measurement terms Basic objectives

FAA definition: “Maintenance is defined as the inspection,

overhaul, repair, preservation, and replacement of parts.” More of what people do vice what is to be accomplished

Definition of Maintenance

Former chief mechanic of Boeing 777 design effort: “Maintenance is the action necessary to sustain

or restore the integrity and performance of the airplane.” “…includes inspection, overhaul, repair, preservation, and replacement efforts.”


Author’s definition: “Maintenance is the process of ensuring that a

system continually performs its intended function at its designed-in level of reliability and safety.”


“Inherent reliability of an item is not the length of time it will survive with no

failures; rather it is the level of reliability the item will exhibit

when it is protected by preventive maintenance and adequate servicing and lubrication.”

Inherent Reliability

“The degree of reliability achieved depends upon design characteristics of the

equipment and the process used in determining the maintenance

requirements.”


The inherent reliability of a system or component is both a function of the design and a function of the maintenance program established for it.


Verification means that a test or procedure has

been written and that, when read and understood by a knowledgeable person, is deemed to be correct, adequate, and acceptable for the purpose for which it is intended.

Verification & Validation

Validation means that the written test or

procedure has been performed by an appropriately trained maintenance person, and the procedure, as written, is understandable, adequate, and most importantly, proven to accomplish the intended purpose.

Verification & Validation

Operational check Means to operate the equipment, system, or

component as usual (all modes and functions) and determine whether or not it is useable for its intended purpose “ task to determine if an item is fulfilling its

intended purpose.”

Operational & Functional

Functional check Means that the equipment, system,

or component has been checked out using the necessary equipment and tools to measure certain parameters for accuracy “a quantitative check to

determine if each function of an item performs within specified limits.”

Operational & Functional

1. To deliver airworthy vehicles to the flight department in time to meet the flight schedule.

2. To deliver these vehicles with all the necessary maintenance actions completed or properly deferred.

• IAW the MEL

Goals of a Maintenance Program

1. To ensure the realization of the inherent safety and reliability levels of equipment.

2. To restore safety and reliability to their inherent levels when deterioration has occurred.

Maintenance Program Objectives

3. To obtain the information necessary for adjustment and optimization of the maintenance program when these inherent levels are not met.

4. To obtain the information necessary for design improvement of those items whose inherent reliability proves inadequate.


5. To accomplish these objectives at a minimum total cost, including the costs of maintenance and the cost of residual failures.


1. A maintenance program consists of scheduled maintenance tasks to keep equipment and systems in top operating condition.

2. Unscheduled maintenance tasks to address in-service failures

3. A continuing analysis and surveillance activity to optimize the total maintenance effort by improving the maintenance program

4. Requesting a redesign of equipment5. An effort to minimize maintenance

costs


SummarySummarySummarySummary Introduction Definition of Maintenance Inherent Reliability Verification and Validation Operational and Functional Goals of a Maintenance Program Maintenance Program Objectives Summary

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definitions, goals and objectives embry-riddle aeronautical university chapter 3

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