G.Franco

have a look at :

http://williams.best.vwh.net

Anyway an INS to follow a great circle leg calculates every 24sec the initial True Course.

The initial True Course is the Tan of the arc  from the plane position to the arrival waypoint in the plane position.

You can understand that the plane Hdg commanded by the INS is changing every 24sec.

During the navigation following the great circle the bearing always changes To have an idea during an atlantic crossing from Europe to America at 50°N of latitude from a waypoint to the next one

(10° of longitude) the plane HDG changes against the precalculated Hdg 4°more at leg starting is coincident at middle leg and is 4° smaller at the lag end.  

a me per fortuna qualche tempo fa si è rotto il mio vecchio monitor.Dico per fortuna perchè lo ho sostituito cno un monitor eccezionale.

HP ZR2440w IPS 25.5 pollici e risoluzione 1920x1200.Esiste anche il 27 pollici.

Gianfranco

voxatc è per FSX e non per FS2004.Io qualche anno fa ho usato radar contact con FS2002 e2004 ma sono tornado al programma di default che è

per me migliore.Qualche tempo fa c'era voxatc per FS2004 ma adesso è sparito e non saprei dove andare a trovarlo.Gianfranco

I was speeking about the B747 classic.I never flew on 747-400 because the F/E position has been canceled.

Patrick when started the topic forgot to state that he was speeking about B747-400.

Regards Gianfranco

demand pumps???Maybe you call demand pumps the ADPs.These air driven pumps automatically start when the HYD pressure drops below 2600psi?Electric motor driven pumps for systems2&3??? I flew 21 years as F/E of Alitalia B-747 and I can assure you that on board of B-747 there are 4 EDP(engine driven pumps) and 4 ADP(air driven pumps).There's also an auxiliary electric pump operative only on ground for ground necessities as provide HYD pressure to set parking brake or push back&towing the plane around the airport.

When you'll be able to build your B-747 you can make the electric motor driven pumps for the systems2&3.???

It's a pity but until now these pumps even do not exist on board of the B-747.

Regards  Gianfranco

All four system Pumps are  engine driven or pneumatic driven.You have to switch the pump1 to auto because until the engine 1 is shut the body gear steering is activate by the air provided from APU.It's possible only move the plane around the airport using the APU air&electric power and having the body gear steering and the brakes activated.

Gianfranco

Hi Patrick,

Before the push back&towing the Hyd pumps that have to be switched are two.

The ADP1 in AUTO position and the AC pump to ON position.

The ADP1 to pressurize the related Hyd system n°1 and to provide hyd pressure to the Body Gear steering.

The AC pump to provide the Hyd pressure to the brakes.

I remember you that the push back&towing can be performed with engines shut so to provide the necessary Hyd pressures the APU Air&electric power is needed.

Cheers Gianfranco

Bill,

that's the right code .I would like to know ,just for learning, the why of code after " and and ". Please explain to me.

Thanks

Gianfranco

Hi Jan,

your corrections to the code have been the right solution. Now the ALERT Light on my HSI works properly on ground and in flight.

Thank you very much indeed.

Gianfranco

I'm using a.XML editor and if spaces are needed it advices me.

Gianfranco

<Element>

<Position X="61" Y="272" />

<Select>

<Value>(A:GPS WP ETE, minutes) 2 <(A:GPS IS ACTIVE WAY POINT,bool)(A:ELECTRICAL AVIONICS BUS VOLTAGE, volts) 10 >and and</Value>

<Case Value="0">

<Image Name="wpt Alert1" ImageSizes="12,44" Bright="yes" />

</Case>

<Case Value="1">

<Image Name="wpt Alert2" ImageSizes="12,44" Bright="yes" />

</Case>

</Select>

</Element>

This is the code and the problem is on ground during taxi.When the plane is stopped the ALERT LIGHT comes on illuminated and when the plane moves the Alert light goes out.After TO the ALERT LIGHT works properly.Using the (A:SIM ON GROUND,bool) if etc... the light on ground is always off but when the plane leaves the ground the light suddenly illuminates and remains illuminated during the flight.Using as you said the variable (A:GPS DRIVES NAV1,bool)instead (A:GPS IS ACTIVE WAY POINT,bool) the light is always illuminated both on ground and flight.

This code drives me crazy.

Gianfranco

Hi Spokes,

Now I know exactly the flag behaviour on ground. During pushback, taxi alignment etc.. when the plane stops the flag comes on illuminated and comes out when the plane

moves again. When in flight the flag works great. Do you think there's a way to disable on ground the flag in order do not have this not real and elegant behaviour?

Thanks for your help.

Hi Jan,

the variable (A:GPS DRIVES NAV1,bool) doesn't work for this gauge. Thank you anyway.

Gianfranco

Hi Spokes,

you're great now the ALERT LIGHT works properly but only when the plane leaves the ground. After having loaded the flight plan the ALERT LIGHT illuminates and remains illuminated until the plane leaves the ground. When in flight the light works as it's expected to do. May be it's better to disable the ALERT LIGHT when the plane is on ground using the variable (A:SIM ON GROUND,bool)?

Ciao Gianfranco

Hi Spokes,

thank you for your help, but unfortunately it doesn't work. The light is illuminated for few seconds when the flight plan is loaded but during the flight the light remains always off.

The short illumination at Flight plan loading I think is a symptom that the right solution is near but it isn't yet available. Anyway thanks again for your help and if you 'll have a solution  you 're always welcome.

Gianfranco

As in the real B747 on the HSI there's a flag to alert the pilot two minutes before reaching the next waypoint.

<Element>

<Position X="61" Y="272" />

<Visible>(A : Electrical avionics bus voltage, bool)</Visible>

<Select>

  <Element>
      <Position X="61" Y="272" />

      <Visible>(A:ELECTRICAL AVIONICS BUS VOLTAGE,bool)</Visible>

      <Select>
         <Value>(A:GPS IS ACTIVE WAY POINT,bool) (A:GPS WP ETA,minutes) - abs d 2 >= r 60 <= &&</Value>

         <Case Value="0">
            <Image Name="wpt Alert1" ImageSizes="12,44" Bright="yes" />
         </Case>

         <Case Value="1">
            <Image Name="wpt Alert2" ImageSizes="12,44" Bright="yes" />
         </Case>
      </Select>
   </Element>

After many attempts I'm not able to have the "Wpt Alert2"illumination.It's expected to illuminate two minutes before the next waypoint.

All helps will be welcome.

Gianfranco

OK.I removed both lines entirely but the real problem remains.

Why it works only the last inserted Element. And why if I switch the order of the insertion in the file the new last works and the other one stops working? 

Changed Bool with Enum but the result is always the same. Anyway I'm using FS9.

HI,

In my B742 panel I put two guarded with three positions switches: the VHF-NAV failure switch and the INS failure switch. By those switches it's simulated the possibility in case of VHF-NAV1 or VHF-NAV2 failure 

to swap the inoperative VHF-NAV with the VHF-NAV3.The same for the INS1 and INS2.As in the real B742.

By the two switches a Flag on the Cpt HSI and FO HSI announces 1 or 2 or 3 to indicate which is the VHF-NAV or which is the INS  feeding the data to the related HSI.

Both Flags are working properly but it's very strange that they cannot work simultaneously. It's operative only the Element last inserted in the HSI file. 

The HSI file is too big and it's not possible to attach at this post.So I'm attaching of this file only the two related Flag Elements and the VHF-NAV Failure switch with value(L:NAV,bool). 

The INS Failure switch is quite the same but its value is (L:INS,bool).

Thanks for your help.

Gianfranco

Thanks Bill. I have seen the solution in a your previous post I find during a search. Thank you again.

Gianfranco

Hi Jan,
thanks for your help.I solved the problem and the solution has been so stupid that I'm looking to me as a stupid men.
I used your second code for rotation because the first one, surly because I'm not able to insert it in the HSI,it doesn't work to me.
With your second code everything works properly but  a little correction must be made:You have to add /-/ after the Token Variables.

 <Rotate>
<Value>
(L:href,bool)
if{ (A:PLANE HEADING DEGREES TRUE,degrees) /-/ }
els{ (A:PLANE HEADING DEGREES MAGNETIC,degrees) /-/ }
</Value>
</Rotate>

Thanks again for your help
Gianfranco

With your code The HSI compass is stuck indicating North instead of 146.To be sure of the code insertion in the HSI I'm asking if this code is the <Value> of the compass card <Element>.

if it is:

 <Element>

<Position  X="198 Y="232"/>

<Rotate>

<Value>%((L:href,bool)) %{if} %(360 (A:PLANE HEADING DEGREES TRUE,degrees) dnor near d 0 == ?)%!03d! %{else} %(360 (A:PLANE HEADING DEGREES MAGNETIC,degrees) dnor near d 0 == ?)%!03d! %{end}</Value>

</Rotate>

<Image Name="HSI_CARD.bmp" ImageSizes="236,236"  Bright="YES">

<Axis X="118",Y="118"/>

</Image>

</Element>

Thanks for the help:

Gianfranco

Hi to all,

flying a B742 and using the INS instead the GPS I need to convert the NAV-GPS Switch to NAV-INS.

As in the realty on the B742 the NAV-INS switch changes the HSI compass headings from magnetic to True. That's to follow the INS Great circle navigation.

I made several attempts by the variable tokens:(Plane heading degrees gyro, radians) and the(Plane heading degrees true, radians) but unfortunately with no result.

I've only the magnetic headings or true ones depending on the order that I put the tokens in the gauge.

Any help will be very appreciated.

Thanks Gianfranco

I think that switching the NAV-GPS switch to GPS position the flag on HSI must revert indicating that the GPS is now driving the NAV1 but also the compass card on HSI should indicate a True Heading. I looked at all default planes and I noticed that the compass card remains indicating a Magnetic heading. Which is the right indication?

Gianfranco

OK. the problem is now solved.