1 | Check the flatness of the stringer flange (1) with the aid of a square and a feeler gauge. |
The stringer flange should not exceed 0.3 mm of warpage, dimension "A", for each 100 mm of length, dimension "X". If the value is not within the specified value, the stringer should be aligned. |
Alignment diagram: |
- (1) side member flap |
- (2) Square |
- (3) Device for aligning the side member flap |
- (4) Wood shim |
2 | Fit the device (3) on the stringer flange (1). Force the flange up or down as required. To do so, use the lever formed by the alignment device (3) |
If necessary, use a wooden shim (4) to support the stringer flange. At every operation, make sure that the device (3) is correctly positioned. |
3 | Double check the flatness of the stringer flange (1). |
If the value is not within the specifications, repeat the procedure from step 2. |
B31.30-0009-11