14 CFR §23.2225

1. (a)Each engine mount and its supporting structure such that both are designed to withstand loads resulting from—
   1. (1)Powerplant operation combined with flight gust and maneuver loads; and
   2. (2)For non-reciprocating powerplants, sudden powerplant stoppage.
2. (b)Each flight control and high-lift surface, their associated system and supporting structure resulting from—
   1. (1)The inertia of each surface and mass balance attachment;
   2. (2)Flight gusts and maneuvers;
   3. (3)Pilot or automated system inputs;
   4. (4)System induced conditions, including jamming and friction; and
   5. (5)Taxi, takeoff, and landing operations on the applicable surface, including downwind taxi and gusts occurring on the applicable surface.
3. (c)A pressurized cabin resulting from the pressurization differential—
   1. (1)From zero up to the maximum relief pressure combined with gust and maneuver loads;
   2. (2)From zero up to the maximum relief pressure combined with ground and water loads if the airplane may land with the cabin pressurized; and
   3. (3)At the maximum relief pressure multiplied by 1.33, omitting all other loads.