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"Descend via" and "Climb via" Mexican airspace - 2007/08/03 16:43
New phraseology for “Descend
via” and “Climb via” clearances
in Mexican airspace
ASPA de Mexico advises that in an effort to improve the communication between pilots and controllers in CDA pro
cedures (Constant Descent Angle) such as the ones recently published for Mexico City and based on the experience
gained in the USA, the Mexican DGAC recently approved the following phraseology to be implemented on August
2nd.
When an Air Traffic Controller expects the Pilot to navigate on the lateral routing and altitudes as published on a
procedure (lateral and vertical navigation), he will issue a VIA clearance. The main purpose is to keep R/T short
and concise.
Arrival Example
Descent clearance with lateral/routing and vertical navigation as published in the procedure.
Descend VIA DATUL One arrival.
In this case the pilot is cleared to the lowest altitude as published in the procedure meeting all the intermediate con
straints.
Departure Example
Climb clearance with lateral/routing and vertical navigation as published in the procedure.
Climb VIA VISOS Two departure.
In this case the pilot is cleared to the highest altitude as published in the procedure meeting all the intermediate con
straints.
Arrival Examples on descent
1. Clearance with lateral/routing only as published in the procedure.
Cleared DATUL One arrival.
As is currently used
2. Clearance with lateral/routing and assigned altitude.
Cleared DATUL One arrival, descend and maintain flight level two four zero.
Cleared DATUL One arrival, maintain flight level two four zero, descend at pilots discretion.
Pilots are expected to descend to FL 240 as directed, and maintain FL 240 until cleared for further vertical navigation
with a newly assigned altitude or a descend via clearance
3. Clearance with lateral/routing and vertical navigation as published in the procedure.
Descend VIA DATUL One arrival.
Descend VIA DATUL One arrival, except, cross thirty DME fix at or above one six thousand.
I F A L P A
. . . . .
07SAB06 The Global Voice of Pilots Safety Bulletin
Pilots are expected to navigate on the trajectories and altitudes as published in the procedure. When necessary, new
altitudes constraints will be assigned; after meeting the new constraint pilots are expected to continue on the trajecto
ries and altitudes as published in the procedure.
4. Clearance with lateral/routing and vertical navigation when assigning an altitude not published on the procedure.
Descend VIA DATUL One arrival, except after thirty DME fix, descend and maintain one one thousand.
Descend via DATUL One arrival, except cross thirty DME fix, at one three thousand then descend and maintain
niner thousand seven hundred
Pilots are expected to follow the horizontal trajectories meeting the newly assigned altitude constraint in the
procedure.
5. Clearance with direct routing to intercept a FMSP and vertical navigation clearance.
Proceed direct DATUL, descend VIA DATUL One arrival.
Proceed direct DATUL, cross DATUL at or above flight level two eight zero, then descend VIA DATUL One
Arrival.
Pilots are expected to fly direct to DATUL and after crossing DATUL proceed on the trajectories and altitudes as pub
lished in the procedure. When necessary, new altitudes constraints will be assigned; after meeting the new constraint
pilots are expected to continue on the trajectories and altitudes as published in the procedure.
Departure examples on climb out
1. Clearance with lateral/routing only as published in the procedure.
Cleared VISOS Two departure.
[As is currently used]
2. Clearance with lateral/routing and assigned altitude.
Cleared VISOS Two departure, climb and maintain flight level two four zero.
Pilots are expected to climb to FL 240 as directed, and maintain FL 240 until receiving further climb clearance
3. Clearance with lateral/routing and vertical navigation as published in the procedure.
Climb VIA VISOS Two departure.
Climb VIA VISOS Two departure, except, cross VISOS at or above flight level two zero zero.
Pilots are expected to navigate on the trajectories and altitudes as published in the procedure. When necessary, new
altitudes constraints will be assigned; after meeting the new constraint pilots are expected to continue on the trajecto
ries and altitudes as published in the procedure.
4. Clearance with lateral/routing and vertical navigation when assigning an altitude not published on the procedure.
Climb via VISOS Two departure, except cross VISOS at or below two four zero then climb and maintain three
eight zero
Pilots are expected to follow the horizontal trajectories meeting the newly assigned altitude constraint in the proce
dure.
IFALPA provides this data for information only, In all cases pilots should follow their
company’s guidance and procedures.
In the interests of flight safety, reproduction of this bulletin in whole or in part is encouraged. It may not be offered for sale or used
commercially. All reprints must credit IFALPA.
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