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PMDG 737 APU help .. (Read 4248 times)
Feb 28th, 2009 at 12:46pm

slamshedida   Offline
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i have FS9.1 , and i can't get the apu to start.
i followed some tutorials , but they didnt work. i dont know why !

i load a cessna and close the mixture and magnetos and then load the PMDG from cold and dark.

i first switch the battery , then the stand by power , ground power and then when i press the APU generator , bothing happens ......

what am i doing wrong ??

thnx
 
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Reply #1 - Feb 28th, 2009 at 8:42pm

expat   Offline
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Firstly, I do not have the aircraft that you are asking for help with, however I do work on 737's and PMDG are know for getting it right in their simulatations, so the sequence that I use is as follows.

Battery on
Ground power on (leave standby power as it is)
Left wing fuel pump, either one it does not matter.
APU squib check
Fire detection test
APU start switch to on.
Wait until low oil press illuminates and no blue maint light comes on.
Move APU start switch from on to start.
APU will start.
Once running and the GCU has checked the voltage, you will get the two APU bus lights turning blue. Two lights is a hold over from the 737 Classic when it had two buses. The NG has only one bus. Either of the switches will then power the APU bus. The second switch just turns the remaining light off (left over from Classic so pilots could jump form Classic to NG without new rating)
Once you have done this, you can select your bleed etc.

I would imagine that the PMDG will follow some of this in the sim.

Matt
 
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Reply #2 - Feb 28th, 2009 at 9:04pm

JBaymore   Offline
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expat wrote on Feb 28th, 2009 at 8:42pm:
Firstly, I do not have the aircraft that you are asking for help with, however I do work on 737's and PMDG are know for getting it right in their simulatations, so the sequence that I use is as follows.

Battery on
Ground power on (leave standby power as it is)
Left wing fuel pump, either one it does not matter.
APU squib check
Fire detection test
APU start switch to on.
Wait until low oil press illuminates and no blue maint light comes on.
Move APU start switch from on to start.
APU will start.
Once running and the GCU has checked the voltage, you will get the two APU bus lights turning blue. Two lights is a hold over from the 737 Classic when it had two buses. The NG has only one bus. Either of the switches will then power the APU bus. The second switch just turns the remaining light off (left over from Classic so pilots could jump form Classic to NG without new rating)
Once you have done this, you can select your bleed etc.

I would imagine that the PMDG will follow some of this in the sim.

Matt


Nothing like having some REAL aircraft expertise for answering questions!   Smiley

best,

...................john
 
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Reply #3 - Mar 1st, 2009 at 5:15am

slamshedida   Offline
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thnx for replying ,

but i think i dont have ground power in the airport ( after i switch the battery on) , the ground power light is OFF ( i think the airport doesnt have a ground power )

does any1 know which airports that have ground power ?

thnx alot
 
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Reply #4 - Mar 1st, 2009 at 7:00am

The-Black-Sheep   Offline
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Look below the ground power light, you'll see a little switch with the letters "GRD PWR OFF/ON" written above/below it. Hopefully that should work for you.

As expat said, turn on left fuel pump. If using APU for a long time, you can turn on left centre pump aswell...but I do believe PMDG 737 doesn't model APU fuel usage, not sure on that though

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Reply #5 - Mar 1st, 2009 at 7:06am

slamshedida   Offline
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yes but i already pressed that button,
what i mean is the light above taht switch which says " ground power available "  is OFF ( the light is off) , so i think there is  no ground power in the airport already to use.

so im looking for airports which have ground power available ..


i duno what to do ??

P.S : what is "APU squib check " ??
 
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Reply #6 - Mar 1st, 2009 at 7:16am

expat   Offline
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You should be able to start the APU on the battery without ground power, well you can in the real world. Are you following this for a start up, if so it should be fine. One thing though, in the real world the standby power is always in the "Auto" position, it is never turned off as in this example.

Matt
 
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Reply #7 - Mar 1st, 2009 at 7:27am

slamshedida   Offline
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yes im following that tutorial , but if u notice in the third pic. in that tutorial , the ground power light is illuminated , but when i play   the ground power light is not illuminated even if i switch the battery and standby power and the switch of the ground power to ON ...
u get what i mean  ??

thnx
 
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Reply #8 - Mar 1st, 2009 at 8:29am

RIC_BARKER   Offline
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If you go to the menu bar and look under PMDG options, you will see an option for "ground power available". Check that's on, and you should see that light illuminate.

Ric B.
 
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Reply #9 - Mar 2nd, 2009 at 2:01am

slamshedida   Offline
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@ ric_barker :

i didnt find any options regarding the Ground power.

i think i have a fault in the APU , i iwll try to send a screenshot asap.

but so far , any1 knows how to deal with APU fault ?
Thnx alot
 
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Reply #10 - Mar 2nd, 2009 at 4:54am

expat   Offline
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slamshedida wrote on Mar 2nd, 2009 at 2:01am:
@ ric_barker :

i didnt find any options regarding the Ground power.

i think i have a fault in the APU , i iwll try to send a screenshot asap.

but so far , any1 knows how to deal with APU fault ?
Thnx alot


Depends what it is, but it could vary from replacing the load control valve, delta "P" sensor, the generator to the APU itself for example...........sorry we are talking about a sim Grin Grin

Matt
 
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Reply #11 - Mar 4th, 2009 at 2:22am

slamshedida   Offline
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http://img3.imageshack.us/img3/7325/alanb.jpg

hey thisis the screnshotfrom the overhead panel .

i think there is something wrong with the battery.
notice inthe screenshot that is turned on . plz look @ the yellow circle.

besides, the APU gen ( the blue lights are not illuminated )  @ red circles.

and if u look UP, the DC volts or Amperes reads ZERO.

can any1 hlp me plzwith the battery thing ??

thnks alott.
 
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Reply #12 - Mar 4th, 2009 at 6:57am

expat   Offline
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slamshedida wrote on Mar 4th, 2009 at 2:22am:
http://img3.imageshack.us/img3/7325/alanb.jpg

hey thisis the screnshotfrom the overhead panel .

i think there is something wrong with the battery.
notice inthe screenshot that is turned on . plz look @ the yellow circle.

besides, the APU gen ( the blue lights are not illuminated )  @ red circles.

and if u look UP, the DC volts or Amperes reads ZERO.

can any1 hlp me plzwith the battery thing ??

thnks alott.



OK, for starters the yellow circle is temperature of the fuel in the tanks.
The DC volts indicate zero because you have the selector on Standby Power. The standby power switch that should be on is the one below; "Batt/OFF/AUTO. It should be on auto always. Those two rotary switches are not power selector switches. They only show the volts and amperage of the buses. Want know the voltage on particular system, you select it on these rotaries. That is ALL they do.
The two red circles are the ENGINE generator selector switches. The APU are the two inner of the four. Also blue indicates OFF not on. Boeing work on the dark cockpit philosophy, if it is ON, then the lights are OFF.....less for the pilot to have to look at.

Looking at the screen shot, EVERYTHING looks as it should. Do the following:

Rotate the LEFT hand rotary to BAT BUS
Rotate the RIGHT hand rotary to GRD PWR
In the shot, ground power is OFF (the lamp is Blue). Turn it on. Lamp goes out.
You should now have volt and amps displayed for those buses.


Select APU to start, once it has started and it takes up to about 40 seconds, turn the APU generator switches ON (lamps go out) You can now turn the rotary to APU and see the volts and amps for that Bus too.

Let me know how this goes and then we can carry on if required.

Matt

PS, if you have by chance saved this flight, you need to reload it. The aircraft battery is close to being flat, indicated by the TR light being on.
 
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Reply #13 - Mar 4th, 2009 at 7:04am

Jim Hodkinson   Offline
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Hi

I must admit that I have tried the set up you describe, and I can not reproduce your problem, but I was just thinking, have you got ANY failures enabled in the PMDG drop down menu, you may not have enabled them, but I does not follow that they are not enabled, FS can be funny that way.

As for not having ground power available, can you tell me which airport and stand you are using for your tests, and when you created your cold and dark panel state, did you turn off the Cessna battery and avionics as well as the mixture and mags before loading the 737.

So if you could make a new flight and give me a step by step guide to how you set up the flight, including the airport and stand, I could try it on my system and see if I get the same or similar results, and we MAY be able to sort out what the problem is.

Jim H
 
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Reply #14 - Mar 8th, 2009 at 6:40am

slamshedida   Offline
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solved the problem ..

the FSUIPC was cracked

when i insalled a agenuine version it worked.

Thanks
 
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