finishes and coverings 2
What paperwork must be completed if an aircraft originally covered in cotton is recovered in polyester?
A 337.
What type of hand sewing stitch is used when repairing a tear in aircraft fabric?
A baseball stitch.
What should be applied to rib caps that are not rounded and smooth?
Anti-chafe tape.
Where can mechanics find instructions about tying the correct knots during the rib lacing process?
Both STC's and AC 43.13
Which of the following repairs require sewing?
Cotton fabric repairs.
How often should a hand sewing stitch be locked when repairing a tear?
Every 10 stitches
Which seam is the strongest?
French Fell
Which of the following fabrics are no longer available?
Grade A cotton.
When lacing fabric to a wing rib, what is the spacing for the first stitch?
Half the required lace spacing for the rest of the rib.
Which of the following is NOT an FAA approved method of testing wing fabric.
IA visual and NDT Inspection Methods.
What determines the spacing of rib lacing stitches on a fabric covered wing?
The never-exceed speed of the aircraft/
Finishing tape (surface tape) is used for what purpose?
To provide additional wear resistance over the edges of fabric forming structures.
The determining factor(s) for the selection of the correct weight of textile fabric to be used in covering any type of aircraft is the
Vne and the maximum wing loading.
Which tape is already pre-shrunk?
Surface tape.
How much does polyester shrink at 350 degrees F?
10 %
Critical airflow areas such as the leading edge require how many inches of overlap at the seam?
2 - 4
Aircraft fabric is allowed to deteriorate to what percentage of its original strength?
70 %
What type of knot is used when lacing the ribs on a fabric covered aircraft?
Modified Seine knot.
What additive increases the overall flexibility and life of a coating?
Rejuvenator.
Any protrusions in the fabric covering are reinforced with
gussets.
