New York Consolidated Laws, Estates, Powers and Trusts Law - EPT § 10-9.1 Revocability of a power of appointment

(a) A power of appointment is irrevocable unless the donor reserves the right to revoke it.

(b) An exercise of power of appointment is irrevocable whenever:

(c) If the donee in exercising a power reserves a power to revoke the appointment, but does not expressly reserve a power to reappoint, upon the exercise of the power of revocation, the donee can reappoint.

(d) An instrument exercising a power of appointment is affected by fraud in the same manner as a deed or will, executed by an owner or by a trustee of property.