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Questions and Answers
Which type of cotter pin cannot be used on a moving part?
Which type of cotter pin cannot be used on a moving part?
What is the main use of the AN970 washer?
What is the main use of the AN970 washer?
What is the primary function of safety devices such as lockwire and cotter pins?
What is the primary function of safety devices such as lockwire and cotter pins?
Which of the following is NOT a type of lock wire mentioned?
Which of the following is NOT a type of lock wire mentioned?
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What is the function of witness wire in control cables?
What is the function of witness wire in control cables?
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What distinguishes NAS bolts from standard aircraft bolts?
What distinguishes NAS bolts from standard aircraft bolts?
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Which statement about the markings on aircraft bolts is accurate?
Which statement about the markings on aircraft bolts is accurate?
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What does a bolt's ' grip' refer to?
What does a bolt's ' grip' refer to?
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What is one characteristic of close tolerance bolts?
What is one characteristic of close tolerance bolts?
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How is the diameter of a bolt typically measured?
How is the diameter of a bolt typically measured?
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Study Notes
Week 1 Tools - Bolts
- Bolt Materials: Standard aircraft bolts are most commonly made of steel, followed by corrosion-resistant steel, stainless steel, aluminum, and titanium.
- Standard Bolts (AN): Commonly used in general aviation.
- NAS Bolts: High tensile strength and close tolerance.
- Special Bolts: Used in applications requiring tighter fits, often marked with an (S) on the head.
- Aircraft Bolt Markings: Standard markings include X or *, corrosion-resistant bolts (-) and aluminum bolts (- -).
- Bolt Use Restrictions: Do not use aluminum bolts for tension applications—this is usually removed for maintenance.
- Bolt Head: Larger than the bolt's diameter, typically hexagonal, to aid in directional control during use.
- Bolt Grip/Shank: Threaded portion of the bolt, often referred to as the grip. The grip diameter matches the bolt diameter.
- Bolt Threads: UNC (coarse) and UNF (fine) threads are used; the thread gauge determines TPI (threads per inch).
AN Bolts (Air Force - Navy)
- General Purpose Hex Head Bolts (GPB): Used more broadly and identified by a 6-point hexagonal head.
- Bolt Dimensions: Specific dimensions including diameter and length.
- AN Bolt Material: Cadmium-plated Nickel Steel is a common material used; corrosion-resistant (C) and aluminum alloy (DD) materials are also used.
- AN Numbering System: Example: AN4-20A. The numbering system includes diameter, material, and length information; an 'A' or 'H' at the end signifies if there is a hole in the bolt head.
Week 2 (Nuts & Bolts)
- Nuts & Bolts Classification: Divided into self-locking and non-self-locking types.
- Non Self-Locking: Requires an external locking device (e.g., cotter pins).
- Self-Locking: Integrated locking mechanism, commonly utilized in aircraft applications.
- Self Locking Types: Two primary types: metal and nylon.
- Washers: Used in many applications, mainly to protect and ensure proper contact. The most common types are AN960 and AN970.
Week 3 (Safety)
- Safety Features: Prevent failure of secured devices, providing backup and security during events such as fire suppression.
- Lockwiring: An example of a safety feature to prevent unwanted assembly.
- Types of Lock Wire: Stainless steel, Inconel, and Monel are types of lock wire to know.
- Standard Wire Diameters: 0.020”, 0.032”, 0.041” are common diameters.
- Turnbuckles: Purpose is to adjust cable tension; used in control cables on aircraft.
- Witness Wire: Designed for visible confirmation of securement during inspections to prevent damage and misuse of other equipment.
- Witness Wire Application: DO NOT use lock wire when deploying witness wire.
Additional Notes
- Witness wire is used to ensure that the cover remains in place, such as during a fire suppression.
- Minimal breaking force is ideal for witness wire to prevent damage to equipment.
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Description
This quiz focuses on the various types of bolts used in aviation, including their materials, standards, and specific applications. Learn about the characteristics of standard aircraft bolts, NAS bolts, and special bolts alongside their markings and restrictions. Test your knowledge on the essential tools required for safe and efficient aviation operations.
