Technical Drawing Notations

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Questions and Answers

What is the ideal time frame for a new user to become familiar with the microfiche system?

Less than 15 min

What is the primary purpose of the yellow strip across the top of each microfiche card?

To display the title of the book

How many pages of text can a microfiche card hold, depending on the size of the original pages?

98 to 133

What is the purpose of the introductory page on a microfiche card?

To list the ordering and publisher’s information Signup and view all the answers

How are the microfiche cards organised within their file box?

By chapter according to the AT Sourcebook Signup and view all the answers

What is the primary function of a microfiche reader?

To magnify the image back to its original size Signup and view all the answers

What notation is used to indicate that a drawing is essentially full-scale, but with some details drawn to another scale?

FULL EXCEPT AS NOTED Signup and view all the answers

What is the typical size of an A-size drawing?

8.5 × 11 in. Signup and view all the answers

What is the purpose of the UNLESS OTHERWISE SPECIFIED column in a title block?

To specify the standards of manufacturing tolerances Signup and view all the answers

What type of information is typically indicated in the title block of a manufacturing drawing?

Part number, description, size, and specification number Signup and view all the answers

What is the notation used to indicate that a drawing does not include any parts that are drawn to scale?

NONE Signup and view all the answers

Where is the revision block typically located in a manufacturing drawing?

Upper right corner Signup and view all the answers

What is the size of a C-size drawing?

17 × 22 in. Signup and view all the answers

What is the primary purpose of the 'Application' block in a manufacturing drawing?

To indicate the model of aircraft and part number of the next assembly Signup and view all the answers

What is the purpose of the title block in a drawing?

To provide information about the drawing Signup and view all the answers

What type of information is typically included in the 'Bill of Material' section of a manufacturing drawing?

List of materials needed for manufacturing Signup and view all the answers

What is the purpose of notes in a manufacturing drawing?

To identify deviations from the norm, provide additional information, and specify modifications to the original design Signup and view all the answers

Where are notes typically placed in a manufacturing drawing?

In a block or location that does not interfere with the drawing Signup and view all the answers

What is the primary purpose of the ATA Specifications 100?

To standardize the presentation of technical information Signup and view all the answers

How are aviation manuals structured according to the ATA 100?

Into groups of chapters, sections, and subjects Signup and view all the answers

What information is carried by each page in an aviation manual?

The assigned subject number and the revision date Signup and view all the answers

What is the format of the chapter numbering system in the ATA 100?

A three-element number (XX-XX-XX) Signup and view all the answers

What is the purpose of the chapter numbering system in the ATA 100?

To provide a functional breakdown of the entire aeroplane Signup and view all the answers

What is the significance of the ATA 100 in the aviation industry?

It is a standard for the presentation of technical information Signup and view all the answers

What do the first two digits in the ATA Specification 100 represent?

System and Sub-system identification Signup and view all the answers

What is the purpose of the zeros in the second and third elements of the numbers in the ATA chapter numbering?

To indicate material applicable to a system as a whole Signup and view all the answers

What is the significance of the first element in the ATA Specification 100?

It represents the System/Chapter Signup and view all the answers

What do the last two digits in the ATA Specification 100 represent?

System/Chapter and Subject Signup and view all the answers

What is the purpose of the ATA Specification 100?

To provide a means for dividing material into Systems, Sub-systems, and Subjects Signup and view all the answers

What is the significance of the third digit in the ATA Specification 100?

It represents the Sub-system Signup and view all the answers

Study Notes

Microfiche Cards

Microfiche cards are 4 × 6 inches (11 × 16 cm) plastic cards that hold photographic images
Each microfiche card can hold 98 to 133 pages of text, depending on the original page size
Cards are read with microfiche readers, which magnify the image back to its original size and project it onto a reader screen

Features of Microfiche Cards

Title: Every card features the title of the book prominently in a yellow strip across the top
Microfiche filing number: For easy location of the card within the set, this index number is also indicated in the AT Sourcebook
Introductory page: For each book, the ordering and publisher’s information is listed at the beginning of the card for ease in obtaining paper copies if desired

Drawing Notations

Title block: Drawing number, scale, and size are indicated
Scale: Indicates the size of a drawing, with comments such as FULL, HALF, or 1 INCH = 1 FOOT
Size: Letters are used to specify the size of a drawing, with A-size being 8.5 × 11 in. (210 × 297 mm), B-size being 11 × 17 in. (297 × 420 mm), and so on
Tolerances: Standards of manufacturing tolerances used by the design company, including linear and angular dimensional tolerances and surface roughness
Bill of Material: A list of every material needed to manufacture the part, including quantity, part number, description, size, and specification number
Application: Indicates where the part is used, including the model of aircraft, part number of the next assembly, and quantity of parts needed

Drawing Notes and Revisions

Notes: Added to a drawing to identify a deviation from the norm, give additional information, list alternatives, call attention to an item, or specify modifications to an original design
Revision Block: Records revisions in the upper right corner of a drawing

Air Transport Association (ATA) 100 System

Established by the ATA, an organization of airlines and carriers, to make airline operations more effective and efficient
Specifies the standard for the presentation of technical information
Universally accepted throughout the world as the standard layout format

ATA Chapter Numbering System

Uses a three-element number (XX-XX-XX) to divide material into chapters, sections, and subjects
First two numbers give the System/Chapter identification, next number gives the Sub-system, and the last two numbers represent the Subject
Example: 28-21-20, which breaks down into:
- 28-00-00: Fuel (System/Chapter)
- 28-2 Distribution (Sub-system)
- 28-21 Pressure Fuelling (Sub-sub-system)
- 28-21-20: Removal & Installation of Refuel Drain Shut-off Valve (Subject)

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