8 August 2012

SLAT (Repair)

On our previous checks, our advisor, Mr Ashok, EAA (M) members have found some dents on the right Wing Outboard Slat. There are two spots that are around the first rivet and second rivet, both at the middle of the Slat. So, we decided to make a skin repair on it. We have placed the Slat on the single wood horizontally positioned with the Slat and covered with cloth rag. Then, both are supported with two woods (blue covered wood).

Then, 2 rachet strap is used to maintain the shape of the Slat. The strap is carefully tighten, and covered with woods on the top and at the leading edge of the Slat.

With a #30 drill bit, carefully drill off the rivet head by turning the rivet by hand. Then, the drill is used to push the remainder of the rivet out by turning the drill by hand.

In the picture, it is shown that some dented are visible around the hole.

With a rounded shape wood, we then pushed the skin lightly and repeatedly to smoothen the dents. The bottom of the skins is supported by the Slat airfoil (75S-1-1). The dent is better than before after the operation. The hole is then clecoed with #30 cleco.

Then, we started to drill out first blind rivet using a #30 drill bit and turns by hand.

After the rivet head is drilled off, the remainder of the rivet is pushed out by turning and push the drill into the remainder. As we know, the airfoil Slat is thin, so we carefully done the operation.

We have marked the dent by circling it with a marker pen. With a hot gun, slowly we heat up the dented area.

With a rounded shape wood, we then pushed the dented skin lightly and repeatedly to smoothen the dents. The operation is done repeatedly until the dent is smoothen. The operation is also done to the skin around the first hole.

In this picture, we can see that the dent is smoothed.

Both holes are checked for the Acceptable Tolerance and it is shown that the holes is on the Max Acceptable Tolerance that is 3.5mm.

Both holes are then riveted with A4 rivets. On the second hole, the black colour around the rivet is a colour marks from the rounded shape.