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compass manual flight
 It’s high time to implement RNAV, using only DO236
preferred leg types: IF, TF, RF which are fixed and
without possible interpretation
 The leg type is specified at the end point : “path
terminator concept”
IF leg type
 The Initial Fix or IF Leg defines a database fix as a point
in space
 It is only required to define the beginning of a route or
procedure
TF leg type
 Track to a Fix or TF Leg defines a great circle track over
ground between two known databases fixes
 Preferred method for specification of straight legs
(course or heading can be mentioned on charts, but
designer should ensure TF leg is used for coding)
RF leg type (new leg type)
 Constant Radius Arc or RF Leg defines a constant radius
turn between two database fixes, lines tangent to the arc
and a center fix
CF leg type
 Course to a Fix or CF Leg defines a specified course to a
specific database fix
 TF legs should be used instead of CF whenever possible
to avoid magnetic variation issues
DF leg type
 Direct to a Fix or DF Leg defines an unspecified track
starting from an undefined position to a specified fix
 Procedure designers should take into account the FMS
flight path depends on initial aircraft heading as well
FA leg type
 Fix to an Altitude or FA Leg defines a specified track
over ground from a database fix to a specified altitude at
an unspecified position
FC leg type
 Track from a Fix from a Distance or FC Leg defines a
specified track over ground from a database fix for a
specific distance
FD leg type
 Track from a Fix to a DME Distance or FD Leg defines a
specified track over ground from a database fix to a
specific DME Distance which is from a specific database
DME Navaid
FM leg type
 From a Fix to a Manual termination or FM Leg defines a
specified track over ground from a database fix until
Manual termination of the leg
CA leg type
 Course to an Altitude or CA Leg defines a specified
course to a specific altitude at an unspecified position
CD leg type
 Course to a DME Distance or CD Leg defines a specified
course to a specific DME Distance which is from a
specific database DME Navaid
CI leg type
 Course to an Intercept or CI Leg defines a specified
course to intercept a subsequent leg
CR leg type
 Course to a Radial termination or CR Leg defines a
course to a specified Radial from a specific database
VOR Navaid
AF leg type
 Arc to a Fix or AF Leg defines a track over ground at
specified constant distance from a database DME Navaid
VA leg type
 Heading to an Altitude termination or VA Leg defines a
specified heading to a specific Altitude termination at an
unspecified position
VD leg type
 Heading to a DME Distance termination or VD Leg
defines a specified heading terminating at a specified
DME Distance from a specific database DME Navaid
VI leg type
 Heading to an Intercept or VI Leg defines a specified
heading to intercept the subsequent leg at an unspecified
position
VMleg type
 Heading to a Manual termination or VM Leg defines a
specified heading until a Manual termination
VR leg type
 Heading to a Radial termination or VR Leg defines a
specified heading to a specified radial from a specific
database VOR Navaid
PI leg type
 Procedure Turn or PI Leg defines a course reversal
starting at a specific database fix, includes Outbound Leg
followed by a left or right turn and 180 degree course
reversal to intercept the next leg
HA, HF, HMleg types
 Racetrack Course Reversal or HA, HF and HM Leg
Types define racetrack pattern or course reversals at a
specified database fix
HA = Altitude Termination
HF = Single circuit terminating
at the fix (base turn)
HM = Manual Termination
ARINC 424 - allowable leg transitions
* = The IF leg is coded only
when the altitude constraints at
each end of the “FX”, “HX” or
“PI” leg are different.
& = A CF/DF, DF/DF or FC/DF
sequence should only be used
when the termination of the first
leg must be over flown,
otherwise alternative coding
should be used.
# = The IF/RF combination is
only permitted at the start of the
final approach for FMS, GPS or
MLS coding and only when a
　
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