FAR 25.365e requires:
(e)Any structure, component or part, inside or outside a pressurized compartment, the failure of which could interfere with continued safe flight and landing, must be designed to withstand the effects of a sudden release of pressure through an opening in any compartment at any operating altitude due to:
(1)Penetration from Engine Disintegration;
(2)Any opening up to:
HO = P x AS , where,
HO = Maximum opening, need not exceed 20 Sq Ft.
AS = Maximum cross-sectional area of the pressurized shell Sq Ft; and
P = ( AS / 6240 ) + 0.024