Aircraft wing assembly

An aircraft wing assembly, comprising:

• a fixed wing and a wing tip device at the tip thereof, wherein the wing tip device is configurable between:
• (i) a flight configuration for use during flight and (ii) a ground configuration for use during ground-based operations, in which ground configuration the wing tip device is rotated away from the flight configuration about a hinge axis such that the span of the aircraft wing assembly is reduced, and
• the fixed wing comprises a fixed wing lug, the wing tip device comprises a wing tip lug, and the wing assembly further comprises a locking pin,
• wherein in the flight configuration the fixed wing lug and wing tip device lug are aligned such that the locking pin may be inserted through the fixed wing lug and wing tip device lug into a locking position to lock the wing tip device in the flight configuration,
• wherein the locking pin is hollow and comprises a heating element.