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View Full Version : AoA indicator


Arturito
12-28-2018, 03:56 PM
Hello everyone !


1. Wouldn't it be a good idea (for safety and "airplane awareness") to have mandatory AoA indicator in airliners ?


I think it could help to avoid AF447 style accidents and probably other 'close call' we dont hear about.


2. Why don't airliners fly approaches following a fixed AoA like the military ?

I feel like it's a more reliable indicator than speed that can change depending on weight and CG.


Is it just because airlines dont want to spend $ for them ?



Bye


Adlerdriver
12-28-2018, 06:40 PM
We already have them in the HUD.

JohnBurke
12-28-2018, 07:35 PM
Some aircraft provide a cockpit indication. Most transport category aircraft use AoA input which is translated to the cockpit information in one form or another. It may not always be displayed as angle, but may be had in other forms, such as a pitch limit indicator, which is an indirect reference to AoA.


Airbum
12-29-2018, 05:50 AM
Boeing published :

Aero 12 - Angle of Attack (http://www.boeing.com/commercial/aeromagazine/aero_12/attack_story.html)

I like AOA, but then I used it a lot. Wish my current aircraft had one.

cougar
12-29-2018, 04:16 PM
For aircraft with a Flight Path Vector (FPV) available on the PFD, the AOA can be determined as the degrees from the pitch indicator to the FPV. For example, on final, the pitch for the 747-400 is typically 1 to 2 degrees when on speed. The FPV will be at -3 degrees, therefore the AOA is 4 to 5 degrees.

galaxy flyer
12-29-2018, 06:37 PM
For aircraft with a Flight Path Vector (FPV) available on the PFD, the AOA can be determined as the degrees from the pitch indicator to the FPV. For example, on final, the pitch for the 747-400 is typically 1 to 2 degrees when on speed. The FPV will be at -3 degrees, therefore the AOA is 4 to 5 degrees.

That would give the angle between the fuselage reference line and the flight path, while close to AoA, not identical. Angle of incidence is a factor.

GF

cougar
12-30-2018, 03:27 PM
Angle of incidence is nominal, at least regarding Boeing aircraft. Thus the difference between pitch and FPV as AoA is from Boeing's own discussion on AoA: http://www.boeing.com/commercial/aeromagazine/aero_12/whatisaoa.pdf



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