domi.ga
Posts: 34
Joined: Mon Aug 13, 2001 4:57 pm

Red Switches On The Thrust Levers

Tue Jul 08, 2003 4:56 am

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

 
Squigee
Posts: 634
Joined: Sun May 20, 2001 3:21 pm

RE: Red Switches On The Thrust Levers

Tue Jul 08, 2003 5:14 am


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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.
 
domi.ga
Posts: 34
Joined: Mon Aug 13, 2001 4:57 pm

RE: Red Switches On The Thrust Levers

Tue Jul 08, 2003 5:34 am

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
 
Rick767
Posts: 2613
Joined: Sun Jan 30, 2000 8:11 pm

RE: Red Switches On The Thrust Levers

Tue Jul 08, 2003 5:52 am

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...
 
mb339
Posts: 235
Joined: Fri Jun 01, 2001 8:37 pm

RE: Red Switches On The Thrust Levers

Tue Jul 08, 2003 6:07 am

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
 
Rick767
Posts: 2613
Joined: Sun Jan 30, 2000 8:11 pm

RE: Red Switches On The Thrust Levers

Tue Jul 08, 2003 6:28 am

"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...
 
cancidas
Posts: 3985
Joined: Thu Jul 03, 2003 7:34 am

RE: Red Switches On The Thrust Levers

Tue Jul 08, 2003 9:18 am

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."
 
domi.ga
Posts: 34
Joined: Mon Aug 13, 2001 4:57 pm

RE: Red Switches On The Thrust Levers

Tue Jul 08, 2003 9:14 pm

Hi,

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

Bye
 
ba299
Posts: 182
Joined: Wed Jun 04, 2003 9:18 pm

RE: Red Switches On The Thrust Levers

Wed Jul 09, 2003 6:13 pm

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.
 
A320-Tech
Posts: 38
Joined: Sun Jan 27, 2002 11:49 am

RE: Red Switches On The Thrust Levers

Tue Jul 15, 2003 4:34 pm

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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