Securing thrust reverser cowling.

A thrust reverser structure (12A, 12B) for a gas turbine engine (10), the structure comprising an outer structure (16A, 16B) and an inner structure (24A, 24B), the structure is capable of being secured in a closed position via outer fastening members (20, 22) on the outer structure (16A, 16B), characterised in that the structure is capable of being further secured on the inner structure (24A, 24B) via a securing device (34) having a securing position and first and second release arrangements (52, 58), each release arrangement being operable to release the securing device (34) to a non-securing position.