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PMDG problems

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EHM-0948 Bruno:
Ok Murray, thanks!

I am going to test it this evening ...

EHM-0948 Bruno:
Hi,

After testing it, it started descent but it didnt changed from "CRZ" to "DES" mode.... I don't know if it had to be this way, but I thought so...
Also he descent to 10000ft. It was correct because it was the value that I inputed on the AutoPilot.

Also, I don't know how can I tell him to only descend when he is at a distance that can descend at 1800ft/sec ... That means that he should start descend from 100 nm from the destination. Normally he starts descend much more far away ....

EHM-1570 Bruce:
Hi Bruno

If you want to descend at a later point, then do not change your altitude setting on the autopilot, otherwise the aircraft will start it's descent at the TOD, allow the aircraft to fly to the distance from the airport that you want to start the descent allowing the aircraft to fly at your present altitude, then change the altitude setting, if the descent does not start, go to the DES page, press the ARR key, then press DES NOW and the descent will start, it may happen that you will get the Descent Path not Available in which case you will have to set the descent rate manually.

EHM-0948 Bruno:
Ok Bruce, will try again.

EHM-0654 Murray:

--- Quote ---Originally posted by bfalcao
Also, I don't know how can I tell him to only descend when he is at a distance that can descend at 1800ft/sec ... That means that he should start descend from 100 nm from the destination. Normally he starts descend much more far away ....
--- End quote ---


Bruno,

Ordinarily, the FMC operates PATH DES (will follow LNAV at the expense of speed) hence it starting it's descent much further out.  If you want a higher rate descent you can switch it into SPD DES (it tries to maintain MCP SPD at the expense of maintaining the vertical profile), or use the MCP alone to fly the descent (using V/S and LVL CHANGE) - or even fly the DES phase manually ;D

NOTE: I could be wrong on this of course. I only have my FMC user guide with me at work, and it's DES section is very long and rather confusing...

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