29 Questions
What is the primary reason for thermal variations in the repair area?
Material type
Why is it important to know the structural composition of the area to be repaired?
To choose the correct repair technique
What happens if the temperature of the thermocouple varies more than 10 degrees from average during the thermal survey?
Add more insulation
Why do stringer and rib areas in the repair zone have lower temperatures than the middle of the patch?
They act as a heat sink
What can be done to address heat sink problems in the repair area?
Add more insulation
How does the thickness of skin sections affect heating during repairs?
Thick skins easily overheat
What is the main disadvantage of using the described press method?
It only applies pressure in one direction.
What is the typical range of rapid forming times mentioned in the text?
10 minutes - 2 hours
What is a thermocouple used for?
To measure temperatures
How is an electric current produced in a thermocouple?
By joining dissimilar metals
Which type of insulation is recommended for higher cure temperatures when using TC wire?
Kapton-insulated wire
Why is thermocouple placement important in repair processes?
To ensure proper cure temperatures
What is one of the drawbacks of using a scarf joint for bonded repairs?
A large quantity of material must be removed to maintain a small taper angle.
Why is it important to have better trained personnel for bonded repairs compared to bolted repairs?
Bonded repairs involve more complex procedures like laying up replacement plies accurately.
What can happen if replacement plies are not cured in an autoclave during a repair?
The strength of the repair joint may be significantly reduced.
Why is the patch precured and then secondarily bonded to the parent material in some repair methods?
To closely approximate a bolted repair.
In what situation would a repair using a scarf joint typically be performed?
When the part is lightly loaded.
What should be applied after the patch has cured?
Conducting mesh and finish coat
Why are trailing edges of control panels highly vulnerable to damage?
Because of their susceptibility to lightning strikes and ground collision
What is a typical disadvantage of resin injection repairs?
Drilling holes causes damage to the fibers
What is involved in repairing honeycomb core on a damaged edge or panel?
Dry the part and install new core
When are resin injection repairs typically used?
For delamination in solid laminate with small damages
Why can repairs in the trailing edge region be difficult?
Both skins and trailing edge reinforcement may be involved
What is the purpose of vacuum bagging in the repair process?
To add pressure and remove air during the curing process
In what order are plies usually placed during a taper layup sequence?
Smallest ply first
How can wet layup repairs be cured?
At elevated temperatures up to 150 °F
What is the correct orientation for installing repair plies?
Same orientation as original plies
What is the purpose of impregnating the plies with resin in a wet layup repair?
To ensure proper bonding between plies
How should the temperature be increased during the curing process of a repair?
$2 °F$ to $5 °F$ ($0.5 °C$ to $3 °C$) per minute
Learn about the step-by-step process for repairing composite materials in aircraft structures. From impregnating plies with resin to vacuum bagging the repair for curing, this quiz covers essential techniques used in the repair of composite materials in aircraft.
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