Using the quote, what do you do when the MAPSC is equal to or less than 19?
The qualification of the requirement for two pilots implies single pilot in the alternative case. This is true for single pilot IFR as well as single pilot VFR (in the text quoted).
All of these clauses are preceded by one which states:
JAR-OPS 3.940 (a)(1) The composition of the flight crew and the number of flight crew members at designated crew stations are both in compliance with, and no less than the minimum specified in, the Helicopter Flight Manual.
Jim