aircraft on one drawing may be taken as the zero
station. Objects to the right or left of center along the
wings or stabilizers are found by giving the number of
inches between them and the centerline zero station.
On other drawings, the zero station may be at the nose
of the fuselage, at a firewall, or at some other location
depending on the purpose of the drawing. Figure 1-3
shows station numbers for a typical aircraft.
Bill of Material
The bill of material block contains a list of the
parts and/or material needed for the project. The block
identifies parts and materials by stock number or other
appropriate number, and lists the quantities requited.
The bill of material often contains a list of
standard parts, known as a parts list or schedule.
Figure 1-4 shows a bill of material for an electrical
The application block on a blueprint of a part or
assembly (fig. 1-5) identifies directly or by reference
the larger unit that contains the part or assembly on
the drawing. The NEXT ASSY (next assembly)
column will contain the drawing number or model
Figure 1-5.Application block.
Figure 1-4.Bill of material.