A320 Dual HYD question

[virgin camel]

quick ? to all tech boffins

Example: A320 60T Green and Blue Dual Hydraulic Failure.
I want to workout my Landing Distance so into the QRH on a RWY with GOOD breaking action. (FPE-IFL-29)

Left Column says: G+B
REF DIST calculated with
140kt min

I appreciate this speed is for the Min Rat speed.However at 60 T Vref is 130 and Delta Vref is 25 giving me 155 Kt Vapp.
SPD increment says N/A. (disregard ALT,WIND, TEMP,SLOPE,REV.)
Ref distance is calculated for 140 Kts and 66T..Ok so youmake the adjustment for the 60T but your carrying 155-140= 15 Kts extra speed.
How di I get a REF DIST for 155 Kts?
Anyone?
Airbus totally unintuitive….or I am missing something (probably)...

Thanks to anyone.

[Cough]

The ref distance is for 66T, so your 60T landing would mean less speed.... No increase in speed... No correction...

Each +5kt is for extra increments over and above the +25 kt, so as long as you factor the weight, as I understand it thats it!

[virgin camel]

Cheers cough

Still puzzled...

Ok...let's say the weight is now 66 ton..we now have vref136 and delta ref +25
Giving a vapp of 161..

I am still waiting for that airbus moment of clarity to hit me.

Spd increment for this failure is NA...

[Cough]

The landing distance as published assumes 161kt. The +5kt only applies if you come down final at 166kt. However, above 20kt above Vref you shouldn't be adding any extra so this column shows NA. There is a reference to this inVapp determination with failure, in the approach correction box.

[virgin camel]

Cheers for that...
I think that's ironed out that crease.
Appreciate the replies.

[Old Smokey]

If Airbus were to write bomb disarming manuals, it would go something like this -

First Line - CUT THE RED WIRE

Then a few acres of words, followed by -

Last Line - Be sure to cut the blue wire first.

Best Regards,

Old Smokey