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