|Quoting Fr8mech (Reply 1):|
More than likely, the #1 reverser in inoperative and on MEL. There is a chance that the #4 may be inoperative and the crew decided to use only the inboards to avoid assymetrical reverse.
|Quoting FBU 4EVER! (Reply 4):|
There is an interlock mechanism between no. 1 and no. 4 thrustlevers to ensure that both outer engines are at idle reverse thrust before reverse thrust can be increased, thus avoiding thrust assymetry.
|Quoting TPA36R (Reply 5):
Could it be for the same reason the A380 only uses 2 and 3 TR's? FOD?
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