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first entered, the cursor will be placed in the AIRPORT field (first
required field entry). The cursor will advance to the next required
field only after a valid airport entry has been made. The remaining
fields are optional and may be bypassed.
All entry fields [1R through 4R] will display dashes until an entry has
been made. After a valid airport is entered, the cursor will advance to
the RUNWAY field and the available runways for that airport
(including pilot defined) will be displayed. When a runway is
selected, the cursor will advance to the SID field. Any predefined
SIDs will be displayed at this time (if available) on the left side of the
page. The desired SID can be selected by number or a new SID can
be created by entering a new name.
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After the SID is entered, a list of enroute transitions will be displayed
if any exist. If one or more transitions are available, they will be
selectable. If none exist, the transitions may be created. The
TRANS field can also be cleared by pressing the respective line
select key while no data entries exist in that field.
This page is accessed from the PLT/SID 1/1 page by pressing the
MENU key.
DIRECTORY - Pressing this line select key displays a list of all
airports that have pilot defined SIDs associated with them.
DELETE - Pressing this line select key enables the user to delete
the selected SID.
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COPY - This function allows the user to create another SID, with a
different name, but with the same attributes as the selected SID.
These pages contain the SID procedure legs, defined in the SID
definition page. The number of pages will depend on the number of
SID procedure legs (common and transitions). This page will allow
the user to insert legs in the SID procedure. A leg can be inserted
after any of the displayed legs by pressing the respective line select
key. Similarly an existing leg can be deleted or edited. In both cases,
the Leg Path Selection page will be accessed. Page PLT/SID 3/X,
4/X and so on is similar to the second PLT/SID page.
Creating a SID
A SID is made up of one or more procedural legs. A procedural leg
is defined as a Leg Path, followed by a Leg Terminator. It is very
important to note that not all types of procedural legs can be linked
together, due to geometrical constraints and attributes of the
individual leg path/terminator combinations.
In learning how to create SIDs and STARs the pilot must learn some
new terminology, as well as understand the structures of SIDs and
STARs as defined by TERPS criteria. Also, he must understand
certain waypoint naming conventions, which are regulated under
ARINC 424 Specification, “Navigation System Data Base”. This
section will cover these and other subjects, and will take the pilot
through a detailed example of defining a SID with several runway
and enroute transitions.
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Procedural Leg Types
Most navigation systems are point-to-point navigators; that is, the
route of flight is defined by waypoint latitude/longitudes, and the
courses and distances are calculated between the waypoints. This
type of leg is called a Track-to-Fix Leg, and is only one of nineteen
ways to define a path over the earth. ARINC 424 defines the
nineteen different procedural leg types, and the FMS uses all of
them to define flight plans, SIDs, STARs and Approaches.
A Procedural Leg has two parts: a Leg Path and a Leg Terminator.
The leg path defines the path over the earth that the aircraft will fly,
and the leg terminator defines the end of that leg and the transition
point to the next procedural leg.
Three of the procedural leg types use an altitude as the terminator to
the path (Course-to-Altitude, Course-from-fix-to-Altitude, and
Heading-to-Altitude). When any of these three procedural legs is the
current TO leg, then that leg will sequence only when the altitude
constraint has been satisfied.
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All other procedural legs are terminated in other ways (i.e., a Fix, a
DME Distance, an Along Track Distance, Intercept, Radial, etc.).
When an altitude is associated with one of these terminators, the
FMS displays that altitude for information only to the pilot. No leg
sequencing or other action occurs based upon that altitude. The leg
will sequence only when the path terminator condition is satisfied
(i.e., crossing the fix, etc.).
The following list shows all of the possible procedural legs used in
　
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