\ LIGHTENING- HOLES PLAN SHOWING RIB IN .STEEL FORMER JOINT„ f N r ex .STEEL BAR FORMER 24 Gauge sheet steel Rig .SECTION A 3 … PLAN INNER STEEL FORMER Fig. 24. flange all round has been turned up. Thisfemale former is for the purpose of pre-venting the steel rib from buckling whenthe last operation of flanging is being car-ried out. 144 HOW AN AEROPLANE IS BUILT A COMPOSITE FORMER. As the first steel former could not be…
Airplanes
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