B737 IRS Switches

[archen]

Hey guys,
Been doing some work on the IRS switches located on aft ovhd this evening.

For those who are unsure of the real IRS switches they are locked to the OFF and ATT positions meaning that you need to pull the knob to turn the switch to OFF and ATT. To turn them from OFF and ATT, you will not need to pull the knob.

http://youtu.be/Gy7vTcFmZZk

Best wishes,
Anders

[mickc]

Hi Archen

Should fit fine on a Simworld Aft Ohead with about 3 mm to spare.

The width isn't a problem, its the distance between the annunciators and the bottom of the panel.

If its any help,  i have a full Autocad file of all the 738 panels i can send you.

[archen]

Hello

Thank you very much for your fast reply.

I would love to have that file if you don't mind. Please email me at the email above in the first post.

Many thanks!!

Anders


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[mickc]

File is on its way

Having a think about it, if you could orientate the switch so that the flat sides were at the top and bottom, it would give more room to move.

[archen]

Thanks!!

I was also thinking about that solution. I might add a few holes holes so the user can use which suits their Ovhd best.

Thanks for your input! Much appreciated .

Anders


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[Sean]

Hi Anders

I can check my Engravity overhead tomorrow for you.

While your here, do you have any autobrake rotarys in stock?

Sean

[archen]

Thanks a lot Sean! Looking forward to your report.

I have one auto brake in stock Sean.
After this one I will not be able to deliver any for some weeks if my supplier don't get more rotary switches faster than expected. The last information I got from them was early February

I'm looking at alternatives but doesn't look to good.


Edit: found two more rotarys. Will make two more auto brake tomorrow.

Best regards,
Anders


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[Sean]

I'll buy that switch. I will speak with you tomorrow.

[archen]

Ok. I'll keep that switch for you. Thanks!




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[sluyt050]

Hi Anders,

They will fit in a FDS Aft OVH. In the z-direction however they have to cope with the rims of the mounting frame and a bracket, in total 3 mm in height. See pictures for details.

Edward

[archen]

Fantastic Edward! Thank you very much!

It will clear the the bracket. Actually it is the same mounting as the autobrake. Do you think the autobrake fit in at depth also?

I'm using the autobrake housing, just another mechanism in the bottom part.

Anders


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[sluyt050]

Fantastic Edward! Thank you very much!

It will clear the the bracket. Actually it is the same mounting as the autobrake. Do you think the autobrake fit in at depth also?

I'm using the autobrake housing, just another mechanism in the bottom part.

Anders


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Anders I cannot confirm the available depth since I did not assemble the FDS nose section yet. But if required it's always possible to make a hole in the shell.

[archen]

Sorry I missunderstood you regarding the z depth about the bracket. The switch has exactly the same measures as the autobrake so it's not that long so that would not be required I guess. If I recall correctly Steve told me there is quite much space in the shell.

As mickc proposed, I have now added more selectable mounting postions. Now the switch can be mounted in different orientations if needed.

/
Anders

[archen]

Short demo of the first switch

http://youtu.be/Gy7vTcFmZZk


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Edit: new video

[fsaviator]

Archen, are you good with the simworld Aft overhead or do you need more dimensions?

Any news on the Yaw Damper switches?  I know you're busy, just wondering.

Warren

[archen]

Hey Warren,

At the moment I'm good, thank you for offering your help. Looks like the switch will fit without problems.


Regarding the yaw damper I have bad news. I don't feel comfortable with the heat the solenoid is generating so I'm looking at another solution. When I decided not to manufacture the version I showed you guys I was well into these switches so when IRS switches is official I'm going to redesign yaw damper. Sorry, but risking anyone's cockpit due to the overheat problem does not feel good and I would never risk that so this was the only option.

I do have an idea how to achieve the same result (solenoid not kicking the toggle back) without having to power the solenoid at all time.

I'll post this in that thread as well.

Anders


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[fsaviator]

No issues Anders.  Understood and appreciate the update.

Enjoy your progress to your PPL.  One of the best days of my life when I solo'ed for the first time!

[archen]

Many thanks Warren!


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[Sean]

Hi Anders

Here are a couple of pics of the back of the current Engravity performance line (DIY) AFT overhead. Very uncluttered, the switches should fit okay. The locating holes are in the 2 o'clock position when viewed from the back. Just need a little clearance for the backlighting, if that can be incorporated (or modified).

[archen]

Thank you very much Sean! Perfect pictures. Now we can confirm it will fit in simworld, FDS and engravity. I guess they will fit all scale Ovhd's.

Big thanks to everyone!

Regarding the backlight, it is 4mm space between panel and switch so it should not be any problems to fit a few leds or point a led strip in under. Same for the starters, autobrake and n1/SPD ref switches.

Anders


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[markfire]

Anders


I have simworld aft overhead.   I'll check for you tomorrow.


Mark

[archen]

Hey Mark,

Simworld, FDS and engravity is confirmed so I think I might have all I need at the moment.

I'm now waiting for some information to be confirmed from a couple of real world pilots before I officially finish them and add them to my products on the website.

Thanks for offering your help!

/Anders


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[markfire]

Sorry, just read whole thread, came in a bit late didn't i : )

[andthiel]

Hi Anders

My AFT OVHD is from Sismo and your switches would fit here, too.



I didn't do the backlighting yet. Will wait for your switches first...

:-)

Thanks for another great hardware addition!

Cheers,

Andreas

[archen]

Guys,
Some update regarding the switch.

I've been given the information that there is two different IRS MODE SELECTOR switches available. One for 2/300 series and one for NG series.

The difference between these two switches is that the detented positions looks different. As you can see on the movie this IRS switch have detents between ALIGN->OFF and NAV->ATT. This is the 2/300 switch.

*Below is only confirmed by Boeing documentation and a video of a 600NG real switch.*

It appears that the NG's have the NAV position Guarded, in practice you will need to pull the knob to get out of NAV. You will not need to pull the knob to go to NAV though. So the difference is that you not have to pull the knob to go from ALIGN to OFF like in the 300 series but instead you will have to pull the knob to go from NAV to ALIGN or NAV to ATT.

This is not yet confirmed in the real aircraft though, could be other options but I have two real-world NG pilots who will confirm this for me.

Necessary changes to the mechanism have already been done, just waiting to get this confirmed.

Any NG pilots here who have any information in this matter?

Made some research and found some incidents where pilots accidentally turn IRS out of NAV so logically I find it more likely that the NAV should be guarded in both direction.

I'll keep you updated


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