Aircraft Sheetmetal Blueprint Reading

Vocabulary flashcards covering title block sections, bill of materials, and the dash number system rules for reading aircraft sheetmetal blueprints.

Title Block

A block usually located in the lower right-hand corner of a blueprint that contains essential information about the drawing, including company name, part name/number, scale, draftsman, and tolerances.

Title Information

The section in the lower right-hand corner of the title block featuring prominent lettering for the issuing company name and part/assembly name and number, alongside scale, draftsman, checker, approvers, and dates.

Next Assembly Information

Three vertical columns at the right of the title block labeled (from right to left) 'Model', 'Next Assem.', and 'No. Req. Ship.' which specify the airplane model, assembly fitment, and required quantity per ship.

Bill of Material and Specifications

The title block area located to the left of the draftsman's name that lists part numbers (left and right), material descriptions, stock sizes, finish specifications, tolerances, and drawing zones.

Dash Number

A system of part identification where a base part number is followed by a dash and an additional number (e.g., 37-89253-2) to indicate specific parts, hand orientations, or assemblies.

Left-Hand Part

The standard part orientation depicted by the draftsman on a drawing; when identified with a dash number, the number following the dash is always an EVEN number.

Right-Hand Part

A part that is the exact mirror image of a left-hand part; it always carries a dash number where the number following the dash is an ODD number.

Symmetrical Parts

Parts that can be used interchangeably as either left- or right-hand parts; they are always listed as left-hand parts and assigned an EVEN dash number when given one.

Consecutive Dash Numbers Rule

The identification rule stating that if two identical part numbers have consecutive dash numbers where the ODD dash number is the next integer larger than the EVEN dash number, they are right-hand and left-hand versions of the same part.

Circle-Enclosed Dash Number

A blueprint notation method where a dash number is placed inside a circle with an arrow pointing to a specific component (such as a skin or stringer) on the drawing itself.