747.400 Vmca?
:confused: As I do not know anythings about 747.400 is there any nice boeing pilot to answer thse terrible questions for me?
What is higher Vmcg or Vmca on B 747/400? ( I never imagined it could be something else than vmcg<vmca, but...) Is there any interrest to teach young student Vmca on airplane rather than simulator? Thanks to those who could alight my brain!:cool: |
vmca
as far as i believe this is a Cathay question.
i did ask a lot of guys, and all comfirmed that Vmca is always higher, in all airplanes , if i am wrong plz let me know, Thanks Windtalker.:zzz: |
747-400:
VMCG 118 - 124 kts VMCA 112 - 117 kts 1 Engine Out 152 - 160 kts 2 Engines Out Very simply, VMC calculations generally allow for a slight bank into the live engine. Obviously you cannot bank while still on the ground, you only have rudder, so the VmcG is slightly higher than Vmca1. |
Capt Fathom
Please advise if the IASs have been determined after the customary 2 seconds delay following failure before intitiating recovery action. |
Vmca is always higher, in all airplanes There is nothing which requires that Vmca be either smaller or larger than Vmcg. They are the result of different manoeuvres/tests, at rather different aerodynamic conditions. Therefore there is no way you can point at a single factor and draw the conclusion that one or other must be larger. It doesn't even have to be consistent on a single airframe for two different flap configurations. |
Milt,I 'm possably confused but to recover from VMCA is Immediate(once one runs out of rudder control)...
The only time the 2 seconds apply is in the ASDA DISTANCE evaluation...NOT in the recognition/reaction by V!.... Or am I totally at sea??? Cheers:ok: |
oldebloke
The reason we TPs use a 2 second delay is to account for an 'average' reaction time to a rapidly deteriorating situation. This is based on the 'slower reactors' in the system. If you can beat the 2 seconds you are getting up there towards the above average. Of course in determining a reasonable Vmcg things can get decidedly pear shaped!! |
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