chosen for illustration the aluminum or other metal utilized to form the upper skin 25 of the particular section of the wing overlying the bay 28 may be formed into a shape such as that shown at 30 to provide a bay 31 extending into but separated from the compartment 28 the bay 31 is enclosed through the utilization of a pair of emergency doors 35 and 36 the doors 35 and 36 are hinged as shown at 37 and 38 respectively and are movable from their enclosing positions shown in solid lines in fig2 to an opened position as shown by the broken lines in fig2 when the emergency doors are closed the upper portion of the wing conforms to its original design shape further the gaps formed in the upper skin 25 of the wing by the inclusion of hinges 37 and 38 may be sealed as shown at 41 and 42 through the use of a thin aluminum deformable strip that may be secured by bonding or riveting to the upper skin 25 of the wing in this manner no aerodynamic penalty results from the inclusion of the hinged emergency doors in the top of the wing further since the strips 41 and 42 are readily deformable the doors may be opened without the requirement of undue force a tray 38 is mounted within the bay 31 and includes sides 45 and 46 as well as a bottom 48 and an.