Intercepting the ILS
Join Date: Jun 2005
Location: London
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Correct. You basically want to try and deploy the next set of flaps as close as possible to the Vref for your current flap setting. My company's SOPs, for example, calls for speed being within 10 kts of Vref before deploying next flaps. If you just used the max placard speeds, you could be well outside those 10 kts. Flaps 5 placard speed on the NG is 250 kts, with a Vref of around 150 kts (changes with weight). So you could be 100 kts away from Vref without exceeding design limits! But like I said, it wouldn't do much good to your flap maintenance costs :-)
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