sndp
Posts: 534
Joined: Fri Feb 18, 2000 6:07 pm

Thrust Reverser Handlers

Tue Jun 27, 2000 4:40 am

On a Boeing 737 I saw the thrust reverser being deployed by the pilot by taking two sort of throttles linked to the main throttles. I cannot see these two smaller throttles as I call them on a A320 for example. how are the thrust reversers deployed here, with the main throttles. And why doesn't the 737 has this sort of system?
thanx
sndp
 
ben88
Posts: 1037
Joined: Fri Dec 31, 1999 4:49 pm

RE: Thrust Reverser Handlers

Tue Jun 27, 2000 5:38 am

Yes, the reverse levers are connected to the main thrust levers. When the main thrust levers are in the idle position, the reverse levers are pulled upwards to activate reverse thrust, then pushed back down to de-activate. Hope that helps,
Ben


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Photo © Chris Coduto



This photo is of a 757 but the principle is the same. Do you see the two smaller white knobs directly behind the main thrust levers. Those are pulled up and towards you to engage reverse thrust.
 
ben88
Posts: 1037
Joined: Fri Dec 31, 1999 4:49 pm

RE: Thrust Reverser Handlers

Tue Jun 27, 2000 5:48 am

I just re-read your question and realized that my first post didn't answer it. The Airbus planes have this same system. I have photos of an A300 and an A340 throttle quadrant. Unfortunately I do not have a scanner. Next time you are in one of these cockpits, look a bit more carefully. If you are in a NG Airbus (A320, 330/340) the throttles are much smaller than on the Boeing models, but the reversers are there, and are used in the same fashion as on their Boeing brothers. Hope this helps,
Ben
 
VC-10
Posts: 3546
Joined: Tue Oct 26, 1999 11:34 am

RE: Thrust Reverser Handlers

Tue Jun 27, 2000 5:51 am

Firstly this post should be on the Tech/Ops board.

The Rev Thrust levers act on the same cable drum as the Fwd thrust levers and merely rotate drum in the opposite direction which will in turn, via the cable system, actuate the thrust lever input arm on the Fuel Control Unit in the opposite direction to fwd thrust. Within the FCU the arm is connected to a cam which through a cam follower and series of levers will increase the fuel flow. At idle the the cam follower is in the dwell of the cam. To increase fuel flow for either fwd of rev thrust the cam follower must come out of the dwell.

On a FBW a/c the levers (Fwd & Rev)just operates a transducer that signals lever position to the ECU.

The 320 also has a couple of reverse thrust levers but on this a/c the thrust levers proper will also move back to increase the thrust.

I hope this is clear.