Podcast
Questions and Answers
What is the primary function of aircraft hardware?
What is the primary function of aircraft hardware?
Which of the following specifications is NOT typically used for identifying aircraft threaded fasteners?
Which of the following specifications is NOT typically used for identifying aircraft threaded fasteners?
In what situations would bolts typically be preferred over screws in aircraft assembly?
In what situations would bolts typically be preferred over screws in aircraft assembly?
What are the characteristics of rivets as fastening devices in aircraft?
What are the characteristics of rivets as fastening devices in aircraft?
Signup and view all the answers
Why is the selection and use of aircraft hardware critical?
Why is the selection and use of aircraft hardware critical?
Signup and view all the answers
Which type of fastening method is typically least suitable for parts that require frequent servicing?
Which type of fastening method is typically least suitable for parts that require frequent servicing?
Signup and view all the answers
What is a common identifier for quick-release fasteners used in aircraft?
What is a common identifier for quick-release fasteners used in aircraft?
Signup and view all the answers
Which characteristic distinguishes bolts from screws in aircraft applications?
Which characteristic distinguishes bolts from screws in aircraft applications?
Signup and view all the answers
What is the primary distinction between the threaded ends of bolts and screws?
What is the primary distinction between the threaded ends of bolts and screws?
Signup and view all the answers
How are external threads designated in ISO metric screw threads?
How are external threads designated in ISO metric screw threads?
Signup and view all the answers
How is a bolt typically tightened in an assembly?
How is a bolt typically tightened in an assembly?
Signup and view all the answers
When might it be necessary to replace an aircraft fastener?
When might it be necessary to replace an aircraft fastener?
Signup and view all the answers
Which of the following standards specifies a shorter list of thread dimensions for ISO metric screw threads?
Which of the following standards specifies a shorter list of thread dimensions for ISO metric screw threads?
Signup and view all the answers
What material are aircraft bolts NOT typically fabricated from?
What material are aircraft bolts NOT typically fabricated from?
Signup and view all the answers
What defines the grip length of a bolt?
What defines the grip length of a bolt?
Signup and view all the answers
What is the significance of the letter 'S' stamped on the head of an aircraft bolt?
What is the significance of the letter 'S' stamped on the head of an aircraft bolt?
Signup and view all the answers
What is true about the threaded end of a screw?
What is true about the threaded end of a screw?
Signup and view all the answers
Which thread series specifies 14 threads per inch on a 1-inch diameter fastener?
Which thread series specifies 14 threads per inch on a 1-inch diameter fastener?
Signup and view all the answers
Which aircraft bolt types are available in internal wrenching style?
Which aircraft bolt types are available in internal wrenching style?
Signup and view all the answers
What is a characteristic of the screw's threaded section compared to a bolt's?
What is a characteristic of the screw's threaded section compared to a bolt's?
Signup and view all the answers
What method is NOT identified for classifying aircraft bolts?
What method is NOT identified for classifying aircraft bolts?
Signup and view all the answers
Which is NOT a head style of AN bolts used in aircraft structures?
Which is NOT a head style of AN bolts used in aircraft structures?
Signup and view all the answers
What differentiates American National thread series from the American Standard Unified thread series?
What differentiates American National thread series from the American Standard Unified thread series?
Signup and view all the answers
What is the primary reason for using like bolts in replacement within aircraft?
What is the primary reason for using like bolts in replacement within aircraft?
Signup and view all the answers
What does the '3' in the bolt part number AN3DD5A indicate?
What does the '3' in the bolt part number AN3DD5A indicate?
Signup and view all the answers
Which marking indicates the bolt is made of corrosion resistant steel?
Which marking indicates the bolt is made of corrosion resistant steel?
Signup and view all the answers
What do the letters 'DD' in the bolt part number AN3DD5A signify?
What do the letters 'DD' in the bolt part number AN3DD5A signify?
Signup and view all the answers
What type of bolt is indicated by a part number starting with 'AN'?
What type of bolt is indicated by a part number starting with 'AN'?
Signup and view all the answers
How are close tolerance NAS bolts marked?
How are close tolerance NAS bolts marked?
Signup and view all the answers
Which letter in a bolt part number indicates the shank is undrilled?
Which letter in a bolt part number indicates the shank is undrilled?
Signup and view all the answers
What indicates that a bolt is cadmium plated?
What indicates that a bolt is cadmium plated?
Signup and view all the answers
What materials are aircraft nuts commonly made from?
What materials are aircraft nuts commonly made from?
Signup and view all the answers
What is the main characteristic that distinguishes self-locking nuts from non-self-locking nuts?
What is the main characteristic that distinguishes self-locking nuts from non-self-locking nuts?
Signup and view all the answers
Which type of nut is designed specifically for use with drilled shank bolts?
Which type of nut is designed specifically for use with drilled shank bolts?
Signup and view all the answers
Which of the following nuts can withstand large tensional loads?
Which of the following nuts can withstand large tensional loads?
Signup and view all the answers
What feature is common in non-self-locking nuts to ensure safety?
What feature is common in non-self-locking nuts to ensure safety?
Signup and view all the answers
Why is the light hex nut limited in use on aircraft structures?
Why is the light hex nut limited in use on aircraft structures?
Signup and view all the answers
What distinguishes the castellated shear nut from the castle nut?
What distinguishes the castellated shear nut from the castle nut?
Signup and view all the answers
Which type of nut is lighter and used for miscellaneous light tension requirements?
Which type of nut is lighter and used for miscellaneous light tension requirements?
Signup and view all the answers
Which of the following is NOT a type of non-self-locking nut?
Which of the following is NOT a type of non-self-locking nut?
Signup and view all the answers
What is the primary purpose of the plain checknut, AN316?
What is the primary purpose of the plain checknut, AN316?
Signup and view all the answers
In which scenario should self-locking nuts not be used?
In which scenario should self-locking nuts not be used?
Signup and view all the answers
Which type of self-locking nut is designed specifically to withstand severe vibrations?
Which type of self-locking nut is designed specifically to withstand severe vibrations?
Signup and view all the answers
What materials are represented in the three typical kinds of self-locking nuts considered in the handbook?
What materials are represented in the three typical kinds of self-locking nuts considered in the handbook?
Signup and view all the answers
What are self-locking nuts commonly used for in aircraft applications?
What are self-locking nuts commonly used for in aircraft applications?
Signup and view all the answers
Which self-locking nut type is representative of the nylon insert category?
Which self-locking nut type is representative of the nylon insert category?
Signup and view all the answers
What must be ensured when attaching plates to a structure in aircraft?
What must be ensured when attaching plates to a structure in aircraft?
Signup and view all the answers
What is a characteristic of self-locking nuts in terms of safety features?
What is a characteristic of self-locking nuts in terms of safety features?
Signup and view all the answers
Study Notes
Learning Objectives - Week 2 Day 5
- The learning objectives for week 2 day 5 focus on aircraft hardware, fasteners, and their identification, classifications, and coding.
Aircraft Hardware
- Aircraft hardware refers to various fasteners and small items essential for aircraft manufacture and repair.
- Effective aircraft operation is highly reliant on proper selection and utilization of aircraft hardware.
Methods of Joining Metal Parts
- Common methods include riveting, bolting, brazing, and welding.
- The chosen method must create a strong bond as robust as the constituent parts.
Aircraft Hardware Identification
- Most aircraft components are identified using specification numbers or trade names.
- Threaded fasteners and rivets are commonly identified by AN (Air Force-Navy), NAS (National Aircraft Standard), or MS (Military Standard) numbers.
- Quick-release fasteners are often identified by their factory trade names and size designations (e.g., Dzus, Camloc, Airloc).
Threaded Fasteners
- Threaded fasteners (like bolts and screws) enable quick disassembly and replacement of maintenance-critical parts.
- Riveting and welding parts regularly can weaken the joint.
- Bolts are generally used where high strength is prioritized; screws are chosen when strength isn't paramount.
- Bolts and screws both include a head and threading at one end.
- Bolts are always blunt-ended, in contrast with screws which can be blunt or pointed.
Thread Classification
- Aircraft fasteners frequently use NC (American National Coarse), NF (American National Fine), UNC (American Standard Unified Coarse), and UNF (American Standard Unified Fine) thread types.
- Thread specifications define the number of threads per inch (e.g., 1-14 NF, 1-12 UNF) and are crucial for proper assembly.
- Threads are also designated by class, which indicates the permitted tolerance in manufacturing (e.g., Class 1 is loose, Class 4 is close).
- Aircraft bolts are most often manufactured to a medium fit, Class 3.
British Association (BA) Screw Threads
- BA threads are an outdated standard used for miniature instruments or models.
- Their design was metric-based and aimed to anticipate worldwide metrication.
- The British Standards Institution (BSI) recommends BA sizes over BSW and BSF screws for small items.
ISO Metric Screw Threads
- ISO metric screw threads are the prevalent standard globally.
- ISO metric screws include a variety of major and minor diameter and pitch specifications.
- External threads are denoted with lowercase letters, while internal threads are represented by uppercase letters.
Aircraft Bolts
- Aircraft bolts are commonly manufactured from steel, sometimes plated with cadmium or zinc for corrosion resistance, or from aluminum alloys, often anodized to better prevent corrosion.
- Bolts are categorized into general-purpose, AN, NAS, or MS bolts depending on specific application needs or additional strength requirements.
- Identification markings on bolt heads can denote manufacturer, material, and whether it's standard or a special bolt.
Aircraft Nuts
- Aircraft nuts are produced in varied shapes and sizes.
- Often made from cadmium-plated carbon steel, stainless steel, or anodized aluminum alloys.
- Nuts are typically categorized as either non-self-locking or self-locking based on their locking mechanism:
- Non-self-locking nuts usually require additional locking devices (like safety wire or cotter pins).
- Self-locking nuts incorporate a built-in locking system.
- Different nut types include:
- Castle nuts (AN310, AN320) used with threaded joints.
- Plain hex nuts and light hex nuts (AN315, AN335, AN340, AN345) often used for various tasks.
- Wing nuts (AN350) which are easily tightened and loosened by hand.
- Elastic stop nuts which have a nylon collar to prevent loosening.
- Boots self-locking nuts.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
Test your knowledge of aircraft hardware specifications and applications with this quiz. Covering topics such as the functions of different fasteners and their best use cases in aircraft assembly, this quiz is perfect for students and professionals in the aviation field.
