Calculate opening holes as per FAR 25.365e

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