Just to add further to Rudderrat, in PANS OPS 4 the acceleration
segment have been deleted, as once published in ICAO Doc 8168
Vol 2 in all three Editions.
ICAO Pans Ops criteria doesn't take into account the case of an
engine out. The Designers only make the procedures for the all
engines case and it's a requirement of the Operator to develop
company aircraft and airport specific engine out procedures as
Rudderrat mentioned. However Pans Ops is quite stringent as far
as obstacle clearance goes - eg the standard departure climb
gradient is 3.3% and the missed approach gradient is normally
2.5%. Most modern aircraft can accomplish these gradients even
with an engine out.
(This is also in the case of a SID, in which the procedures are
designed with a continuous climb in mind. However in any SID
there is nothing to stop a driver from arranging his flight to
include an acceleration altitude as long as its been calculated
correctly. All that has to be accomplished is that the aircraft
remains above the Procedure).