A cowl door (34; 36) comprising: a cowl door body having a first side , a second side , and an interior surface and an exterior surface extending between the first side and the second side , the cowl door body configured to be rotatably mounted to a structure (24; 32) at the first side of the cowl door body ; at least one stiffener mounted to the interior surface of the cowl door body and extending lengthwise at least a portion of a distance (D) between the first side and the second side of the cowl door body , the at least one stiffener comprising a stiffener body comprising a latch housing section disposed at a second stiffener end of the stiffener body proximate the second side of the cowl door body ; and a latch member mounted to the stiffener body and disposed at least partially within the latch housing section of the stiffener body , wherein the at least one stiffener is configured as a hoop stiffener , wherein the stiffener body further comprises a mount portion mounted to the interior surface of the cowl door body and a hoop portion projecting outward from the mount portion , wherein the stiffener body has a first stiffener end opposite the second stiffener end , characterised in that the stiffener body further comprises a support section that extends from the first stiffener end a portion of a length (L) of the stiffener body and the latch housing section extends from the second stiffener end another portion of the length (L) of the stiffener body , and wherein the hoop portion of the stiffener body has a first width (W2) at the latch housing section and a second width (W3) at the support section , different than the first width (W2). a cowl door body having a first side , a second side , and an interior surface and an exterior surface extending between the first side and the second side , the cowl door body configured to be rotatably mounted to a structure (24; 32) at the first side of the cowl door body ; at least one stiffener mounted to the interior surface of the cowl door body and extending lengthwise at least a portion of a distance (D) between the first side and the second side of the cowl door body , the at least one stiffener comprising a stiffener body comprising a latch housing section disposed at a second stiffener end of the stiffener body proximate the second side of the cowl door body ; and a latch member mounted to the stiffener body and disposed at least partially within the latch housing section of the stiffener body , wherein the at least one stiffener is configured as a hoop stiffener , wherein the stiffener body further comprises a mount portion mounted to the interior surface of the cowl door body and a hoop portion projecting outward from the mount portion , wherein the stiffener body has a first stiffener end opposite the second stiffener end , characterised in that the stiffener body further comprises a support section that extends from the first stiffener end a portion of a length (L) of the stiffener body and the latch housing section extends from the second stiffener end another portion of the length (L) of the stiffener body , and wherein the hoop portion of the stiffener body has a first width (W2) at the latch housing section and a second width (W3) at the support section , different than the first width (W2). <EOS>