Anyone shed any light, why all of a sudden after having done C&D's pre-flights in the -700 and -800 versions, in the -900, I get a klaxon horn blasting away merrily, but annoyingly? Tried to mute it, no joy and I've tried to do a Search here in the top right Search Box, but the search just hangs going nowhere.

Anyone shed any light, why all of a sudden after having done C&D's pre-flights in the -700 and -800 versions, in the -900, I get a klaxon horn blasting away merrily, but annoyingly? Tried to mute it, no joy and I've tried to do a Search here in the top right Search Box, but the search just hangs going nowhere.

Continuous or intermittent horn? If continuous then that normally means gear is up with landing flap, unlikely as you are pre-flighting on the ground! If intermittent it's probably the takeoff config warning so a throttle might be advanced (or the sim might think a throttle is advanced).

Hi Kevin

 

Thanks for that.

 

Here's the scenario. Parked at a Medium Gate at KATL, night, prepping aircraft,C+D, batt on, GPU connections made,........That continous horn started as soon as I went from batt to Ground Power.Cleared all the maintenance entries, and it still kept on honking away until I had both engines running at full idle, APU off and was about to set flaps. I've heard that horn before if the cruise altutude was not set, but that was not the case here. Even switching off GPU and going to the APU made no difference. Odd that it did not happen to the -700 and -800 but only when I opted for the -900.

Hi Kevin

 

Thanks for that.

 

Here's the scenario. Parked at a Medium Gate at KATL, night, prepping aircraft,C+D, batt on, GPU connections made,........That continous horn started as soon as I went from batt to Ground Power.Cleared all the maintenance entries, and it still kept on honking away until I had both engines running at full idle, APU off and was about to set flaps. I've heard that horn before if the cruise altutude was not set, but that was not the case here. Even switching off GPU and going to the APU made no difference. Odd that it did not happen to the -700 and -800 but only when I opted for the -900

I haven't flown the NGX in about a week and the overhead is a blur to my memory, but I think there is a pushbutton somewhere on the lower central part of the overhead that says something like ground connection. I had your issue right as I got the NGX. I seem to remember said button silencing a horn.

Sounds like it might be something powered by the ground handling buses (powered only by GPU or APU).  Maybe the ground crew call horn or the APU fire warning horn?

I haven't flown the NGX in about a week and the overhead is a blur to my memory, but I think there is a pushbutton somewhere on the lower central part of the overhead that says something like ground connection. I had your issue right as I got the NGX. I seem to remember said button silencing a horn.

Tried the Alt Horn Cut-out, made no difference. Tried the adjacent Ground Call/Attend buttons below the Seat Belt/No Smoking signs,still no luck.

 

Sounds like it might be something powered by the ground handling buses (powered only by GPU or APU).  Maybe the ground crew call horn or the APU fire warning horn?

I'll check it out at KLAS on my return flight as I'm now at CL 330. Thanks to both for your help.

Maybe some odd setting got stored in a PanelState file, see: C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\PMDG\PMDG 737 NGX\PanelState, it's a longshot, could try rename the directory for a test flight.

Maybe some odd setting got stored in a PanelState file, see: C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\PMDG\PMDG 737 NGX\PanelState, it's a longshot, could try rename the directory for a test flight.

Thanks, Steve. Will bear that in mind when I turnaround.

Tried the Alt Horn Cut-out, made no difference. Tried the adjacent Ground Call/Attend buttons below the Seat Belt/No Smoking signs,still no luck.

 

I'll check it out at KLAS on my return flight as I'm now at CL 330. Thanks to both for your help.

The NGX simulation is so complex it's not surprising it occasionally throws a wobbly.  If some piece of software doesn't initialise properly it could cause a problem like this and a reload might be all that's needed to clear it. 

The NGX simulation is so complex it's not surprising it occasionally throws a wobbly.  If some piece of software doesn't initialise properly it could cause a problem like this and a reload might be all that's needed to clear it. 

Could not agree any more with you. Fingers crossed next turnaround.

Check your packs/pressurization as well...zone alarms, sounds like an ECS/pressurization issue. If your landing and field elevations aren t set prior to take off, or the pressurization is offset, then it will cause the klaxon. Which horn is it?

If you start APU and turn on APU Gen does it stop?

Check your packs/pressurization as well...zone alarms, sounds like an ECS/pressurization issue. If your landing and field elevations aren t set prior to take off, or the pressurization is offset, then it will cause the klaxon. Which horn is it?

Had set the elevation at KATL as near as I could get it, and the cruise level.

 

If you start APU and turn on APU Gen does it stop?

That is why I switched from the GPU to the APU, made no difference however.

Continous horn is no correct configuration of flaps/gears for landing.

Intermittent horn can be either TO warning config or cabin altitude warning.

In this case the problem on ground is not normal as it is the continous sound. Check landing gear lever and lights, over than this, check your saved flights, try to load another working flight, shut down the plane, save the panel state as your new C&D panel state and use it.

To cover other answers:

It has nothing to do with pressurization, or packs, it has nothing to do with other things (aircraft unpressurized in C&D, packs are not running in ground power only)

 

If the sound is similar to the ground call the problem is probably related to user error (IRS on dc power only, supply cooling fan either unpowered or not working)

 

The APU fire warning is like a ring bell of old phones, with it you have always a red MASTER WARNING turned on.

Check your packs/pressurization as well...zone alarms, sounds like an ECS/pressurization issue. If your landing and field elevations aren t set prior to take off, or the pressurization is offset, then it will cause the klaxon. Which horn is it?

It certainly will not do that. The cabin altitude horn goes off if cabin altitude exceeds 10000 ft. Incorrectly setting the altitude selections cannot cause that, and certainly not on ground.