Anyone thought of flying the -300 on the FuelFlow gauges. Much easier!
For level flight FF = (IAS/100) / 2
So, IAS is 280, FF = (280/100) / 2 = 1.4
If you the want to climb/descent at a 1000fpm, add/subtract 0.5
So to climb 1000fpm at 280 kts = 1.4 + 0.5 = 1.9
Works particulary well at lower levels.