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27th Feb 2011, 14:02

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WhiteKnight

Join Date: Apr 2004

Location: Kappis

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Approach speed A320 with unreliable airspeed

Hello,

i just got a question regarding Vapp for an unreliable airspeed event in an
A320.

According the QRH there is one line which says the "APP SPD" is VLS +10 with LDG CONF 3.
If you look in the table for LDG CONF/APPR SPD/ LDG DIST on DRY RUNWAYS for Unreliable Speed it gives you a "delta" VREF of 16.

My Question is now, which value du you enter in the MCDU as your Vapp.

Let´s say your flight plan is sequenced you see a VLS of 115 on the MCDU.

VAPP = VREF+ "delta"VREF+ APPR COR

Is my VREF now: VLS(115)+10?

and VAPP = 115+10+16+APP COR?

Any advise of how to handle the extra 10 knots given in the QRH would be great. Thank you

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