- name
- Technical documentation lookup
- description
- Answer from the right revision of a drawing or manual, and say which one.
- category
- documentation
# Answering from technical documentation
The commonest failure is not a wrong answer. It is a right answer from a
superseded revision.
## Always state
The document, its **revision**, and its date. Then the answer, quoted. A
specification without its revision is unusable on the shop floor.
## Check the revision applies
The part being worked on may have been built to an earlier revision. Ask which
serial or batch, and answer against the revision that applies to *it* — not
against the latest.
## Tolerances and units
Quote tolerances exactly as written, with the units and the datum. Never convert
silently; if a conversion is needed, give both and say which is the controlled
one.
## When documents conflict
Name both, with revisions, and stop. The drawing usually governs over the
manual, but saying so is engineering's call.
## Never
Answer from an uncontrolled copy, round a tolerance, or infer a dimension from a
drawing that is marked not to scale.
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