Remake and the posts of two pictures are approved by the mods
Since I found that the previous thread was dirty (Broken links…), I decided to rework it, (it was my first request)
Anyway, let’s start:
What is the A32F Whistling sound?
It is a characteristic sound like a flute that is only produced on the Airbus A320 Family.
It is happening when the aircraft is in approach, at an altitude from 100/200 (GS must be superior to 150 kts) to 8000 feet, when the ground speed is between 130 to 300 (or 295) kts.
We can hear the sound when the aircraft is at 3, 4 kilometers from us.
The sound is also produced during takeoff and go around.
Here is an example of an whistling A320:
Video by @AvioesEJogos
Why does the sound is produced?
It is caused when air passes trough four holes, these holes are located under the wings of the aircraft, they are called: FOPP (Fuel OverPressure Protector)
It is like when we blow on an empty plastic bottle.
One of the four FOPP of a British A320
Before, I’ve heard this sound many times, but now, it’s rare, why?
It’s because, many people who lives near Airports have been complained a lot about this sound, so airlines have prepared actions against this sound (they needed to find the origins of the sound)
In the end of 2013, the German airline, Lufthansa introduced the first A320 with a tiny device, which is called, a Vortex Generator (or Air Flow Deflectors)
This device is placed in front of the FOPP, creates a “small whirlpool” for air, so this device blocks air passing through the four holes = the Whistle is not produced.
An FOPP with a Vortex Generator
The Air Flow Deflectors have been developed by the UK aircraft Engineering, SuperCraft, the German Aerospace Centre and Lufthansa.
With the VGs installed, A32F’s noise are reduced by four decibels.
Airbus A32F made after the late-2014 (A320Neo Family are included) have the Vortex Generators installed by default.
The older models (the pre-late-2014s) can be retrofitted during a maintenance.
After the introduction of the Vortex Generators, which airlines decided to follow Lufthansa?
Many European airlines, like Air France, British Airways, easyJet, decided to follow it by installing VGs in all of theirs A32F fleet.
Condor, Aer Lingus, TAP, Volotea, Vueling also installed VGs in theirs A32F.
In the US:
JetBlue is planning to retrofit them by the end of 2021
United also proceeded in 2017
Why I want it in IF?
I want the A32F whistling sound in IF, because it will increase Realism even if majority of them are retrofitted, but it doesn’t matter to me.
I always loved this noise since I was very young.
I my opinion, it should come as a Setting option
Comparison: A32F with VGs vs without VGs
With Vortex Generators:
This noise is caused by the Speed Brakes
The Whistle on the A321 is quite different compared to the A318, A319 and A320:
- The sound without Vortex Generators
- The sound with Vortex Generators