Dear all,
This pertains to the 'parameters' one must use to 'decide' whether for 'today's t/o conditions' what is the 'best' flap setting.
This is a comparison between flap 15 v/s 20 Dep for NEWARK/KEWR/22R (11000'/3353metres)
Acceleration ALT 1000' AGL in both cases.
ATOW 335.3T
RTOW Today was
-350T (F20/OLW)
-349T (F15/OLW)
-Structural (351T) if packs OFF
Here is the snapshot of the performance F15
F20 performance -
F15 takeoff details
F20 takeoff details
Kindly ignore assume temperature calculations & disclaimer in the snapshot.
Q1) F15 ASD 11000' (that's actually the full runway length)
F20 ASD 10039'
(Gives me a 1000' margin at the end of a RTO with proper pilot technique)
Can I say F20 is a more desirable departure compared to F15?
(Let's ignore the given benefit margins in calculating ASD)
Q2) F20 MIN V1 (obstacle limited) is 149 kts
Actual V1 used as per company policy was 160 kts
Can I say if I had an engine failure at 155 kts and I don't REJECT I will still meet all my obstacle clearances from lift off end? (Assuming Single engine acceleration from 155kts to V1 & Then to V2)
Q3) what other benefits (if there are any) can be used if I use a F15 or F20 departure?
Q4) what does MAX V1/VR speed mean? Should this info be used to determine what flap setting would be better ?