Text in force at CS27-10: from CS27-0, effective 14 Nov 2003.
(a) There must be a positive, quick-acting valve to shut-off fuel to each engine individually.
(b) The control for this valve must be within easy reach of appropriate crew members.
(c) Where there is more than one source of fuel supply there must be means for independent feeding from each source.
(d) No shut-off valve may be on the engine side of any firewall.
ED Decision 2003/015/RM · Source