B777 visual segment
Hello,
I am currently working on my 777 type rating and I am wondering about the B777 cutoff angle.
For two reasons : how to evaluate the visual segment in an LVO takeoff ? Usually, we will count the number of lights available and multiply the number of visible light intervals by its 15m length. But then we need to add the cockpit cutoff distance. What is the cockpit cutoff distance on this plane ?
Then, about the landing phase, when we follow a PAPI, the main gear is bound to hit the ground, without flare, at around 100-130m after threshold.
So the problem is more often short landing than long landing. But if you do manage to perform a doubtfully long landing, how can you evaluate ?
From the sim sessions we've done, it seems like when we see the xxxm meter marks disappear and touchdown right at this moment, the touchdown distance is approximately 100-150 (??) meters before the mark.
What is the value of the cutoff angle ? What is the cutoff distance if we have the main gear on ground, 5° of pitch ?
The formula is rather easy, take the pilot eye height on ground, add pitch angle (rad) * distance from pilot to main gear, to find the eye height.
Then complete a triangle with this height, and the cutoff angle minus the chosen pitch angle. This will give a good idea on how to evaluate landing distance.
I just lack the cutoff angle.
Thanks