science

Minimum reception altitude

Minimum reception altitude 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 Minimum reception altitude rather than just read about it. In short: In aviation, minimum reception altitude (MRA) is the lowest altitude on an airway segment where an aircraft can be assured of receiving signals from off-course navigation aids like VOR that define a fix. An MRA is determined by FAA flight inspection traversing an entire route of flight to establish the minimum altitude the navigation signal can be received for the route (which, along with obstacle clearance, defines…

Key takeaways

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

Reference excerpt

In aviation, minimum reception altitude (MRA) is the lowest altitude on an airway segment where an aircraft can be assured of receiving signals from off-course navigation aids like VOR that define a fix. An MRA is determined by FAA flight inspection traversing an entire route of flight to establish the minimum altitude the navigation signal can be received for the route (which, along with obstacle clearance, defines the Minimum Enroute Altitude - MEA) and for off-course NAVAID facilities that determine a fix. When the MRA at the fix is higher than the MEA, an MRA is established for the fix, and is the lowest altitude at which an intersection can be determined.

See also Above ground level Minimum en route altitude (MEA) Minimum obstacle clearance altitude (MOCA) Minimum safe altitude

References

Worked examples

Example 1 — a first encounter with Minimum reception altitude

Start with the simplest possible case. Write down what Minimum reception altitude 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 Minimum reception altitude 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 Minimum reception altitude 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 Minimum reception altitude

In research: Minimum reception altitude 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 Minimum reception altitude 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: Minimum reception altitude is common in secondary-school and first-year university syllabi. It links to neighbouring topics Air traffic control, Altitudes in aviation, Aviation stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Minimum reception altitude 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 Minimum reception altitude in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Minimum reception altitude 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 Minimum reception altitude out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Minimum reception altitude in simple terms?

Why does Minimum reception altitude 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 Minimum reception altitude?

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 Minimum reception altitude.