A320 ENG 1(2) CTL VALVE FAULT

[CMpilot1]

On a NEO 320, the above ECAM would call for THR LEVER 1(2).........IDLE; A/THR......OFF. Now let's assume ENG 1 is affected. We would have reduced the THR LEVER of ENG 1 to idle per ECAM. Now regarding "A/THR....OFF" part of ECAM; What does this mean? Do we have to disconnect the A/THR on ENG 2? Why would we have to do that when ENG 2 is not affected by the above fault?

[Fursty Ferret]

Because if you don't turn off the autothrust you'll get a chime every few seconds telling you that the autothrust is limited, and to put the the thrust lever back where you found it...

[OPEN DES]

CFM LEAP
No.
It is to avoid rapid thrust changes as per ECAM, only manual thrust can guarantee to do that.

[pineteam]

I checked the FCOM and they do mention the requirement to avoid rapid thrust changes. But why is that a requirement on the good engine? Is this failure possible due to fuel contamination?

[CMpilot1]

OPEN DES,
The effected engine's thrust lever will already be in idle. So there is no question of rapid thrust change for this engine. That means "to avoid rapid thrust change" information is meant for the non-affected engine. But why should you avoid rapid thrust change on the engine which is not effected?

[OPEN DES]

It is a case of the ECAM system display logic not being apparent by just looking at the FCOM.

The display of the various action lines depend on the actual Failure Case leading to the triggering of the ECAM:

When SB/BAI valve failed:
AVOID ICING CONDITIONS
THR LEVER n ………… IDLE

OR
When TBV valve failed:
A/THR ……………. OFF
AVOID RAPID THR CHANGES

Hope this helps.

[CMpilot1]

OPEN DES,

That kind of makes sense. Could you let me know where to locate the information about the connection between the above mentioned valves and the associated ECAMs it generates. The FCOM doesn't specify. Thanks

[OPEN DES]

Hi CM1,

Unfortunately no written reference that I can share with you. If you are a tech pilot you may have access to Airbus World where in the A320 ESLD (ECAM System Logic Data) document you will find half of the reference you need. It merely describes that display of the different action lines are a function of different failure cases, without specifying which one is associated to what failure case.
Hope it helps.

[CMpilot1]

I don't have access to AIRBUS WORLD. Thanks for the info.

[320busboy]

OPEN DES

Have a look again.
Airbus kindly pulled the ESLD/B from airbus world. Much to the frustration of anyone trying to fix them.