8 Irrevocability of powers other than powers of appointment A power, other than a power of appointment, is irrevocable unless an authority to revoke it is granted or reserved in the instrument creating the power.
New York Legal Code
8 Irrevocability of powers other than powers of appointment A power, other than a power of appointment, is irrevocable unless an authority to revoke it is granted or reserved in the instrument creating the power.