AIRBUS Dual RA fault & Flight control laws

[vilas]

At my last company, the only suggestion was to select landing flaps before extending the gear, so as to have normal law do as much of the trimming as possible.

This is debatable. When you do that you get a uncancelable gear up warning for a good reason. Using EMER CANCEL you are setting your self for Gear up landing. I wouldn't do that just to postpone direct law for 30 seconds. Besides whenever you lower gear the trim will change because thrust will change which has to be trimmed manually. So what's the point?

[vilas]

Hence for dual RA, unlike in G+Y HYD where the summary advises the swap, standard sequence would be used.

Very true. There are only two exceptions to standard sequence. Both with double hydraulic. First in G+Y because if you drop gear at higher speed then when you reduce to Vapp the last elevator position will let the nose drop. So you will be flying with stick held backwards out of neutral. This reduces available side stick movement to raise the nose to 15° should you go around. Second is G+B where gear has to be lowered first before 200kts for better controllability with half elevator then configure all the way to three.

[sonicbum]

Originally Posted by FlightDetent

Huh, an old leash scar on top of my left hand just opened up reading this, sweet memories of Toulouse. "Merci(*), what on Earth stops you from landing gear up after cancelling it?!"

Further study of the FCOM ABN L/G for that warning shows there's logic specifically designed to ensure with DUAL RA the bells go off with L/G UP and F3.

For landing F3: MSN 7000+ both CEO and NEO in our library have that for the landing.

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* I am sure with the first syllable "mer", the following one not too much.

Hehe exactly, that's the Toulouse style :-) Anyway for all the "EMER CANC" lovers the FCOM DSC-31-30 states :

Note: This pushbutton should only be used to suppress spurious MASTER CAUTIONS.

[Bahruz]

Originally Posted by FlightDetent

Yes, LOC+FPA. The A/P should not be left engaged too long (it is written), however. Then FD=off.

Good luck with your training, enjoy the aeroplane!

Thanks a lot)