Air delivery lock for a cargo located in an aircraft and a restraint system

An air delivery system, comprising:

• at least a pair of parallel guide rails for carrying cargo pallets, which guide rails are extendable along a longitudinal axis of an aircraft;
• and
• at least one air delivery lock, the air delivery lock comprising:
• a housing;
• a restraining device having an engagement end for contacting and restraining the cargo pallet, and a force reaction end;
• a bell crank having a bell crank joint for swivably mounting the bell crank;
• an elastically deformable force introduction unit;
• and
• a latching unit;
• wherein the restraining device is swivably mounted on a first leg of the bell crank around a restraining device axis;
• wherein the force introduction unit is attached to a second leg of the bell crank and the force reaction end of the restraining device;
• wherein the latching unit comprises a first guide means and a second guide means;
• wherein the first guide means is attached to a structurally fixed point of the housing and the second guide means is attached to the restraining device;
• wherein the first guide means, the second guide means, the restraining device, the bell crank and the force introduction unit are designed that the first guide means allows a rotation of the restraining device around the restraining device axis, thereby deforming the force introduction unit, and prevents a rotation of the bell crank by limiting the motion of the second guide means, if the force acting on the engagement end is below a predetermined release force, and that the first guide means releases the second guide means if the force acting on the engagement end equals or exceeds the predetermined release force, thereby allowing the bell crank to rotate.