Injectable rib foot cleat

A method for sealing around a stringer passing through a rib mouse hole in an aircraft assembly, comprising:

• providing a rib and a stringer extending through a mouse hole of the rib;
• arranging a rib foot cleat over the stringer;
• attaching the rib foot cleat to the rib, wherein the rib foot cleat includes a cleat channel that is U-shaped in cross section and terminates at a first channel opening rim on first end of the rib foot cleat and at a second channel opening rim at a second end of the rib foot cleat opposite the first end,;
• injecting sealant through an injection hole in the rib foot cleat to fill a gap between the cleat channel and the stringer with sealant to seal the gap, and
• confining the sealant to the gap by the cleat channel and the stringer by at least one channel lip extending beyond an interior surface of the cleat channel towards the stringer and extending at least partially around the interior surface defining the cleat channel, wherein the at least one channel lip is adjacent the first and/or second channel opening rim.

A tool for forming a lip on a rib foot cleat having a cleat body defining a cleat channel configured to be arranged over a stringer, and an attachment flange for attaching the cleat body to a rib, wherein the cleat channel includes a U-shaped inner surface that terminates at a first channel opening rim on one side of the cleat body and at a second channel opening rim on an opposite side of the cleat body, the tool comprising:

• a tool body including a U-shaped outer surface configured to be placed against the U-shaped inner surface of the cleat channel of the rib foot cleat, wherein tool body having at least one recess in the U-shaped outer surface and the at least one recess extends at least partially around the U-shaped outer surface,
• wherein, while the tool body is seated on the U-shaped outer surface, the at least one recess is aligned with the U-shaped inner surface of the cleat channel is aligned adjacent the first channel opening rim and/or the second channel opening rim;
• and
• a locating feature for aligning the tool body against the cleat body of the rib foot cleat.