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.

Kindly provide source reference for your Airbus HOT tables.

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?

146 pages! Could you narrow that down for us First.officer?

No need. That document explains the fluids,as it should. What an excellent source (same as the IATA De-Icing guidelines) but logically no reference to any specific plane let alone configuration.

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.

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.

Source is FAA Holdover Time Guidelines - Winter 2022-2023 replicated in Company OMC.

Thank you for asking.

Thank you good people for your input, very much appreciated.

Apologies. If anyone needs to look for a moronic post of the week #2 in this thread would do.


The second thing I learned here:
https://cimg4.ibsrv.net/gimg/pprune....4fffe5bbe6.png


We do deice clean with the current and all previous operators (to give back a bit)