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First Edition Dated September, 2000 41
Design
Coordination
Build Tree
Drawing Tree
Flow down
Requirements
&
Key Characteristics
Engineering Product
Definition
Build & Measure
Instructions
4.5.2_1
As “design” includes both engineering product definition and build (and
measure) process instructions, key characteristics must also be noted and
appropriately addressed in process documentation (see 4.5.6).
When key characteristics are identified, they are to be noted on product
definition drawings/datasets/documents with a KEY flagnote symbol next to
the feature or attribute. Next to the flagnote, a discrete alpha designator
should be indicated.
examples
KEY
KEY
A
.010 A B CO
A
10.00 + .01
KEY
A
16.07 +
.02 Volts
4.5.4_3
A note on the drawing, preferably on an isometric view, should indicate the
key characteristic with a brief description of what it is and why it is important
to fit, performance (function), service life or manufacturability.
4.5.4_4
KeyKEY
A
Hole position key to
performance functional
test 69843-2 step 6