Text in force at CS23-6: from CS23-5, effective 15 Aug 2017.
(a) The applicant must determine, as applicable, climb and/or descent performance:
(1) for all engines operating;
(2) following a critical loss of thrust on take-off; and
(3) after a critical loss of thrust, during the en route phase of flight.
ED Decision 2017/013/R · Source