¶ Minimum Crossing Altitude (MCA)
The Minimum Crossing Altitude named MCA is the lowest altitude at which a navigational fix can be crossed when entering or continuing along an airway that will allow an aircraft to clear all obstacles while carrying out a normal climb to the required minimum en route IFR altitude (MEA) of the airway in question beyond the fix
The MCA is related with signal reception and obstacle clearance; this will be indicated by a flagged [X] on NOS and Jeppesen charts as an airway number and altitude. The pilot should climb to the MCA before reaching the intersection; in that way the MCA will not be violated.
Example: A552 12000S means route A552 should be flown at 12000 when heading south.
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