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-   -   A320 SRS engagement (https://www.pprune.org/tech-log/649278-a320-srs-engagement.html)

vilas 10th Oct 2022 04:28

A320 SRS engagement
 
Hi guysI noticed a change in FCOM about engagement of SRS mode in go around(similar change for takeoff). Quoted below:
SRS GA engages when all of the following conditions are applicable:
  • The flight crew sets at least one thrust lever to the TOGA detent
  • The slats or the flaps are extended
  • The aircraft is airborne, or on ground for less than 30 s.
​​​Previously it required only the flap lever positioned atleast at 1 and not the surface itself. Does any one of your FCOM have the same? It's mistake in my opinion.

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PGA 10th Oct 2022 08:51

The A380 FCOM states the following:

”The slats/flaps configuration (based on the real position or flaps lever position) is different from the clean configuration”

vilas 10th Oct 2022 12:42


Originally Posted by PGA (Post 11310885)
The A380 FCOM states the following:

”The slats/flaps configuration (based on the real position or flaps lever position) is different from the clean configuration”

I should have mentioned I was talking about A320 FCOM. A380/A350 VFE comes from actual surface position and not from lever position like A320. But my question is for engagement of GA mode.

8314 10th Oct 2022 15:29

Same here.
Only in FCTM normal procedures GA phase activation can I find:

If the thrust levers are set to the TOGA detent with the flaps LEVER at 0, the following will occur:

AP/FD remain in appr/ ldg phase
etc…


deten the thrust levers are set to the TOGA detent with the FLAPS lever at 0, the following occur:t with the FLAPS lever at 0, the following occur:

vilas 10th Oct 2022 15:42


Originally Posted by 8314 (Post 11311111)
Same here.
Only in FCTM normal procedures GA phase activation can I find:

If the thrust levers are set to the TOGA detent with the flaps LEVER at 0, the following will occur:

AP/FD remain in appr/ ldg phase
etc…

r:

You will find in FCOM in autoflight approach landing, go around.

8314 10th Oct 2022 15:55

I know, our FCOM says the same as your initial statement: no mention of the lever!

sonicbum 10th Oct 2022 16:40


Originally Posted by vilas (Post 11310784)
Hi guysI noticed a change in FCOM about engagement of SRS mode in go around(similar change for takeoff). Quoted below:
SRS GA engages when all of the following conditions are applicable:
  • The flight crew sets at least one thrust lever to the TOGA detent
  • The slats or the flaps are extended
  • The aircraft is airborne, or on ground for less than 30 s.
​​​Previously it required only the flap lever positioned atleast at 1 and not the surface itself. Does any one of your FCOM have the same? It's mistake in my opinion.

​​​​​​

​​​​​​

Hi Vilas, same here. FCOM MAY 22.

iggy 10th Oct 2022 17:31

So, if SRS does not engage with the lever at Flap 1 position if the actual surface is not deployed, have they also changed the procedure in case of flapless landing (select Flap 1 so in case of GA the SRS will engage)?

vilas 10th Oct 2022 18:02


Originally Posted by iggy (Post 11311174)
So, if SRS does not engage with the lever at Flap 1 position if the actual surface is not deployed, have they also changed the procedure in case of flapless landing (select Flap 1 so in case of GA the SRS will engage)?

That's the problem. Nothing else has changed. Even FCTM talks about lever not the surface.

tubby linton 10th Oct 2022 18:10

Has somebody in Toulouse thought that we don’t want a crew getting airborne if the slats flaps have not extended correctly which is why this change implies surface rather than lever position?

Sergei.a320 11th Oct 2022 18:33


Originally Posted by vilas (Post 11310784)
Hi guysI noticed a change in FCOM about engagement of SRS mode in go around(similar change for takeoff). Quoted below:
SRS GA engages when all of the following conditions are applicable:
  • The flight crew sets at least one thrust lever to the TOGA detent
  • The slats or the flaps are extended
  • The aircraft is airborne, or on ground for less than 30 s.
​​​Previously it required only the flap lever positioned atleast at 1 and not the surface itself. Does any one of your FCOM have the same? It's mistake in my opinion.

​​​​​​

​​​​​​

Hello, you may check GSOH of this chapter and find was it wording enhancement or pin programming result😉

vilas 12th Oct 2022 05:06

The problem is FCTM doesn't say flaps/slat but only lever out of zero. So it needs amendment. And if it's really modified then slat/flap jammed at zero procedure needs change.

AerocatS2A 23rd Oct 2022 02:17

My FCOM (09-SEP-22) says:


Setting at least one thrust lever to the TOGA detent engages both SRS/NAV modes, if:
- The flaps lever is at least in position 1, and
- The aircraft is in flight, or
- The aircraft has been on ground for less than 30 s (AP disengages and can be re-engaged 5 s after lift-off).

AerocatS2A 26th Oct 2022 10:43

I take that back. We were a bit behind but our latest FCOM has flaps/slats position rather than lever position.

vilas 7th Nov 2022 08:38


Originally Posted by AerocatS2A (Post 11320261)
I take that back. We were a bit behind but our latest FCOM has flaps/slats position rather than lever position.

It's was a mistake as I thought. You should be getting a correction reverting to older statement.

AerocatS2A 9th Nov 2022 19:38


Originally Posted by vilas (Post 11326660)
It's was a mistake as I thought. You should be getting a correction reverting to older statement.

I imagine we will get it in the next year or two.


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