Departing from a taxiway / TO performance
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Departing from a taxiway / TO performance
Hi all,
A bit nit-picking maybe, yet I can't figure out the exact answer from the books.
Imagine a runway without displaced threshold but with a taxiway leading straight onto the runway (entry angle 0) two examples FCO 25 and MAD 36R
I always though you have to physically move the aircraft over the threshold before applying TO power in order not to take off from the taxiway = as they are not inspected the same way as the runway for FOD for example.
However when I looked at the TORA in LEMD 36R full length vs Y2 I see a different of 45m even though both of the taxiways lead you onto the same threshold (even though Y2 shows entry angle of 90 it joins the runway well prior the threshold)
Was my assumption about taxiways vs displaced threshold always wrong, or indeed, the 45m for take off from Y2 are subtracted for the 90 degrees turn even though it take place prior to the actual threshold?
A bit nit-picking maybe, yet I can't figure out the exact answer from the books.
Imagine a runway without displaced threshold but with a taxiway leading straight onto the runway (entry angle 0) two examples FCO 25 and MAD 36R
I always though you have to physically move the aircraft over the threshold before applying TO power in order not to take off from the taxiway = as they are not inspected the same way as the runway for FOD for example.
However when I looked at the TORA in LEMD 36R full length vs Y2 I see a different of 45m even though both of the taxiways lead you onto the same threshold (even though Y2 shows entry angle of 90 it joins the runway well prior the threshold)
Was my assumption about taxiways vs displaced threshold always wrong, or indeed, the 45m for take off from Y2 are subtracted for the 90 degrees turn even though it take place prior to the actual threshold?
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The point is:
LEMD TORA
36R 3500m
36R Y1 = 3500m
36R Y2 = 3445m
The threshold 36R is definitely past Y2
http://www.aena.es/csee/Satellite?bl...&ssbinary=true
so I don't think you'd be loosing 45m lining up from Y2
Conclusion you are expected to start your takeoff roll from prior crossing the THD?
LEMD TORA
36R 3500m
36R Y1 = 3500m
36R Y2 = 3445m
The threshold 36R is definitely past Y2
http://www.aena.es/csee/Satellite?bl...&ssbinary=true
so I don't think you'd be loosing 45m lining up from Y2
Conclusion you are expected to start your takeoff roll from prior crossing the THD?
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I always though you have to physically move the aircraft over the threshold before applying TO power in order not to take off from the taxiway
LIDO Legends and tables:
Prolongation of Physical Runway
A prolongation of the physical runway may be a blast pad, overrun or start point. Prolongation of a runway usable for take-off beyond the physical runway length is identified with a TORA arrow.
A prolongation of the physical runway may be a blast pad, overrun or start point. Prolongation of a runway usable for take-off beyond the physical runway length is identified with a TORA arrow.
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I always though you have to physically move the aircraft over the threshold before applying TO power in order not to take off from the taxiway = as they are not inspected the same way as the runway for FOD for example.
