Technique for the Approach mode (A320)

[Michael Moe 495]

Hi , Would like to know real world routines about the approach mode in the A320.

What is the normal behaviour/routine for this ? I normal fill in the approach page just after descend is engage.

What is considered normal after ?

I do have alot of manage speed still going to 250 knots(while at 180knots) on approach simply because it never has triggered the approach mode (ND says ILSXX on top) even with both "LS" on. Offcause hitting the activate approach in the MCDU works but i was under the impression that the aircraft could activate this by itself.

Thanks

Michael Moe

Edited May 27, 2022 by Michael Moe

[ah2511 49]

Airbus by default aims for what they call a “decelerated approach” - ie S speed (~180kt) at the FAF. The default DECEL point is based on this.

In some cases you may want to opt for a stablilised approach. That is v app at the FAF.

There is a great video from Blackbox on this https://youtu.be/enlMh4CaemI

[Michael Moe 495]

7 minutes ago, ah2511 said:

Airbus by default aims for what they call a “decelerated approach” - ie S speed (~180kt) at the FAF. The default DECEL point is based on this.

In some cases you may want to opt for a stablilised approach. That is v app at the FAF.

There is a great video from Blackbox on this https://youtu.be/enlMh4CaemI

Yeah  , and thanks but why does the airplane go for 250 knots  hitting the manage speed from 180/ flaps 1? It must be something on my end i guess. What can be done to activate approach mode automatic ? 

whats the demand/requirement for going from descend mode to approach mode ?

Michael Moe

Edited May 28, 2022 by Michael Moe

[MWJ81 11]

1 hour ago, Michael Moe said:

Yeah  , and thanks but why does the airplane go for 250 knots  hitting the manage speed from 180/ flaps 1? It must be something on my end i guess. What can be done to activate approach mode automatic ? 

whats the demand/requirement for going from descend mode to approach mode ?

Michael Moe

I think this is a bug (not respecting previously set speed limits on approach). I've submitted a support request for Fenix to have a look.

[suncoastflyer 685]

3 hours ago, ah2511 said:

In some cases you may want to opt for a stablilised approach. That is v app at the FAF.

 

I thought every approach should be a stabilised approach but it has nothing to do with your speed at FAF. Is this a different stabilised approach than what is normally talked about?

[captain420 3,099]

Isn't the activate approach mode in the MCDU suppose to activate automatically once your plane reaches the decelaration point on the ND? I feel like that decelaration point is a bit late. By the time my plane hits that point, it's about 10-15nm away from the runway. At least in the FBWA320NX, I recall that it was automated but not in the fenix, unless it's a bug.

[DescendDescend 25]

For the Approach Phase to activate automatically the D must be magenta. If  it is white it will not activate automatically. If you cross D with speed selected rather than managed it will be white.

For destination data there is usually a scratchpad reminder well before T/D.

[tup61 1,562]

You are the pilot and you are in command. If you feel the decel point is too late take command and manually activate the approach. 

Having said that: the decel point is too late quite often and afaik real world pilots usually enable approach mode themselves earlier on. You might regard the automated approach mode as a safety measure. I seldom let the plane activate approach mode and rather do it myself. 

Edited May 28, 2022 by tup61

[Kopteeni 819]

I just work out from the arrival and approach charts when I would roughly like to be  at green dot speed, then I will activate the approach some 5-10 nm before this point depending on what the VNAV is doing prior to my GDS target. Some of the stuff I factor in are speed constraints, approach type, glide slope angle. I find it's a very dynamic thing, especially if you also fly with the ATC in Vatsim who might also give you a speed target.

I think it's one of the things where you can get better at with experience. It's also very rewarding when you manage to completely nail your speed management, being very energy and time efficient without compromising the safety aspects.

[srce 57]

3 hours ago, suncoastflyer said:

I thought every approach should be a stabilised approach but it has nothing to do with your speed at FAF. Is this a different stabilised approach than what is normally talked about?

In the blackbox video, it's called an "early stabilised" approach. i.e you're stabilized at the FAF rather than 1000ft.

[srce 57]

7 hours ago, Michael Moe said:

What can be done to activate approach mode automatic ? 

whats the demand/requirement for going from descend mode to approach mode ?

You need to be in NAV or APP rather than HDG SEL over the decel point. The decel point will be in purple rather than white on the ND. See the video above.

Edited May 28, 2022 by srce

[Cpt_Piett 4,645]

I usually manually activate approach mode when I’m ready to decelerate to the green dot speed. Then I extend flaps so that I’m at flaps 2 just before glide slope capture. 

[Michael Moe 495]

2 hours ago, srce said:

You need to be in NAV or APP rather than HDG SEL over the decel point. The decel point will be in purple rather than white on the ND. See the video above.

Are there you go. I was getting vector from ATC both times when it raised the speed to 250 hitting manage speed at IAF. Approach page was filled in way before during descend but approach mode did not kick at 180 knots which then seems to be notmal in HDG SEL then.

Michael Moe 

Edited May 28, 2022 by Michael Moe

[Fiorentoni 4,224]

50 minutes ago, Michael Moe said:

Are there you go. I was getting vector from ATC both times when it raised the speed to 250 hitting manage speed at IAF. Approach page wad filled in way before during descend but approach mode did not kick at 180 knots which then seems to be notmal in HDG SEL then.

Michael Moe 

Yep it's a good reminder to activate approach phase as soon as you are vectored off your path or get ATC speeds. It's really only automatic when you fly the whole VNAV route as published, which is rather rate in real life and on vatsim.

[flyingpauls 66]

The APPR page should be filled before the DES starts, because this information is used to plan the approach by the FMGC. The APPR phase will be initiated in managed descend at a point computed by the plane. I find the Fenix A320 is sometimes off here, and the plane needs drag. In any case, you can activate the approach phase once you fly in selected speed. Then go back to managed to green dot.