View Full Version : A320 Turbulence Margin to VLS / MMO

18th Mar 2010, 13:01

What does airbus recommend when it comes to turbulence margin to VLS and MMO during cruise? How much margin should I use?

18th Mar 2010, 13:18

There's some guidance in QRH 5.01.

18th Mar 2010, 13:51
Hi Founder,
the margin is definitely matched by flying at or below the turbulence penetration speed:
A319/A320 below 20.000 ft = 250 KIAS
// at or above 20.000 ft = 275 KIAS/M 0.76

A321 below 20.000 ft = 270 KIAS
// at or above 20.000 ft = 300 KIAS/M 0.76

You'll find supplementary techniques for "Adverse Weather" in the QRH 3.04.91 from pp. 1 to pp. 5.

Happy Landings,
fredgrav ;)

18th Mar 2010, 17:46
If you PM me your email. I can send you a self-made PPT slideshow on this subject. Regards

19th Mar 2010, 21:36
I think I was a bit unclear about my question, I was not after the speed for penetrating turbulence... I'm more after the speed margin to VLS with regards to altitude.

For example, flying att FL330, OPT ALT is FL330, MAX REC 355. You'll have a margin of about 10-15 knots with a heavy A321 to VLS and about the same up to MMO.

Are these 10-15 knots enough or should there be more??