when there have been extensive changes made to an
1-11. AIRCRAFT DESIGNATION SYSTEM.
a. Example C-12C:
Basic mission and type symbol (Cargo)
The aircraft effectivity for content within this
manual will be designated by the following symbols: C,
D, D1, D2, T, T1, and T2. These symbols may be
used individually or in groups.
All C-12C aircraft.
All C-12D aircraft.
C-12D aircraft with serial numbers prior to
C-12D aircraft with serial numbers 84-24375
All C-12T1 and C-12T2 aircraft.
C-12T1 aircraft with serial numbers 85-51262
through 85-51268 and 85-51270 through
85-51272 modified with the cockpit and digital
engine instrument upgrade.
C-12T2 aircraft with serial numbers 86-60084
through 86-60089, 87-70160, and 87-70161
modified with the cockpit and digital engine
The effectivity symbols listed are used in
performance charts and graphs, tables, figure titles,
and specific items on illustrations to show proper
effectivity of the material as applicable. If the material
applies to all models within the manual, no effectivity
designators are used. Where practical, to avoid
duplication, descriptive information is written to apply
to all models and split series effectivities. Table 2-1
lists the most significant differences between models
including the split series effectivities.
Aircraft serial numbers are used only where
needed for clarification. Paragraphs, figures, tables,
and charts that apply to specific model(s) have the
corresponding model designator(s) placed following
the paragraph or figure title. Model and serial
effectivity designators are also placed within tables,
charts, and text where applicable. No effectivity
designator is used if a paragraph, figure, table, or chart
is common to all models.
1-13. USE OF WORDS SHALL, SHOULD, AND
Within this technical manual, the word "shall" is
used to indicate a mandatory requirement. The word
"should" is used to indicate a nonmandatory, but
preferred, method of accomplishment. The word
"may" is used to indicate an acceptable method of
1-14. PLACARD ITEMS.
Placard items (switches, controls, etc.) are
shown throughout this manual in boldface capital
1-15. AVIONICS CHAPTERS.
This manual contains four Avionics chapters
entitled as follows.
Chapter 3 Avionics
Chapter 3A Avionics C-12C and C-12D1 Aircraft
Chapter 3B Avionics C-12D2 Aircraft
Chapter 3C Avionics C-12T1/T2 Aircraft
1-16. PERFORMANCE CHARTS/GRAPHS.
This manual contains two performance data
chapters entitled as follows.
Chapter 7 Performance
Chapter 7A Performance
C-12D2 and C-12T1/T2