18
votes
Accepted
While only RL will be sufficient at night for the aircraft to take off, both RL and RCLM are required to take off during the day. Isn't it illogical?
To me it makes perfect sense if you consider that at night there is high contrast between darkness and the lights. It is easy to make out the runway edge lights through the fog under darkness, so the ...
- 81.8k
18
votes
Why wouldn't a plane start its take-off run from the very beginning of the runway to keep the option to utilize the full runway if necessary?
Airlines (operating multiengine airplanes) calculate the necessary takeoff distance in consideration of the potential for an aborted takeoff occurring at the most disadvantageous point (during the ...
- 32.4k
13
votes
Why wouldn't a plane start its take-off run from the very beginning of the runway to keep the option to utilize the full runway if necessary?
Short answer:
Operational efficiency - significantly, you have saved time, and you might also save fuel from an unnecessary longer taxi.
Long Answer:
1. Operational Efficiency:
As discussed above, ...
- 1,761
11
votes
What are the weather minimums in order to take off under IFR conditions?
Carlos answer is absolutely correct but there is some more elaboration on what those minimums are if you are not legal to operate 0-0
Under FAR 91.175 you will find the departure minimum regulations
(...
- 100k
8
votes
What are the weather minimums in order to take off under IFR conditions?
This is dependent upon the type of flight operation that is being conducted as well as the circumstances. In the USA, commercial flight operations under Part 91, 119, 121 and 135 do not permit ...
- 71.9k
7
votes
Accepted
What does "/" (slash) mean in the picture below?
According to the Introduction to Jeppesen Navigation Charts, it means that RVR and meteorological visibility are equivalent here:
3 — Visibility values in meters are labeled with an "m" ...
- 53.5k
7
votes
Why wouldn't a plane start its take-off run from the very beginning of the runway to keep the option to utilize the full runway if necessary?
As an example:
I did my flight training at Boeing Field (KBFI), which has two runways: a GA runway that is 3,700 feet long, and a commercial runway over 10,000 feet.
My flight school was near the ...
- 30.4k
5
votes
Why wouldn't a plane start its take-off run from the very beginning of the runway to keep the option to utilize the full runway if necessary?
There's nothing more useless than fuel you left on the ground, or runway behind you.
We're generally taught to use all the runway, as you point out; why wouldn't you? What if you need it. However for ...
- 31.1k
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