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51-70-00
REPAIRS
51-70-10
Repairs of Reinforced Glass and Carbon Fiber Parts
This chapter gives the standard practices to repair a composite structure. A certified design
organization must prepare a special repair design for each repair. This repair design must include the
layup plans with the number of layers and their orientation.
Only approved personnel are permitted to repair composite parts. If you do not obey this
To prepare the damaged area for the repair:
1
Examine the damaged areas carefully, refer to the inspection steps in chapter 51-70-11.
2
Prepare a damage description which includes the dimensions and the depth of the
damage, refer to chapter 51-70-12. With this damage description, it will be possible to
make a decision if it is necessary to repair the damage or to replace the damaged part.
Aspects, such as reparability, costs, time, weight, aerodynamic shape and finish will also
have an effect on the decision.
3
Do the repair as given in the repair instructions from the design organization. Refer to
chapter 51-70-13 and obey the repair guidelines.
4
If necessary, prepare the surface and paint the repaired area, refer to chapter 51-70-15.
51-70-11
Damage inspection
Always do a damage inspection after an incident, when you find damage or when you think
that damage is possible.
1
Find all damaged locations of the aircraft. Look at the reflections on the surface to
find unusual curvature changes.
2
Examine each damaged location carefully.
3
Do a tap test on the damaged area and its adjacent areas to find delamination. Use
a marker or a tape and temporarily identify the areas where you found possible
damage or delamination.
Do not apply too much pressure on the surface to prevent local damage to the inner
4
At the identified locations, apply light pressure to the surface. If you hear light
cracking, the honeycomb core is possibly damaged.
5
Make a damage description, refer to chapter 51-70-12.
Page date:
25.09.2018
CAUTION
precaution, damage to the aircraft can occur.
CAUTION
honeycomb core.
Maintenance Manual XA41/XA42
AMM-XA42-0040-001 C.00
Page
11
Chapter 51
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