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![airmainengineer Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::1169088148745400320.png) aircraftmaintenancengineer [@airmainengineer](/creator/twitter/airmainengineer) on x 32.2K followers
Created: 2025-07-16 09:01:00 UTC

🛫 Understanding TCAS: Traffic Collision Avoidance System
TCAS helps pilots stay aware of nearby aircraft and avoid collisions by providing real-time alerts and guidance. ✈️

🔍 Key TCAS Symbols & Meanings:  

⚪ White Diamond: No immediate threat
◇ Filled White Diamond: Nearby aircraft within X NM and ±1200 ft altitude
🟠 Yellow Circle: Traffic Advisory — prepare to act
🔴 Red Square: Resolution Advisory — take immediate action!
🚨 Protection Zones:  

RA Zone (Inner Red): Collision imminent — act now!
TA Zone (Outer Yellow): Potential conflict — stay alert!
Proximity Zone (Outer Blue): Aircraft nearby but no conflict
📊 Display Details:  

Vertical separation shown in 1000 ft increments
Vertical speed trend indicates climb or descent of other aircraft
Range rings (usually XXX NM) enhance situational awareness
Stay safe and stay informed with TCAS!  

📸 by @AVIOKNOWLEDGE

![](https://pbs.twimg.com/media/Gv7kbjjXoAAzsnt.jpg)

XXXXXX engagements

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**Related Topics**
[red square](/topic/red-square)
[realtime](/topic/realtime)

[Post Link](https://x.com/airmainengineer/status/1945408313392267306)