General; Assignment Of Subject Material; Application; Effectivity - Piper Cheyenne IIIA Airplane Maintenance Manual

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
B. Assignment of Subject Material
Each chapter, including the Introduction section to the manual, are marked with a yellow plasticized
tab divider. For ease of reference, these dividers shall be staggered.
The content of this publication is organized at three levels. The three levels are:
1. System/Chapter - The various groups are broken down into major systems such as Environmental
Systems, Electrical Power, Landing Gear, etc. The systems are arranged more or less
alphabetically rather than by precedence or importance. They are assigned a number, which
becomes the first element of the standardized numbering system. Thus, the element "28" of the
number 28-40-01 refers to the chapter "Fuel". Everything concerning the fuel system will be
covered in this chapter.
2. Sub-System/Section - The major systems/chapters
of an airplane are broken down into
subsystems. These sub-systems are identified by the second element of the standard numbering
system. The element "40" of the number 28-40-01 concerns itself with the indicating section of the
fuel system.
3. Unit/Subject - The individual units within a sub-system/section
may be identified by the third
element of the standard numbering system. The element "01" of the number 28-40-01 is a subject
designator. This element is assigned at the option of the manufacturer and may or may not be
used.
C. Application
Any publication conforming to the ATA format will use the same basic numbering system. A person
wishing information concerning the indication portion of the fuel system, would refer to the
System/Chapter Tab 28-Fuel. The table of contents in the front of this chapter will provide a list of sub-
systems covered in this chapter. For example, the fuel system chapter with a full index would contain:
28-00 General
28-10 Storage (Tanks, cells, necks, caps, etc.)
28-20 Distribution (Fuel lines, pumps, valves, controls, etc.)
28-30 Dump (If in-flight dumping system is installed)
28-40 Indicating (Quantity, temperature, pressure, etc.)
Refer to the table of contents for a complete breakdown and list of the System/Chapters. The material
is arranged in ascending numerical sequence.
D. Effectivity
The Log of Effective Revisions following the title page of the manual lists the revisions currently
effective for the manual.
EFFECTIVITY:
040-999
Jan 10/90INTRODUCTION