A320 QNH Correction to V2
https://cimg8.ibsrv.net/gimg/pprune....bc5ef808fa.png
Can someone please throw some light on this, thanks. |
It must be a printing error - you can't have V2 below VR.
If you look at the corrections published for -10 Kts and +10 Kts, they show only -1 Kt correction which makes the results sensible. |
Maybe for flat earth only:rolleyes:
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Originally Posted by Haroon
(Post 10474155)
https://cimg8.ibsrv.net/gimg/pprune....bc5ef808fa.png
Can someone please throw some light on this, thanks. |
Originally Posted by Goldenrivett
(Post 10476581)
It must be a printing error - you can't have V2 below VR.
If you look at the corrections published for -10 Kts and +10 Kts, they show only -1 Kt correction which makes the results sensible. https://cimg8.ibsrv.net/gimg/pprune....4845b6cadc.png https://cimg9.ibsrv.net/gimg/pprune....627d1bc59e.png |
Originally Posted by joe falchetto 64
(Post 10476766)
To have the proper answer you must check the Maximum Permissible Take Off Weight for the airport and runway in use. After that compare the speeds . Remember that no correction on speeds is required if applying bleed and qnh correction to flex take off. Refers to PER-TOF-TOC-20–10 P 5/14 “Correction produced on the RTOW chart” para 2 last sentence. |
Hi,
the reference is in PER-TOF-TOC-12-10 P 5/14 (TEMPERATURE ENTRY). (...)Check that the resulting speeds are higher than the minimum speeds displayed on the RTOW chart and that V2 is higher than the VMU limited speed (Refer to PER-TOF-TOD-25-20 MINIMUM V2 LIMITED BY VMU/VMCA (KT IAS)). (...)If OAT is higher than TVMC (line 3) or if the above speed check is not fulfilled, apply ΔW correction from line 3 and ΔV1/ΔVR/ΔV2 corrections from line 4. No speed check is required. Your speed are 149/150/151. |
Hi
Originally Posted by sonicbum
(Post 10477211)
Hi,
the reference is in PER-TOF-TOC-12-10 P 5/14 (TEMPERATURE ENTRY). (...)Check that the resulting speeds are higher than the minimum speeds displayed on the RTOW chart and that V2 is higher than the VMU limited speed (Refer to PER-TOF-TOD-25-20 MINIMUM V2 LIMITED BY VMU/VMCA (KT IAS)). (...)If OAT is higher than TVMC (line 3) or if the above speed check is not fulfilled, apply ΔW correction from line 3 and ΔV1/ΔVR/ΔV2 corrections from line 4. No speed check is required. In any case the min V speeds on that chart are: https://cimg3.ibsrv.net/gimg/pprune....9c5cbd81dc.png which are way below. Your speed are 149/150/151. |
Haroon, you need to check with your Flight Operations Engineering department, and they probably with Airbus.
It makes no sense, and I think the explanations provided so far are valid for something else than you asked about. To reiterate my understanding of your original question: In case you needed to apply the speed corrections for low QNH, the resulting V2 is invalid. How come? |
Originally Posted by FlightDetent
(Post 10477563)
Harpoon, you need to check with your Flight Operations Engineering department, and they probably with Airbus.
In case you needed to apply the speed corrections for low QNH, the resulting V2 is invalid. How come? I would be grateful if some A320 pilots could have a quick glance in their books to see if they could find similar sort of stuff. Thanks. |
Originally Posted by Haroon
(Post 10477672)
Thanks, I guess so.
That's correct. I would be grateful if some A320 pilots could have a quick glance in their books to see if they could find similar sort of stuff. Thanks. |
Thank you. Query already sent, lets see what do they have to say.
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Originally Posted by Haroon
(Post 10477700)
Thank you. Query already sent, lets see what do they have to say.
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Originally Posted by sonicbum
(Post 10477726)
Cheers. Let us know the answer.
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Will share with all :)
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The reply was:
"Software is designed to calculate Charts including speeds and corrections separately. After applying corrections if V2 decreases from VR then apply the basic performance rules and take V2 equal to VR." |
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