Handbook · 22 chapters, free to read online

The Calibration Control Kit Handbook

A complete, practical system for measuring equipment in an aerospace shop: know every instrument and what it puts at risk, keep it in calibration, prove it is fit for the job, and handle an out-of-tolerance result the day it happens.

Start reading: chapter 1 The kit's tools

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The problem it solves

Calibration looks like the easiest part of a quality system: a list, a sticker, a certificate. It is also one of the most reliable sources of audit findings, because the list answers only one question (is it in date?) and the auditor asks three more: what did this instrument measure, what did you do when it failed, and how do you know it is good enough for that tolerance? This handbook is the operating manual for the Calibration Control Kit. It sets out one workflow from receiving an instrument to retiring it, who does what, which tool to use at each step, how to handle an out-of-tolerance result, when a gauge study is needed, the weekly and monthly rhythm, and how to set it all up in thirty days without buying new software.

Who it is for

Quality managers and calibration coordinators who own the measuring equipment system; quality engineers who run gauge studies and impact assessments; the general manager who sponsors it.

When to use it

When calibration findings keep coming back; when an out-of-tolerance result has no product assessment; when a customer asks for gauge studies behind key characteristics; when you take over a quality system; or a quarter before a surveillance or recertification audit.

How to use this handbook

Read chapters 1 to 3: why calibration systems fail audits, the kit, and the workflow it runs.
Agree the roles in chapter 4 with your general manager before you change anything.
Build or rebuild the equipment register (chapter 5) using the Calibration and Measurement Risk Register (E01).
Read chapter 9 before you need it: the first out-of-tolerance result is not the time to learn the method.
Follow the thirty-day setup in chapter 16, and run the weekly and monthly rhythm in chapter 14 from the first week.
Use the worked example in chapter 17 to see every tool used on the same instruments.
Give your general manager the one-page summary in chapter 18, and pin the quick reference (chapter 19) where the calibration work is done.

The chapters

Aegis Insights: how we approach this work

Aegis Insights are our own guidance: how we approach this work and why, from years inside aerospace quality systems. They are not requirements of any standard or customer.

Definitions

Term	What it means here
Calibration	Comparing an instrument's readings with a reference standard of known accuracy, traceable to national or international standards, and recording the results.
As found / as left	The instrument's condition before any adjustment, and after calibration and adjustment.
Out of tolerance (OOT)	An as-found result outside the accuracy limits set for the instrument.
Last known good	The last date the instrument was shown to be within its limits.
Impact assessment	The record of what an out-of-tolerance instrument measured since last known good, how the error could have affected each result, and what was decided.
Interim check	A quick check between calibrations, such as a reading on a gauge block or master.
Recall system	The way instruments are called in before they fall due and kept from use when they do.
Measurement traceability	An unbroken chain of calibrations linking results to national or international standards.
Measurement uncertainty	The doubt in a measurement result, stated as a range around the reading.
Accuracy ratio	The tolerance checked divided by the instrument's uncertainty (often aimed at 4 to 1 or better).
Guard band	A narrower acceptance limit used where measurement uncertainty is significant near a limit.
Measurement system analysis (MSA)	Studies showing whether a measurement system is fit for the measurement it makes.
Gauge R&R	A study of repeatability and reproducibility: how much measurement variation comes from the gauge and from the people using it.
Attribute agreement	A study of whether inspectors making pass/fail decisions agree with each other and a reference.
Key characteristic	A feature whose variation significantly affects fit, function, performance or service life (see AS9103).
Accredited laboratory	A calibration laboratory assessed by an accreditation body against ISO/IEC 17025 for a stated scope.

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Intervals, checks, ratios and study guidelines here are starting points. Your customers may specify their own calibration, notification and measurement system requirements (for example AS13003), and those come first.

A management aid, not certification or a registrar audit. Using it does not by itself show conformity to AS9100D or any other standard, and your customers' requirements may add to it.

Clause numbers refer to AS9100D (SAE AS9100 Rev D) unless another document is named. The standards' text is not reproduced here: use your own licensed copy.