IS IT 'THRUST 'OR 'POWER' ON A BIG JET.

Date:         28 Jun 98 18:47:38 
From:         Iain Stuart <big-iain@big-iain.demon.co.uk>
Organization: Don't be silly.
References:   1
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Using a combination of fingers and keyboard, <airliners.1998.984@ohare.Chi
cago.COM>, Donald Mc Lean <cowboy@ram.net.au> typed
>In answering a question on use of reverse thrust , asymmetric use of
>reversers Mandy Bartels said that the 'power' on the b747-400 is reduced to
>'idle' and the reversers are operated in that position to minimise the
>opposition to brakes or words to that effect.
>Surely the 'thrust' is reduced to 'zero' with the reversers at the interlock
>position, ie , so no forward or reverse thrust is produced.

Nope. The thrust reversers are operated at engine idle to minimise the shock
loading on the engine/aircraft. The engine can then be accelerated, in Rev
Thrust.  Not to full power, but to a fair power.  This provides a thrust, but in
the opposite direction to usual, decellerating the aircraft on landing (or
reversing the aircraft from a gate, if you can't be bothered waiting for a tug.)

The LaudaAir 767 crash shows what can happen if a reverser operates in
flight at high power.

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Iain