Shadowing Practice: How TCAS Prevents Mid-Air Collision - Learn English Speaking with Video

Choose a practice mode

Each mode opens a full-screen practice room.

34 sentences
If sentences are too short or too long, click Edit to adjust them.
1
Reduced vertical separation minima, or RVSM, requires aircraft flying in the same airspace to be separated by 1,000 feet.
2
Precision altimeters and ground-based secondary surveillance radars have made it possible to fly aircraft in such close proximity safely.
3
However, as increasing demand continues to congest the airspace, the risk of mid-air collision has never been greater.
4
A simple miscommunication, or a lapse in concentration, is enough to send two aircraft, on a collision course.
5
To avert the calamity, one of the most advanced system is installed, on the aircraft.
6
The Traffic Collision Avoidance System.
7
The TCAS system has a computer, in the aircraft avionics compartment, and two antennas.
8
The top antenna, scans the area, above the aircraft, and the bottom antenna, scans the area, below.
9
The TCAS computer collects several data from the aircraft systems and creates a three-dimensional area of protected airspace around the aircraft.
10
The system has a wide scanning range and can detect several aircraft in the vicinity, but only gives warning alerts when a traffic is a potential collision threat.
11
Let's see how the system determines that.
12
The onboard TCAS computer sends interrogation signal to the traffic aircraft.
13
The TCAS computer of the traffic aircraft responds with identification code and altitude.
14
The onboard TCAS computer locates the position of the traffic aircraft by tracking the direction of the response signal
15
and calculating the distance from the traffic by measuring the time taken between interrogation and response.
16
Change in altitude and position of the traffic over time helps the TCAS computer to calculate the airspeed, vertical speed, and heading of the traffic aircraft.
17
Using data of both the aircraft, the TCAS computer solves three important questions.
18
Number one, what is the closest point of approach?
19
CPA is the point where the two aircraft will meet, having the minimum distance between them.
20
Number two is the traffic and intruder.
21
That is will the traffic aircraft path interfere with the protected airspace at the time of CPA?
22
If yes, then the most important question, how much time is left to meet at the closest point?
23
If both the aircraft continue on the same flight path with 45 seconds to go, the TCAS issues a traffic advisory.
24
And the traffic is displayed on the navigation display.
25
Amber dot indicates the aircraft and the plus 05 indicates the traffic is 500 feet above.
26
In traffic advisory, there are no maneuvering instructions.
27
It just draws the attention of the flight crew to an incoming aircraft.
28
With 25 seconds to go, TCAS warning changes to resolution advisory.
29
The amber indications turn red.
30
Instruction is given in the cockpit to maneuver the aircraft.
31
Red lines on the flight display indicate the areas to avoid flying in.
32
The TCAS computer on the traffic aircraft is coordinated to give an opposite direction command.
33
Clear up conflict.
34
When it comes to possible mid-air collision, TCAS may be the last line of defense, but a very effective one.

Download App

Everything you need to speak fluently

AI PronunciationScore every sentence
IPA PracticeMaster every sound
VocabularyBuild your word bank
Vocab GameLearn while playing

Same Channel

FOR YOU

Recommend Video

What You'll Learn from This Video

This clip is a goldmine for building technical vocabulary and listening comprehension of complex explanations—skills critical for IELTS speaking practice, where clear communication of ideas matters. You’ll also master how to structure detailed descriptions, a key ability for describing processes (like how TCAS works) in both casual and formal contexts. These skills translate directly to real-world scenarios, from explaining a work project to acing an academic presentation.

Listen For These Sounds

The speaker uses subtle connected speech patterns that native listeners take for granted. Notice how "Reduced vertical separation minima" flows into "RVSM" with a slight pause, not a full stop. Phrases like "scans the area above" link "area" and "above" with a soft "r" sound, making it "area-above." Also, reductions like "it’s" instead of "it is" and "they’re" instead of "they are" are common—listen for how these shorten the speech without losing clarity. These patterns are essential for understanding fast-paced English, whether in videos or real conversations.

Say It Like a Native: Rhythm and Stress

To mirror the speaker’s natural rhythm, focus on stressing key terms like "TCAS," "collision," "altitude," and "resolution advisory." These words carry the meaning, so emphasizing them helps listeners follow the process. Use the shadowing technique—repeat the speaker’s lines immediately after hearing them, mimicking their pace and intonation. This "shadow speech" trains your mouth to move like a native and improves your ability to process and reproduce English in real time. For extra practice, use a shadowing app to record yourself and compare it to the video; you’ll quickly notice where to adjust your stress and timing. By practicing with this video, you’ll not only learn about aviation safety but also build the fluency and confidence needed for success in IELTS speaking and beyond.

Grammar in this video

The structures the speaker uses most, with the exact words from the video:

StructureIn the video
Passive voice be + past participle — the focus is on what happens, not who does itbe separated · is installed · is left
Present perfect have/has + past participle — a past action that still matters nowhave made · has never been

What is the Shadowing Technique?

Shadowing is a science-backed language learning technique originally developed for professional interpreter training and popularized by polyglot Dr. Alexander Arguelles. The method is simple but powerful: you listen to native English audio and immediately repeat it out loud — like a shadow following the speaker with just a 1–2 second delay. Unlike passive listening or grammar drills, shadowing forces your brain and mouth muscles to simultaneously process and reproduce real speech patterns. Research shows it significantly improves pronunciation accuracy, intonation, rhythm, connected speech, listening comprehension, and speaking fluency — making it one of the most effective methods for IELTS Speaking preparation and real-world English communication.

Shadowing technique: read the full step-by-step guide →