Mr Walsh went on: "The Gatwick proposals, which will result in a significant increase in charges, are completely unjustifiable, totally unacceptable and directly contravene the CAA's new remit to represent customers' interests.
"The CAA must not be allowed to fail again. In line with its new remit, (CAA chairman) Dame Deirdre Hutton and the CAA board should protect customers and ensure that they get a better deal.
"We will make strong representations to Dame Deirdre and the board to reconsider this proposal."
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More than 200 guns were handed in to police during a regional gun amnesty this month.