Hi,

 

Just wondering if anyone else has noticed this on the 737-800.  I fly the aircraft for a living and have found the sim very useful for practising both procedures and flying exercises.

 

When I was going through the pre flight flow I noticed that when I turned on the fuel pumps I got the noise of the hydraulics turning on.

 

The other thing was while I was flying on one engine and needed to engage the A/P to get set up for an approach etc. I found that I had to completly centre my rudder trim or else the aircraft flew off to one side. I thought this was unusual as with one A/P enaged during flight it should not have control over the rudder. In the aircraft you can engage the A/P but you need to either hold the rudder in yourself or trim it off.

 

Any thoughts?

 

Stephen Smartt

Do you have the rudder controls for FS9 set with the auto-rudder OFF?

 

I found that I had to completly centre my rudder trim or else the aircraft flew off to one side.

 

You referring to hardware rudder trim?

Do you have the rudder controls for FS9 set with the auto-rudder OFF?

When I was flying it manually I was keeping the rudder in with my feet and it was all ok

 

You referring to hardware rudder trim?

I trimmed it out using the actual aircraft rudder trim via the VC and before engaging the autopilot it was all trimmed out but when I engaged the AP, it obviously was putting its own input in from somewhere as with the rudder trim in there was too much rudder in

Hi,

 

Just wondering if anyone else has noticed this on the 737-800.  I fly the aircraft for a living and have found the sim very useful for practising both procedures and flying exercises.

 

When I was going through the pre flight flow I noticed that when I turned on the fuel pumps I got the noise of the hydraulics turning on.

 

The other thing was while I was flying on one engine and needed to engage the A/P to get set up for an approach etc. I found that I had to completly centre my rudder trim or else the aircraft flew off to one side. I thought this was unusual as with one A/P enaged during flight it should not have control over the rudder. In the aircraft you can engage the A/P but you need to either hold the rudder in yourself or trim it off.

 

Any thoughts?

 

Stephen Smartt

What you are hearing is the fuel pump not the hydraulics. They do make similar sounds.

To be honest I don't hear the fuel pump within the cockpit. If the cabin and cockpit door is open you'll hear the apu starting up. You can hear hydraulic pumps if packs/recircfans are off. But as soon as you turn on recirc fans inside the cockpit you hardly hear anything. I am not a pilot. This is my experience when setting up the 738 for the flight crew (powering apu and air conditioning and sometimes IRS). We power on APU from battery power, not GPU. It's funny to see 600ampere going out of the battery cells :-D

In the -800 don't ever hear them from the cockpit. Since that's all I fly I can't say about the others but one of the guys who flies the -700 said he can hear the pumps from the cockpit in that. I know if you go back in the cabin between the wings you can hear the fuel pumps running though.