Airbus high speed protection
What happens if in the cruise (auto pilot engaged) you apply TOGA thrust? High speed protection should engaged and auto pilot disengage....nose pitch up to prevent overspeed? Then what eventually reduces the thrust, assuming it's left in TOGA?
Thanks |
Hi
I dont know any engine protection which would reduce to mct. However, the high speed prot will induce a climb to reduce speed |
TOGA is TOGA and there's nothing the A/Thr can do about it.
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Setting TOGA after FLX/MCT a/thr will disconnect and revert to armed , i think protection will add nose up a/p disconnect ,with TOGA until power is manually reduced , in this scenario.
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won't disconnect but will become armed from active and will remain so.
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Not sure about Airbus (although I'd be mildly surprised if it's different), but on Boeing TOGA isn't defined outside of the Takeoff envelope (above 250 knots and 15k-17k altitude, depending on the aircraft model).
Above that, full forward throttle gives Max Con. |
Hi
Nothing happens, except for toga flashing in white. |
Originally Posted by SADDLER
(Post 9570787)
Hi
Nothing happens, except for toga flashing in white. |
Maybe he ment LVR CLB? With A/THR armed, it is not beyond my imagination ...
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Hmmm
As as far as I can remember it was toga flashing in white. Could be wrong. |
Then what eventually reduces the thrust, assuming it's left in TOGA? |
Originally Posted by FlightDetent
(Post 9571131)
Maybe he ment LVR CLB? With A/THR armed, it is not beyond my imagination ...
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Originally Posted by roofdog
(Post 9568517)
What happens if in the cruise (auto pilot engaged) you apply TOGA thrust? High speed protection should engaged and auto pilot disengage....nose pitch up to prevent overspeed? Then what eventually reduces the thrust, assuming it's left in TOGA?
Thanks |
tdracer
but on Boeing TOGA isn't defined outside of the Takeoff envelope (above 250 knots and 15k-17k altitude, depending on the aircraft model). Above that, full forward throttle gives Max Con. |
lever climb to flash you need THR RED altitude. It cannot happen at in cruise phase. Whenever the A/THR is armed and the TLs are not in the CLB detent, you'd get told by the aircraft they're not where expected. The first instance is passing ACC ALT in after take-off, indeed. |
FlightDetent
Oh yes it can. DSC-22_30-100 "B" LVR CLB flashing white - Request to set the thrust levers in CL detent in the case not in position while the aircraft is above the altitude of thrust reduction with both engines running. |
Originally Posted by vilas
(Post 9572126)
FlightDetent
The discussion is about cruise phase with thrust levers in TOGA. You have transited TO phase and you are not in GA phase. There is no thrust reduction altitude in cruise.The statement you have quoted is not applicable in cruise phase. |
I may be wrong but I thought I read somewhere that Airbus modified the logic in the A380 and A350 and overspeed protection on these aircraft does reduce thrust automatically.
Can anyone confirm this or tell me I'm wrong? |
Up to A330 when ATHR is blue there is no protection. But with ATHR active may be in THR CLB or THR IDLE and if you do not fly FDs properly and speed reaches either MAX speed or drops below VLs the FMA is removed and ATHR reverts to speed and managed speed target changes to selected to recover the speed.
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Up to A330 when ATHR is blue there is no protection |
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