Beechcraft C-12C Operator And Technical Reference Manual page 14

TM 1-1510-218-10
when there have been extensive changes made to an
illustration.
1-11. AIRCRAFT DESIGNATION SYSTEM.
a. Example C-12C:
C – Basic mission and type symbol (Cargo)
12 – Design number
C – Series symbol
1-12. AIRCRAFT EFFECTIVITY
AND SERIALIZATION.
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.
C All C-12C aircraft.
D All C-12D aircraft.
D1 C-12D aircraft with serial numbers prior to
84-24375.
D2 C-12D aircraft with serial numbers 84-24375
and subsequent.
T All C-12T1 and C-12T2 aircraft.
T1 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.
T2 C-12T2 aircraft with serial numbers 86-60084
through 86-60089, 87-70160, and 87-70161
modified with the cockpit and digital engine
instrument upgrade.
The effectivity symbols listed are used in
conjunction with paragraph
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.
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
1-2
DESIGNATORS
titles, text content,
Where practical, to avoid
corresponding model designator(s) placed following
the paragraph or figure title.
effectivity designators are also placed within tables,
charts, and text where applicable.
designator is used if a paragraph, figure, table, or chart
is common to all models.
1-13. USE OF WORDS SHALL, SHOULD, AND
MAY.
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.
"may" is used to indicate an acceptable method of
accomplishment.
1-14. PLACARD ITEMS.
Placard items (switches, controls, etc.) are
shown throughout this manual in boldface capital
letters.
1-15. AVIONICS CHAPTERS.
This manual contains four Avionics chapters
entitled as follows.
Chapter 3 Avionics – 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
Data
Chapter 7A Performance
Data
Model and serial
No effectivity
The word
common to
C-12C C-12D1/D2,
C-12T1/T2 Aircraft
– C-12C and C-12D1
Aircraft
– C-12D2 and C-12T1/T2
Aircraft
all
and