Originally Posted by
Twist & Shout
...With two of us looking, it can be difficult to impossible to spot the traffic. And trust me, this is with lots of head movement and diligent “scanning”.
Is a phrase that can only be trotted out by someone without sin. (Or perhaps without experience, especially on how much traffic that person might have unknowingly missed.)
I second this sentiment. One of the most revealing aspects of operating with TCAS / TAS systems is how much proximate traffic can go unsighted despite multi-crew and diligent scanning in the correct parts of the sky.