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The instruction to "climb via SID" is used as part of the altitude portion of the clearance on certain SIDs. An S1 should have an understanding of when to use this phraseology versus the simple "maintain X thousand" wording.
None of the SIDs at HIO use this phraseology. You will use this phraseology at PDX as well as SEA.
There are two main chart items to recognize for understanding when to use this phraseology:
Top Altitude
Altitude Restrictions
TOP ALTITUDE
TOP ALTITUDE
This block is at the top of the SID chart. It may also specify a top altitude.
If it is assigned by ATC, it may be defined by an SOP or LOA.
ALTITUDE RESTRICTION
ALTITUDE RESTRICTION
This may be at any point along the route. The example here requires aircraft to cross WUREL at or above 3100 feet. The restriction may also be "at or below" or "at" a specific altitude.
NOT AN ALTITUDE RESTRICTION
NOT AN ALTITUDE RESTRICTION
This example is NOT an altitude restriction for the purposes of "climb via SID." This only tells pilots the altitude where they should change direction.
Now that you know what to look for on the charts, here are the rules for when to use what kind of phraseology as part of your clearances:
If a SID has a published top altitude and published altitude restrictions:
Use “Climb via SID.”
If a SID has a published top altitude reading "Assigned by ATC" and has published altitude restrictions:
Use “Climb via SID except maintain (altitude)”.
If a SID has a published top altitude and published altitude restrictions, but you want the aircraft to climb to a different altitude, ignoring the published altitude restrictions:
Use “Maintain XXXX”.
If a SID has a published top altitude but no published altitude restrictions:
Use “Maintain XXXX.”
If a SID has no published top altitude and no published altitude restrictions:
Use “Maintain XXXX”.
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