De-Ice 'Clean or S/Flaps' Holdover Time Option
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De-Ice 'Clean or S/Flaps' Holdover Time Option
Quick Question please.....
Choice of De-Ice 'Clean or S/Flaps' Holdover Time Option
This is Reference A320 HOT table options. Why are there clean config tables? Am trying to understand the logic of this, I can guess but am interested if there are any informative answers.
Thank you for any response.
Choice of De-Ice 'Clean or S/Flaps' Holdover Time Option
This is Reference A320 HOT table options. Why are there clean config tables? Am trying to understand the logic of this, I can guess but am interested if there are any informative answers.
Thank you for any response.
I'm guessing FlightDetent, that the tables might well be these;
https://www.faa.gov/sites/faa.gov/fi...overTables.pdf
Does Airbus approve all of these fluids as listed?
https://www.faa.gov/sites/faa.gov/fi...overTables.pdf
Does Airbus approve all of these fluids as listed?
Only half a speed-brake
EDIT: no excuses, really.
What the OP may be alluding to is that the OEM does not specify or verbosely prohibit wing de-icing with surfaces extended.
The way the manual is structured [PRO-NOR-SUP-ADVWXR "A" AIRFRAME DEICING/ANTI-ICING PROCEDURE ON GROUND], the described procedure does not connect to the normal flow of activites pre-start or after-start in the crew SOP section. Given the high level of integrity and consistency of the OEM FCOM, this non-embedding raises questions and is one of the weak links.
However, drawing a conclusion that de-icing during taxi is done with flaps out might be perilous.
Last edited by FlightDetent; 22nd Nov 2022 at 18:25.
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If you know your surfaces are clean, or that you've not operated on a contam surface and the flaps have been stowed the whole time when exposed to contam then de-icing and then anti-icing with flaps up/retracted is logical - the "hidden" parts of the system are clean, and by doing it flaps up you get a longer holdover time.
If you however suspect contam on the parts of the flaps which would be "hidden" when retracted then deploying the flaps to de-ice is pretty much a given, it's the only way to clean the flap leading edges etc. You may then anti-ice in that config (but you'll take a penalty on HOT) or retract first to anti-ice. If you're doing one-step combined anti-ice and de-ice of course, the flaps will have to be down.
NB generic comments, not Airbus-specific.
If you however suspect contam on the parts of the flaps which would be "hidden" when retracted then deploying the flaps to de-ice is pretty much a given, it's the only way to clean the flap leading edges etc. You may then anti-ice in that config (but you'll take a penalty on HOT) or retract first to anti-ice. If you're doing one-step combined anti-ice and de-ice of course, the flaps will have to be down.
NB generic comments, not Airbus-specific.
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Only half a speed-brake