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Red Switches On The Thrust Levers  
User currently offlineDomi.ga From Germany, joined Aug 2001, 34 posts, RR: 0
Posted (11 years 5 months 2 weeks 2 days 23 hours ago) and read 2861 times:

Hello,

I've just watched an aviation video, which deals about the A320. One scene shows the thrust levers from behind and a small red switch can be seen on the lower back of the left lever. I think normally it is covered by a black cap and it seems, that there are two of these switches (one on each lever).

Can anyone tell me, what theses switches are for?

Thanks

Dominic



9 replies: All unread, jump to last
 
User currently offlineSquigee From Canada, joined May 2001, 652 posts, RR: 4
Reply 1, posted (11 years 5 months 2 weeks 2 days 23 hours ago) and read 2820 times:


View Large View Medium
Click here for bigger photo!

Photo © Ander Aguirre



"The red buttons at the left and right of levers 1 and 4 are used for instinctive disengagement of the autothrust system."



Someday, we'll look back at this, laugh nervously, and then change the subject.
User currently offlineDomi.ga From Germany, joined Aug 2001, 34 posts, RR: 0
Reply 2, posted (11 years 5 months 2 weeks 2 days 23 hours ago) and read 2805 times:

Hi,

thank you very much for your answer. But that is not what I mean. On the picture I do not see that switches (or their covers). It seems, that the switches are not present in a A340.


View Large View Medium
Click here for bigger photo!

Photo © Adrian Raths



On this pic you can hardly see the two black (rectangle) covers (at about the center of the levers). If the cover is flipped, the red button appears.

Any ideas?

Dominic


User currently offlineRick767 From United Kingdom, joined Jan 2000, 2662 posts, RR: 51
Reply 3, posted (11 years 5 months 2 weeks 2 days 23 hours ago) and read 2796 times:

The switches select "BUMP" thrust, a 10% (?) thrust increase on TOGA. Helps the aircraft get out of shorter runways by increasing the PLTOW (Performance Limited Takeoff Weight). Maintenance log entry required each time it is used and a certain number of uses requires an engine overhaul / inspection I believe.

I'm not sure all versions of the A320 have the feature, Airbus drivers will correct any of the above which is not accurate I'm sure!



I used to love the smell of Jet-A in the morning...
User currently offlineMb339 From Italy, joined Jun 2001, 238 posts, RR: 3
Reply 4, posted (11 years 5 months 2 weeks 2 days 22 hours ago) and read 2783 times:

This feature belongs only to Airbus equipped with V2500 engine. Never seen on CFM56 engines.

Domi.ga.I assume you saw this red switch in A320 intelligent Video.

Bye


User currently offlineRick767 From United Kingdom, joined Jan 2000, 2662 posts, RR: 51
Reply 5, posted (11 years 5 months 2 weeks 2 days 22 hours ago) and read 2774 times:

"This feature belongs only to Airbus equipped with V2500 engine. Never seen on CFM56 engines"

Yes I was going to say that, as Air 2000 A320s (CFM) do not have BUMP thrust (used to jumpseat them all the time as a teenager), but I thought it may be a carrier option...



I used to love the smell of Jet-A in the morning...
User currently offlineCancidas From Poland, joined Jul 2003, 4112 posts, RR: 11
Reply 6, posted (11 years 5 months 2 weeks 2 days 19 hours ago) and read 2720 times:

Usually on Boeing aircraft they are for fuel cutoff. I don't know about Airbus A/C.


"...cannot the kingdom of salvation take me home."
User currently offlineDomi.ga From Germany, joined Aug 2001, 34 posts, RR: 0
Reply 7, posted (11 years 5 months 2 weeks 2 days 7 hours ago) and read 2634 times:

Hi,

MB339: you are right: it was the ITTV video about the Inter European A320.

Bye


User currently offlineBa299 From United Kingdom, joined Jun 2003, 173 posts, RR: 1
Reply 8, posted (11 years 5 months 2 weeks 1 day 10 hours ago) and read 2513 times:

In my days with airtour we needed e special authorization from the maintenance to use the increased thrust. It increase the TO/GA thrust of 10%, very useful during the summer in some Greek islands.

User currently offlineA320-Tech From United States of America, joined Jan 2002, 38 posts, RR: 2
Reply 9, posted (11 years 5 months 1 week 2 days 12 hours ago) and read 2409 times:

Rick is correct. These are found on older A320s which have the original V2500-A1 engines installed (HP) and they are used for that purpose, to give a 'power boost' on take off from hot/high runways.
They are not equiped on the -A5 engines as the thrust rating is higher.

Regards,

A320-Tech


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