Inverter, vacuum control - Brittain system

[FlyingDude]

Hey guys,

What's the purpose of this "inverter, vacuum control" in the 1967+ Brittain PC system, that's only connected to a wire? Number 5 in the diagram. 

Thanks.

Cheers

[0TreeLemur]

The inverter is a squat black cylinder (2"tall, 3-1/2" dia.) that takes 14VDC and converts it into 400Hz 3-phase  AC power, so the TC can use a brushless motor.  It is an integral part of the TC100 and connected to the TC by a 18" long shielded cable with I think 6 conductors inside.

[FlyingDude]

20 minutes ago, 0TreeLemur said:

The inverter is a squat black cylinder (2"tall, 3-1/2" dia.) that takes 14VDC and converts it into 400Hz 3-phase  AC power, so the TC can use a brushless motor.  It is an integral part of the TC100 and connected to the TC by a 18" long shielded cable with I think 6 conductors inside.

Thank you. 

[rakesb]

What is TC/TC100?

[N201MKTurbo]

6 minutes ago, rakesb said:

What is TC/TC100?

Turn Coordinator 

[carusoam]

Nice work Dude!
 

What makes this TC special is...

It is a Brittain TC that works with the Brittain wing leveler...

Original (1965) Brittain Wing leveler systems had a separate gyro in the tail to do the work... and an old army surplus TnB was on the panel...

So the TC100 is a touch better for two reasons...

Keep in mind it’s still only a TC...  TCs  make crummy back up instruments for flying in IMC...  they misbehave as they wear... and the pilot doesn’t know it until it gets bumpy...

PP thoughts only not a CFI...

Best regards,

-a-

 

[DCarlton]

Anybody know what part #6 does?  The pilot valve assembly?  I'm recently been working on my Brittain system (EVT with DG adapter).  Trying to understand all the components.  Thanks.  

[0TreeLemur]

That's the vacuum switch that deactivates the PC system when the pilot pushes on the button on the left yoke handle on my '67C.  I suspect that it cuts off vacuum to the TC100 port that feeds vacuum to the actuators, effectively disabling the system.

[DCarlton]

8 minutes ago, 0TreeLemur said:

That's the vacuum switch that deactivates the PC system when the pilot pushes on the button on the left yoke handle on my '67C.  I suspect that it cuts off vacuum to the TC100 port that feeds vacuum to the actuators, effectively disabling the system.

Ahh.  I thought the yoke button just bled off the vacuum to the TC.  Didn't realize there was a pneumatic switch.  

[0TreeLemur]

The diagram from the OP shows two air filters connected to the TC100, which made me wonder, because I'm pretty sure that I only have one filter connected.   Digging a little bit, I found this in the SMM showing parts & connections for '67 and on.  It only shows one filter.   Not sure the source of the inconsistency.

 

 

[DCarlton]

27 minutes ago, 0TreeLemur said:

The diagram from the OP shows two air filters connected to the TC100, which made me wonder, because I'm pretty sure that I only have one filter connected.   Digging a little bit, I found this in the SMM showing parts & connections for '67 and on.  It only shows one filter.   Not sure the source of the inconsistency.

 

 

The TC (TC100EVT) that I have (the one with the gold cup on the back) has six hose bibs.  Two go to filters on the end of a 14" hose.  The top one may have a restrictor after two inches but mine doesn't (but if so, you'd have two inches of hose, then the restrictor, then another 12 inches, then the filter).  So... in my case, the side and the top bib have filters).  I believe it's 7/32" hose.  Gates P/N 27043.  I got that P/N from the prior Brittain tech and ordered a roll.  My hose keeps coming off the top bib. Below are a couple of photos of a TC100EVT I found on line (not my exact unit).  

Edited May 16, 2021 by DCarlton
Clarification; additional details.

[0TreeLemur]

For reference:

 

[mke039]

My TC 100 started showing a no-elec flag after a recent annual. What we found was the TC got hooked up to reverse polarity and blew the 1a fuse in the inverter itself.

A new fuse was soldered in place and it is working again