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12th Aug 2008, 20:11

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dublinpilot

Join Date: Feb 2002

Location: Dublin

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Well you want to desent to 1372ft QNH (1000QFE plus airfield elevation of 372ft)

So you want to desent 1628ft....(3000 down to 1372). You want to do this in the space of 12nm (15nm less 3nm as you want to be level by 3nm)

So 1628ft in 12nm.

So low long will it take you to travel 12nm? Well ground speed =110kts. So 12/110kts *60 mins in an hour=6.545 mins to travel 12nm.

So you want to desent 1628 feet in 6.545 mins. or 249 feet per minute.

I hope I haven't missed anything!

dp

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