PMDG747, Do you know? (Case Study)

FMS/Autoflight Tutorial : CASE STUDY 1 (Watch Airtimbuktu's Respond for the Airbus)

What happens when an aircraft encounters a flight plan discontinuity when LNAV is engaged?

PASPU 1A arrival ILS RW02L a discontinuity after SANAT.

FMA : SPD | LNAV | ALT

What happens in PMDG747, they didn't really programmed what's in the real world.

It is suppose that, LNAV should stay engaged on the FMA and it stays on current heading. "NOT ON INTERCEPT HDG" should appear on the CDU scratchpad.

Of course, this is done for a better understanding of the FMS and the heading configuration. And of course, the cropduster has some surprise for us!

Special thanks to Mr Cropduster from Timbuktu.

Category:

Autos & Vehicles

Tags:

• Boeing
• 747
• PMDG
• PSS
• FS2004
• FSX

[Mecurial95]

Geez, if I only know the LNAV RNAV thingy whatever, I'll be happy, thing is I don't know, Don't mind if you teach me sensei ;p

Heheh, and happy belated birthday

[slionboy]

Thanks,

Well in the MCP, LNAV basically means the Longitudinal Navigation, which means that in AP mode, it would auto track the lateral direction and helps to navigate the plane.

While the RNAV is an Area Navigation, which allows a pilot to fly a selected course to a predetermined point without the need to overfly ground-based navigation stations.(Eg, u are flying a sequence from point A-B-C. but now you don't feel like to fly to point B. So you adjust your course to fly directly to C)

[slionboy]

I'm not very sure or very good at explaining the RNAV. You can ask Airtumbuktu for help! And let me know the fully explanation of RNAV.

[jimfwh]

Yup, the same thing happens on the PSS777 as well. Nice job :)

[slionboy]

Thanks, Yup anyway youe PSS777 dummy helped me a lot. As I've got a PSS lately and learning the philosophy of it now..

[bravonismo]

But what's the purpose of putting a route discontinuity? I always fill the gaps (i.e. eliminate discontinuity).

[slionboy]

Oh well.. this is a sort of do you know what will happen in a real life scenario if discontinuity happens.

I'm trying to use my PMDG to do a real life scenario and to my surprise they didn't programmed it.

[Mecurial95]

Okay I got the feeling of it now.

Haha thanks slionboy :D

[Cessna162]

WHAT is ur graphics?!!

[jimfwh]

A real FMC is probably programmed with several million lines of code, something impossible for addon developers to do unfortunately, so we'll have to live with the limitations :)

[R1door]

Hmmm...So both PSS and PMDG are wrong! Fascinating!