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Forum: Tech Log

25th May 2019, 11:08

Replies: 117

Using GPS ground speed to resolve Unreliable Airspeed

Views: 45,987

Posted By FlyingStone

Sure it will be decresing. But the aircraft will...

Sure it will be decresing. But the aircraft will start descending at a safe speed/AoA to keep the wing flying. As you are at FL370, no problem with terrain clearance, and the ATC will get the other...

Forum: Tech Log

25th May 2019, 10:11

Replies: 117

Using GPS ground speed to resolve Unreliable Airspeed

Views: 45,987

Posted By FlyingStone

A 737 will go to Vmo at 10deg pitch and 80% N1...

A 737 will go to Vmo at 10deg pitch and 80% N1 with flaps extended? Or 4 deg pitch and 75% N1 in clean configuration? Even at OEW and a bit of fuel to run the engines, I very much doubt it.

Why do...

Forum: Tech Log

25th May 2019, 06:21

Replies: 117

Using GPS ground speed to resolve Unreliable Airspeed

Views: 45,987

Posted By FlyingStone

And yet, it's safe, which is what matters in the...

And yet, it's safe, which is what matters in the end, not how accurately you can fly the speed you can't even see or whether you will climb or descent.

This is Boeing's take on this:

If...

Forum: Tech Log

24th May 2019, 22:58

Replies: 117

Using GPS ground speed to resolve Unreliable Airspeed

Views: 45,987

Posted By FlyingStone

Personally, I'd stick with the approved...

Personally, I'd stick with the approved procedures for unreliable airspeed.

Your GS is 500kts. Are you safe? Could be TAS of either 650 or 350 with a 150kt wind. Neither of which will keep you...

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