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Descent with FMC.

Pro Member First Officer
Mohit (Mc_GaNgStA) First Officer

I can do most of the FMC operations on the PMDG 737-600 NG aircraft except the descent. Any help please?

Guest

Are you using VNAV?

Pro Member First Officer
Mohit (Mc_GaNgStA) First Officer

Please explain me how to use it on descent, and how to control the altitude descent. FMC goes too slow on descent and ATC keeps complaining, and also I don't reach runway on time.

Pro Member Captain
ARD-DC Captain

Mc_GaNgStA wrote:

Please explain me how to use it on descent, and how to control the altitude descent. FMC goes too slow on descent and ATC keeps complaining, and also I don't reach runway on time.

When the plane descends, what is the N1 setting that the A/T maintains, and what is the airspeed indicator doing?

If N1 is at idle, and the airspeed is not decreasing, then you are at your maximum descend rate; the plane can in that case not descend faster because it will exceed the set speed limit.
Unless, of course, you increase drag.

Pro Member First Officer
Mohit (Mc_GaNgStA) First Officer

Okay so I have to modify the N1 limits then? Can you briefly tell me what they should be for a proper descent?

Pro Member Captain
ARD-DC Captain

lol Laughing excuse me but you had me laughing there.
what you should do is enter your descend at a lower speed, not tweak you engines Very Happy

just try it out first, start a desced, and watch what n1% is being maitained.

if i am not mistaken, vnav descends should be at idle thrust.

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