Questions and Answers
What shape should the damaged area be trimmed to before installing a patch?
What is the minimum radius that should be left at each corner when trimming the damaged area?
In which scenario should a flush patch type of repair be used?
What application can be used at butt-joints to ensure a tight fit if careful workmanship fails?
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What could be a reason to prefer a flush patch over an overlapping patch?
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What is the first step in the repair of a metal propeller?
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Which regulations define major and minor repairs to propellers?
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Who is authorized to perform repairs or alterations on a propeller?
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What must be observed when making repairs or alterations to a propeller?
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Where can the propeller manufacturer's Service Manual be obtained?
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Study Notes
Patching Skin Repairs
- Begin by trimming the damaged area into a rectangular shape to facilitate patching.
- Ensure corners have a radius of at least one-half inch to avoid stress concentrations.
- Position the hole's sides either span-wise or chord-wise to align with structural requirements.
- A circular patch is an alternative option for the repair.
Types of Repairs
- Use a flush patch type of repair for areas with flush rivets to maintain aerodynamic efficiency and appearance.
- Implement an overlapping patch type of repair where flush rivets are not applicable.
- Opt for flush patches when both aesthetics and airflow are critical.
Workmanship and Finishing
- Employ careful workmanship to prevent gaps at butt joints; gaps can weaken the repair.
- Consider using an epoxy type filler for solid bonding at butt joints to enhance durability and integrity.
Propeller Repair Processes
- Initial step involves assessing damage to determine if a repair is major or minor.
- Major repairs require more stringent procedures and documentation compared to minor repairs.
Regulatory Framework
- Federal Aviation Regulations, Part 43 (FAR 43), establishes guidelines for repairs and alterations to aircraft components.
- FAA Advisory Circular No. 43.13 (FAA AC No. 43.13) provides additional guidance on various repair types and qualified personnel.
Repair Compliance
- Compliance with FAR 43 and FAA AC No. 43.13 is mandatory when repairing or altering propellers.
- Propeller manufacturer's instructions must also be followed to ensure safety and effectiveness of repairs.
Resources
- Propeller manufacturer's Service Manual is a key resource for detailed repair procedures and specifications.
- Cessna Parts Distribution Center (CPD) is the designated provider for obtaining the Service Manual.
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Description
This quiz covers the typical procedures for patching aircraft skin, including trimming damaged areas, patch types, and rivet considerations. Test your knowledge on the best practices for achieving optimal repair effectiveness and appearance in aviation maintenance.
