A320 AoA Display
Hi,
Reading an ATSB report on an A320 with unreliable airspeed near Perth, Western Australia AO-2015-107. [/QUOTE] In the A320, flight crew are able to examine the ADR angle-off attack values; however, they are not presented on the primary flight displays, and require the flight crew to access and display a page on the multipurpose control and display unit in the centre pedestal. In this occurrence, the flight crew discussed an angle of attack discrepancy, but for undetermined reasons did not access the angle of attack page to confirm the discrepancy. [QUOTE] How common is it to check the AoA in flight to troubleshoot an ECAM of NAV ADR DISAGREE ? How do you access this info ? FCOM have any guidance ? |
MCDU MENU/AIDS/ALPHA DISPLAY/AOA. It will then give you the respective AOA for each ADC. Its not an approved procedure, so I’m surprised that the ATSB have come to that conclusion. We used to have a list of all the ALPHA codes that you could display in the MCDU, but it’s long since been lost. |
MCDU MENU-AIDS-ALPHA CALL UPS - AOA
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Originally Posted by novice110
(Post 10457205)
Hi,
How common is it to check the AoA in flight to troubleshoot an ECAM of NAV ADR DISAGREE ? |
The suggestion of an Investigation Board that crew should have probed some raw data bus via what is essentially a maintenance system, while airborne during an abnormal which affected the primary flight instruments, is bizarre.
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Originally Posted by FlightDetent
(Post 10457399)
The suggestion of an Investigation Board, that crew should have probed some raw data bus via what is essentially a maintenance system, in flight and during an abnormal that affected primary flight instruments, is bizarre.
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In my company we cannot access those pages as per our SOPs, unless instructed by engineers on the phone. |
Originally Posted by vilas
(Post 10457417)
Surely! I doubt any commercial aircraft has AoA displayed on the instrument panel.
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Originally Posted by Denti
(Post 10457485)
First of all, it was displayed on A320s in the low 100 MSNs, so there is actually an example of the type in question, although not on the primary displays, but rather as an additional instrument.
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Aircraft is MSN 429. |
Thanks for the info all.
The report goes into much detail, worth a read for beginners like me. I believe it infers the crew should have accessed this maintenance function, without training or procedures to follow. Can you imagine the results if crews started using such unapproved functions, at the expense of ECAM and A-N-C, in a time critical unreliable airspeed situation ? |
The Back Up Speed System is a huge improvement, just keep the needle in the green.
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I don't think that anyone could reasonably expect a crew facing difficulty controlling a plane with unreliable airspeed to go digging to find AoA.
I agree with the above posters that it should be permanently displayed on the PFD. |
AOA indicator as well HUD was standard on IT (Air Inter) A320 however GPWS was surprisingly NOT!
Vous savez que le BEA a recommandé dans son rapport sur le Rio-Paris « l’installation d’un indicateur d’incidence sur tous les avions de ligne » Réaction des constructeurs : NADA ! |
AoA is there if you want to use it, via HUD if fitted or on the PFD if you use TK/FPA. What you could do is have a system that looks at the current AoA, and the stall AoA, and have a synthetic voice call out "STALL" if one exceeds the othe- oh, wait. If you're in any doubt about the situation, and it's shouting "stall", then do the stall recovery procedure. Otherwise set pitch and power memory items and WAIT until the situation stabilises. |
Not a fan of the BUSS, find it too sensitive, far prefer to set an attitude and power. |
Originally Posted by vilas
(Post 10458767)
With all three ADRs off the Flt Ctls are in alternate law. There is no reason for the aircraft to be any more sensitive than it is supposed to be. Now in A350 Airbus has come out with alternate speed calculation and backup speed. They have quadruple ADR redundancy( B737MAX has zero) and alternate speed calculation using AOA, load factor and weight which is fed into the lift equation to get back up speed which is compared with ADR speed. If there's a discrepancy between ADR speed the system will generate a warning and automatically change to back up speed. In future A 320 and A330 will have option of this. So with UAS all that apilot does is say thank you and ask for a coffee.
Now that I like! |
Originally Posted by vilas
(Post 10458767)
With all three ADRs off the Flt Ctls are in alternate law. There is no reason for the aircraft to be any more sensitive than it is supposed to be. Now in A350 Airbus has come out with alternate speed calculation and backup speed. They have quadruple ADR redundancy( B737MAX has zero) and alternate speed calculation using AOA, load factor and weight which is fed into the lift equation to get back up speed which is compared with ADR speed. If there's a discrepancy between ADR speed the system will generate a warning and automatically change to back up speed. In future A 320 and A330 will have option of this. So with UAS all that apilot does is say thank you and ask for a coffee.
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By the way I hope there will still be airlines where You don't have to pay for that coffee (ok I shut up) ;-)
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