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MarkW

Flying the 747 - question

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I have a question about the climb out shown in the video below.  Why would they set a climb out speed of 192 knots / flaps 10 speed and hold it to what looks like close to 3000 ft ?  I would have thought after 1000 or 1500 ft (not sure if they are flying NADP departure) they would lower the nose a bit and get the speed above flap retraction.

 

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I have a question about the climb out shown in the video below.  Why would they set a climb out speed of 192 knots / flaps 10 speed and hold it to what looks like close to 3000 ft ?  I would have thought after 1000 or 1500 ft (not sure if they are flying NADP departure) they would lower the nose a bit and get the speed above flap retraction.

 

 

Hi Mark,

 

I'm sure I'll be corrected if wrong but this seems to be a NADP 1 departure, where the aircraft is flown at V2 + 10-20 kts until 1,500ft AAL. The thrust is then reduced to climb thrust, which will require a small pitch nose down, but the configuration (Flaps, Current Speed) stays the same until 3,000ft AAL. At 3,000ft AAL, speed is then increased (VNAV automatically does this), a further pitch nose down and the aircraft is then cleaned up on schedule. When the aircraft is fully clean, the aircraft will pitch nose up to maintain the selected speed. This will normally be 250kts/10000ft.

 

Hope that helps. I thought usually that it's CLB thrust and clean up at 1,000ft AAL, but in this video it's different. Each airfield has it's own set of procedures either NADP 1 or NADP 2. NADP 2 is the most common I believe.

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Thanks Tristan, makes sense, I forgot about the second part of the NADP 1 with climb above 1500 at climb thrust.

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