science

Positive locking device

Positive locking device is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Positive locking device rather than just read about it. In short: A positive locking device is a device used in conjunction with a fastener in order to positively lock the fastener. This means that the fastener cannot work loose from vibrations.

Key takeaways

Positive locking device belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Positive locking device to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Positive locking device from memory before moving on to harder problems.

Reference excerpt

A positive locking device is a device used in conjunction with a fastener in order to positively lock the fastener. This means that the fastener cannot work loose from vibrations. The following is a list of positive locking devices:

A split beam nut A castellated nut and a split pin A hex nut or cap screw and a tab washer A hex nut or cap screw and a lock plate Safety wiring with various types of fasteners 7-122. GENERAL. The word safetying is a term universally used in the aircraft industry. Briefly, safetying is defined as: "Securing by various means any nut, bolt, turnbuckle etc., on the aircraft so that vibration will not cause it to loosen during operation." These practices are not a means of obtaining or maintaining torque, rather a safety device to prevent the disengagement of screws, nuts, bolts, snap rings, oil caps, drain cocks, valves, and parts. Three basic methods are used in safetying; safety-wire, cotter pins, and self-locking nuts. Retainer washers and pal nuts are also sometimes used. 7-124d. Safety wire must be installed in a manner that will prevent the tendency of the part to loosen.

References

"7. Aircraft Hardware, Control Cables, and Turnbuckles" (PDF). AC 43.13-1B - Acceptable Methods, Techniques, and Practices - Aircraft Inspection and Repair. 8 September 1998. Retrieved 2012-12-11.

Illustrations

Worked examples

Example 1 — a first encounter with Positive locking device

Start with the simplest possible case. Write down what Positive locking device claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Positive locking device before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Positive locking device ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Positive locking device

In research: Positive locking device appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Positive locking device in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Positive locking device is common in secondary-school and first-year university syllabi. It links to neighbouring topics Fasteners, so understanding it makes those chapters shorter.
In everyday life: Look for Positive locking device outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Positive locking device in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Positive locking device means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Positive locking device out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Positive locking device in simple terms?

A positive locking device is a device used in conjunction with a fastener in order to positively lock the fastener. This means that the fastener cannot work loose from vibrations.

Why does Positive locking device matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Positive locking device?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Positive locking device.