PMDG737 won't start with PMsystems

[NicD]

I'm talking to PM support about this - but just wondered if any of you have struck the same problem....

I’ve been using PMsystems for a few months now without problems. Just in the past few days I cannot get an engine start with PMsystems. The N2 rises to 22%, fuel cutoff is brought to idle, but it will not start and the start valve just keeps cycling without success.

Everything is set properly – APU running, APU bleed on, packs off, valve open etc. However I’ve noticed that the duct pressure (in PMsystems) is very low .. only about 5-10%. The CFM56 needs 30% for a start as far as I know.

If I shutdown PMsystems I can then start successfully using an FS panel (on-screen). Note - the PMDG panel is competely disabled - so should be no conflicts there.

I’ve tried builds 94 and 98 with the same result. Also did an uninstall and reinstall of PM systems with no change.

[Trevor Hale]

Sounds like you should talk to Maintenance regarding the issue. Maybe it is time for the aircraft to have it's annual

LOL

[ekezz]

Have seen this once a long long time ago.
Do you start ENG2 or ENG1 first?
It should not matter but starting ENG2 first sometimes made it happen.
Frustrating though.

[NicD]

Thanks - wasn't aware of that. I start ENG2 first usually, so I'll try ENG1 first and see what happens.

[NicD]

Out of interest .... is anyone else using the PMDG737 (minus the panel) with PMsystems - and it's all going ok for you ?

[James Twomey]

The below is what I had to do to get my PMDG to work with PM Systems.

Hope that this helps.

Regards,
James

"Thomas Boehme" schrieb im Newsbeitrag
news:268984.53235@wb.onvix.com...
> The reason you can't start engines with the PMDG and PMsystems is the
> cut-off
> logic.
>
> PMsystems sets the fuel cut off whenever the N2 falls below 21%. However,
> during engine start, the PMDG engines shortly drop below 21% N2 causing
> pmsystems to cut off fuel.
>
> Change the value 21 in the section quoted below to a lower value (I think

> 15
> works, I am not home, so I can't check). After that you can start
> engines!
>
> relevant section in pmsys737.txt:
> ---
> if pumpsloff or (fs1n2
> fscutoff1 = 0
> else
> ---
>
> You have to change it for both engines!
>
> bye,
> Thomas
>

[aluver]

Hi NicD,

I have no problem with engine start sequence, PMDG 737-700 + PMsystem, I use Thomas Richter's pmsys737ng1051 files.

You write "Everything is set properly – APU running, APU bleed on, packs off, valve open etc", Didn't you forget eng bleed on too ?

[aluver]

Hi NicD,

I have no problem with engine start sequence, PMDG 737-700 ( no panel) + PMsystem, I use Thomas Richter's pmsys737ng1051 files.

You write "Everything is set properly – APU running, APU bleed on, packs off, valve open etc", Didn't you forget eng bleed on too ?

Did you try to open valve with FS keyboard command ? ( CRTL + F4 ), I think PMsystem could interfer with FS about that.

[NicD]

James ... you're a legend!!!! ... that was the problem. I set the N2 condition values to 15% and she started like a cat on a hot tin roof! Thanks mate!

Would be good if PM had this info in their doco and support info.

Aluver, thanks, yes engine bleeds were on.

Goin flyin ...

[James Twomey]

NicD,

Your more than welcome. I was just glad that I could help.

Oh and yes, I think that this woudl be a good information for PM to document somewhere.

For Aluver; where did you get the lastest Thomas Richter's pmsys737ng1051? Once the PM forum site went down, I was never able to find it.

Regards,
James