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N965UW
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Airbus lights question

Sun Feb 14, 2021 7:51 pm

I understand how the Airbus family has a combined "NAV/LOGO" switch that operates both the nav and logo lights. On the A320 (day or night), the logo lights come on when the landing gear is compressed (i.e. on the ground) and when the slats are extended.

But looking at the A330/A340 FCOM, its logo lights don't come on unless the flaps are extended at least 15 degrees. Looking at the flaps settings chart, they don't reach 15 degrees until lever position 3 (although Flaps 1 puts the slats at 16 degrees). Since nearly every A330 night takeoff I've seen had logo lights on, does this mean that Flaps 3 is the most common takeoff setting, or did the FCOM use the words "flaps" and "slats" interchangeably?

Also wondering if the relatively newer A350 and A380 work in the same way.
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jjairbus
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Re: Airbus lights question

Sun Feb 14, 2021 8:34 pm

Checking from the A330 FCOM it actually states that logo light is on when "the main landing gears is compressed, OR depending on the aircraft configuration, when flaps are extended (at least 15 ° on some aircraft)".

So as long as the landing gear is compressed the logo light should stay on. However I don't know what will happen after takeoff when landing gear is not compressed anymore. In A320 logo light stays on until slats are retracted however A330 FCOM doesn't mention that slats position would affect logo light.
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Starlionblue
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Re: Airbus lights question

Mon Feb 15, 2021 12:19 am

The A350 has a separate LOGO light switch, with three settings.
- ON - Logo lights are on.
- AUTO - Logo lights come on if aircraft on the ground or in flight with slats extended.
- OFF - Log lights are off.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
N965UW
Topic Author
Posts: 216
Joined: Wed Jul 29, 2020 11:31 pm

Re: Airbus lights question

Tue Feb 16, 2021 2:13 pm

jjairbus wrote:
So as long as the landing gear is compressed the logo light should stay on. However I don't know what will happen after takeoff when landing gear is not compressed anymore. In A320 logo light stays on until slats are retracted however A330 FCOM doesn't mention that slats position would affect logo light.


There's no evidence I can find from any planespotters or Youtube showing the A330's lights shutting off after the gear lifts off. Which leads to two logical conclusions: they're all Flaps 3 takeoffs or it's really based on slat position.

Starlionblue wrote:
The A350 has a separate LOGO light switch, with three settings.
- ON - Logo lights are on.
- AUTO - Logo lights come on if aircraft on the ground or in flight with slats extended.
- OFF - Log lights are off.


Interesting, that fixes the problem of the logo lights coming on in the day when nobody can see them!
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jjairbus
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Re: Airbus lights question

Tue Feb 16, 2021 5:57 pm

N965UW wrote:
There's no evidence I can find from any planespotters or Youtube showing the A330's lights shutting off after the gear lifts off. Which leads to two logical conclusions: they're all Flaps 3 takeoffs or it's really based on slat position.


So it seems. I'm guessing it's the latter one but I don't fly the A330 so I don't know how common it is to takeoff with flaps 3. And also I don't know what that "at least 15 degrees on some aircraft" remark actually means, maybe it can also be something else.
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Starlionblue
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Re: Airbus lights question

Tue Feb 16, 2021 11:55 pm

jjairbus wrote:
N965UW wrote:
There's no evidence I can find from any planespotters or Youtube showing the A330's lights shutting off after the gear lifts off. Which leads to two logical conclusions: they're all Flaps 3 takeoffs or it's really based on slat position.


So it seems. I'm guessing it's the latter one but I don't fly the A330 so I don't know how common it is to takeoff with flaps 3. And also I don't know what that "at least 15 degrees on some aircraft" remark actually means, maybe it can also be something else.


I can only speak from my own experience, but I can't remember ever seeing a Flaps 3 takeoff in the A330.

The FCOM says that logo lights come on when the main gear is compressed, and "depending on aircraft configuration", when flaps are extended.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo

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