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Lowering landing gear whilst enroute?

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Lowering landing gear whilst enroute?

Old 5th Apr 2023, 01:32
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I refer to myself as SLF on these hallowed pages, I'll give myself a stern lecture on the derogatory usage.
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Old 5th Apr 2023, 10:46
  #22 (permalink)  
 
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I think there's a cohort of non-pilot aviation enthusiasts who are happy to be "SLF", but I suspect your average Joe boarding at the gate might take some offence. Like many things in life, context and intent play a big roll, know your audience.
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Old 5th Apr 2023, 16:19
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Hot Brakes. ECAM says put the gear down to cool them.

Was the taxi out long? BCN for example?

High temperature airport? Southern Hemisphere?

No brake fans in the 320? Older aircraft?
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Old 5th Apr 2023, 18:48
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Originally Posted by UnderASouthernSky
How easy is to be over Max Landing Weight in an A320 after a 4 hour sector?
Flight time is not the problem, max payload is, many times combined with high diversion fuel requirements (I've had it on 1 hour flights and 4 hour flights, always freighters with max payload). Close to max payload, there is not much difference between MZFW and MLW. Any excess fuel because of ie shortened SID or big shortcuts will quickly make you "gain" the 200kg and make you overweight on the short sector. A short gear down is a quick and efficient solution. On longer flights it's much more fun to activate the afterburner and fly barber pole, or descend to very un-optimal flightlevels over longer periods.
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Old 5th Apr 2023, 20:44
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Originally Posted by BraceBrace
Flight time is not the problem, max payload is, many times combined with high diversion fuel requirements (I've had it on 1 hour flights and 4 hour flights, always freighters with max payload). Close to max payload, there is not much difference between MZFW and MLW. Any excess fuel because of ie shortened SID or big shortcuts will quickly make you "gain" the 200kg and make you overweight on the short sector. A short gear down is a quick and efficient solution. On longer flights it's much more fun to activate the afterburner and fly barber pole, or descend to very un-optimal flightlevels over longer periods.
Wasting company fuel man.
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Old 5th Apr 2023, 21:50
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Originally Posted by k.swiss
Wasting company fuel man.
This is required to not exceed max landing weight. The fuel was wasted at the planning stage using a (usually) standard route, not expecting the shortcut.

What I'm wondering (having done this a few times myself, in a different type) why not burn the fuel using something more pedestrian like the spoilers, rather than the landing gear?
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Old 7th Apr 2023, 23:17
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Originally Posted by Vessbot
This is required to not exceed max landing weight. The fuel was wasted at the planning stage using a (usually) standard route, not expecting the shortcut.

What I'm wondering (having done this a few times myself, in a different type) why not burn the fuel using something more pedestrian like the spoilers, rather than the landing gear?
Or plan to land with less than 200KG from the landing weight. That will ensure any shortcut does not require more drastic measures.

Gear down will burn a lot more than spoilers.
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Old 8th Apr 2023, 03:39
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Originally Posted by k.swiss
Or plan to land with less than 200KG from the landing weight. That will ensure any shortcut does not require more drastic measures.
You'd think that would be the obvious thing to do, but we get flight plans with the aircraft at MTOW, MLW and minimum fuel for the trip. No leeway to reduce fuel anywhere. This includes squeezing everything. Closest alternate; 3% ERA, shortest SID/STAR and at times planning for straight in/out runways.

So if the tailwind is good, or you get a few directs, or even asked to fly slow for separation, you end up a few kg overweight on landing.. hence configuring early just to land at MLW

Last edited by J.L.Seagull; 9th Apr 2023 at 03:04.
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Old 8th Apr 2023, 12:13
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Originally Posted by k.swiss
Gear down will burn a lot more than spoilers.
Just a question of time interval...

A spoiler is a flight control used to turn the aircraft. You can do a full flight gear down, but not spoilers up. I invite you to fly spoilers out for a couple of minutes, even making turns, or in turbulence,... I’m pretty old school and prefer to completely avoid spoilers in turns.

So you speed up, descend early or get the gear out. Flying around with the spoilers extended for minutes is not my prefered choice.
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Old 8th Apr 2023, 12:37
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Originally Posted by k.swiss
Wasting company fuel man.
Try taking extra payload equal to your contingency fuel. Greta would be so pleased..
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Old 10th Apr 2023, 12:00
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Originally Posted by J.L.Seagull
You'd think that would be the obvious thing to do, but we get flight plans with the aircraft at MTOW, MLW and minimum fuel for the trip. No leeway to reduce fuel anywhere. This includes squeezing everything. Closest alternate; 3% ERA, shortest SID/STAR and at times planning for straight in/out runways.

So if the tailwind is good, or you get a few directs, or even asked to fly slow for separation, you end up a few kg overweight on landing.. hence configuring early just to land at MLW
Fair enough man, sounds interesting.
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Old 12th Apr 2023, 07:01
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Another reason to potentially extend landing gear (though not so late in cruise), is for a brake temp warning, usually caused by:

1. Dragging brakes (on taxi/takeoff)
2. In an aircraft with brake fans, the indicators show a significantly lower than actual temperature when the fans are on, so when they get switched off, the indicated temperature spikes up, to the real temperature. (In my sim, its around 120-150 Celsius, the temp. spike)

You can potentially anticipate this, to keep the LDG extended for a little more while, performance permitting, of course. Otherwise, a nice lil ECAM warning reminds you to do so (it waits until T/O Inhibit is cleared).
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Old 19th Apr 2023, 21:37
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Originally Posted by ScepticalOptomist
Not a derogatory term - just a reference to passengers. See also “Punters”.
. Meats&Cheeses
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Old 20th Apr 2023, 02:43
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Originally Posted by AerocatS2A
I think there's a cohort of non-pilot aviation enthusiasts who are happy to be "SLF", but I suspect your average Joe boarding at the gate might take some offence. Like many things in life, context and intent play a big roll, know your audience.
To be fair the “average Joe” is offended by anything these days.
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