Aircraft Engineering Drawing and Tolerance

Title Block

• A title block is typically located in the lower right corner of an aircraft drawing
• It contains information necessary to manufacture the illustrated part
• Includes material specifications, tolerances, surface finish, and materials and fastener specifications (bolts, rivets, screws, etc.)
• The part name is put in the box labeled 'title'

Bill of Material

• Lists every material needed to manufacture the part
• Includes quantity required, part number, description, size, and specification number for each material

Application

• Indicates where the part is used
• Shows the model of aircraft the part is used on and the part number of the next assembly
• Includes the quantity of parts needed for both the next assembly and the final assembly

Notes

• Added to a drawing to identify a deviation from the norm
• Provides additional information, lists alternatives, calls attention to an item, or specifies modifications to an original design
• Related to the drawing or other relevant drawings
• Typically found in a block or placed in a location that does not interfere with the drawing

Revision Block

• Records revisions to a drawing
• Includes the description of the revision, the date the revision was released, and the initials of the person approving the revision
• Located in the upper right corner of a drawing

Zones

• A system of location used in large aircraft drawings
• Divided into sections marked with letters (A, B, etc.) vertically and numbers (1, 2, etc.) horizontally
• Identifies a specific location on the drawing using a combination of letters and numbers (e.g., C-7)

Dimensioning

• Essential for a drawing to be meaningful
• Represents the perfect size and are called basic or nominal dimensions
• Accurately gives all needed dimensions

Illustrated Parts Catalogue

• Shows the location and part numbers of items installed on an aircraft
• Contains detailed exploded views of all areas of an aircraft
• Not considered acceptable data for maintenance and repair by the FAA

Overhaul Manual

• Contains information about the repair and rebuilding of components that can be removed from an aircraft
• Includes multiple illustrations showing how individual components are assembled
• Lists individual part numbers

Wiring Manual

• Illustrates aircraft electrical systems and their components
• Contains schematic diagrams to aid in electrical system troubleshooting
• Lists part numbers and locations of electrical system components

Structural Repair Manuals

• Used for repair of serious damage to an aircraft's primary and secondary structure
• Contains detailed information for repairing an aircraft's structure

Microform Readers

• Equipment should be inspected weekly and maintained daily
• Dust on the glass flats can be magnified by the optics of the reader
• Dust can also be transferred to the microform, where it might obscure details and even damage film
• Dirty equipment decreases image quality
• Grime builds up on the edges of glass flats, creating another source of film abrasion

Tolerance Allowance

• Includes lower and upper limits for hole shaft tolerance
• Importance of allowance and tolerance in aircraft maintenance and repair

This quiz covers the basics of aircraft engineering drawing, including title blocks and tolerance allowances. Learn about the importance of accurate measurements and specifications in aircraft manufacturing. Test your knowledge of aviation maintenance practices and CASA Part 66 regulations.