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“Set standard”

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“Set standard”

Old 17th May 2019, 21:38
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“Set standard”

When departing under NADP1, in an A320, I was told not to set standard until reaching acceleration altitude. This often means reading back “climb FLIGHT LEVEL xxx” and then setting xx,000 and reading “xx,000 blue”, waiting until Acc. Alt to then set standard. Recently I had someone say that it doesn’t matter if you set standard before Acc. alt.

Anyone know definitively, and / or have a reference?

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Old 17th May 2019, 22:19
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FCOM says to set STD at transition altitude. Are you saying you want to set it early just so you can callout a FL display on the PFD?

What happens if ATC amend the climb instruction to level off below transition due traffic and you have STD already set ?
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Old 18th May 2019, 02:44
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If you’ve pre set your ACC Alt to say 3000’ then setting STD early will mean that the aircraft will now accelerate at FL030 which will be early or late depending on the QNH (unless of course it is 1013)
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Old 18th May 2019, 05:45
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Originally Posted by RUMBEAR View Post
FCOM says to set STD at transition altitude. Are you saying you want to set it early just so you can callout a FL display on the PFD?

What happens if ATC amend the climb instruction to level off below transition due traffic and you have STD already set ?

I wasn't saying I wanted to, I was saying that it seems others do!!

I
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Old 18th May 2019, 06:23
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Originally Posted by RUMBEAR View Post
FCOM says to set STD at transition altitude. Are you saying you want to set it early just so you can callout a FL display on the PFD?

What happens if ATC amend the climb instruction to level off below transition due traffic and you have STD already set ?
There is a school of thought that one should set QNH during descent as soon as one is given an altitude not at transition. A number of airlines follow this procedure.
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Old 18th May 2019, 13:24
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Originally Posted by Busdriver01 View Post
When departing under NADP1, in an A320, I was told not to set standard until reaching acceleration altitude. This often means reading back “climb FLIGHT LEVEL xxx” and then setting xx,000 and reading “xx,000 blue”, waiting until Acc. Alt to then set standard. Recently I had someone say that it doesn’t matter if you set standard before Acc. alt.

Anyone know definitively, and / or have a reference?

Set standard when passing transition altitude. Imagine You are departing passing 2000 ft the ATC says "Climb FL180" (no constraints) You will set 18000 ft and call "18000" blue. When passing the TA 18000 will become FL180. Now if You find some weirdo who says "Oh but ATC said to climb FL180 and the PFD says 18000" tell him there is no need to panic, to keep on breathing, and when passing TA You will call for set standard.
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Old 18th May 2019, 19:22
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Originally Posted by sonicbum View Post
Set standard when passing transition altitude. Imagine You are departing passing 2000 ft the ATC says "Climb FL180" (no constraints) You will set 18000 ft and call "18000" blue. When passing the TA 18000 will become FL180. Now if You find some weirdo who says "Oh but ATC said to climb FL180 and the PFD says 18000" tell him there is no need to panic, to keep on breathing, and when passing TA You will call for set standard.
CORRRRECT !!
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Old 18th May 2019, 19:34
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If you’ve pre set your ACC Alt to say 3000’ then setting STD early will mean that the aircraft will now accelerate at FL030 which will be early or late depending on the QNH (unless of course it is 1013)
Not true, below the transition alt. entered in the perf. page the FMGS will reference altitude regardless of what is set in the baro ref. window. You can set STD whenever you like, as long as SRS is still engaged (ie. you haven't pulled open climb) the aircraft will accelerate at the correct time.
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Old 18th May 2019, 20:32
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Set standard when passing transition altitude
Or you could follow whatever the company SOP says, which in every airline I've worked for has been to set STD as soon as cleared to a FL.
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Old 18th May 2019, 21:30
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Originally Posted by akindofmagic View Post
Or you could follow whatever the company SOP says, which in every airline I've worked for has been to set STD as soon as cleared to a FL.
Of course, it goes without saying.
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Old 18th May 2019, 21:42
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I am assuming the reason why this question is asked is because of the relation Setting STD has to the FMA's on the PFD. To state the obvious when flying NAPD you remain in MAN FLX SRS until you have climbed through the NAPD1 altitude you have selected in the Perf page of the FMGC.

There will be some cases with a low QNH that if you were to Set STD whilst still in the NAPD 1 phase, thus climbing via SRS, that setting Standard would cause the aircraft to go from an altitude of 2,700 to FL30 straight away, which is only a QNH change of roughly 10 hPA.

If you selected 3,000 as your ACC altitude in the Perf Page to comply with NAPD 1 then by setting STD, in this case, you will have trigged the aircraft to enter CLIMB mode earlier slightly early, and thus not completing NAPD1, beginning the reduction in nose attitude and the increase in speed.
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