Aircraft Maintenance Handbook For Financiers

Aircraft Maintenance Handbook for Financiers

By : Shannon Ackert

1st Edition, 2018

Copyright ? 2018 Aircraft Monitor. All rights reserved.



Table of Contents

Forward ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­.¡­¡­¡­¡­¡­¡­¡­

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Sections

4

1.

Maintenance Principles ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­.¡­¡­.¡­¡­¡­¡­¡­

2.

Turbofan Design Concepts ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­.¡­¡­¡­¡­¡­¡­.. 33

3.

Turbofan Maintenance Concepts ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­..¡­¡­¡­¡­¡­¡­¡­.¡­¡­¡­¡­¡­... 45

4.

Maintenance Reserves ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­.¡­¡­¡­¡­¡­.¡­. 77

5.

Factors Influencing Maintenance Reserves ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­.¡­¡­.¡­¡­¡­¡­¡­ 102

6.

Flight©\Hour Agreements (FHAs) ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­.¡­.¡­¡­¡­¡­¡­¡­. 125

7.

Parts Manufacturer Approval (PMA) .¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­.¡­¡­¡­¡­¡­¡­¡­¡­.. 131

8.

Designated Engineering Representative (DER) Repairs ¡­¡­¡­¡­¡­¡­.¡­¡­¡­¡­¡­¡­¡­¡­¡­.. 139

Appendix A ©\ Typical Aircraft Maintenance Reserves ¡­¡­.¡­.¡­¡­¡­¡­¡­¡­¡­¡­.¡­¡­..¡­¡­¡­.¡­.. 143

References ...............¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­.¡­¡­¡­¡­¡­..¡­¡­¡­¡­¡­¡­¡­¡­.. 150

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Forward

Aircraft Maintenance Handbook for Financiers provides an introductory level description of the

principles, general practices and economic characteristics associated with aircraft maintenance. The

handbook is aimed largely for financiers and students ¨C and, indeed, anyone interested in the

underlying concepts of aircraft maintenance.

The handbook begins with an introduction into aircraft maintenance principles; highlighting the

building blocks of today¡¯s maintenance program and analyzing those concepts that influence

maintenance status and valuation. Information is assembled detailing the fundamentals of turbofan

design and maintenance concepts; a prerequisite knowledge for all involved in aircraft financing.

An in depth analysis of aircraft maintenance reserves is covered, including identifying those factors

that influence maintenance costs and time on©\wing performance. For each maintenance event,

practical exercises in calculating maintenance reserves is also included.

Principles of Flight©\Hour Agreements (FHAs), Part Manufacturer Approval (PMA), and Designated

Engineering Representative (DER) repairs are introduced to guide the readers on how these issues

impact commercial considerations.

Feedback regarding any viewpoints or discrepancies is highly encouraged. To provide feedback,

please e©\mail the author at: sackert@

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Section 1

Maintenance Principles

I. Maintenance Processes

II. Maintenance Programs

III. Maintenance Categories

IV. Maintenance Checks

V. Maintenance Packaging

VI. Maintenance Cost Elements

VII.Maintenance Utility & Status

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1.0 Maintenance Principles

? The industry definition of maintenance generally includes those tasks required to restore or

maintain an aircraft¡¯s systems, components, and structures to an airworthy condition.

Maintenance is required for three principal reasons:

A. Operational: To keep the aircraft in a serviceable and reliable condition so as to generate

revenue.

B. Value Retention: To maintain the current and future value of the aircraft by minimizing the

physical deterioration of the aircraft throughout its life.

C. Regulatory Requirements: The condition and the maintenance of commercial aircraft are

regulated by the aviation authorities of the jurisdiction in which the aircraft is registered.

Such requirements establish standards for repair, periodic overhauls, and alteration by

requiring that the owner or operator establish an airworthiness maintenance and inspection

program to be carried out by certified individuals qualified to issue an airworthiness

certificate.

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