red07ss

Thats the colour of the current Canadain FE seats, still need a paint number? or are you repainting it green?

Sounds like your normal brake control valve isn't working. When switching from normal to emergency, do you hear a loud clunking sound from the spool in the normal brake c/v slamming closed? When you switch from one system to another, in this case, normal to emergency, the normal brake c/v energizes and closes preventing fluid from going to your metering valve and out to your brakes.

But since you have changed it, have you shot power? As far as it bleeding down to 2700psi, that could be normal ops, there is a valve seating period, i want to say you wait 10 minutes after killing pressure, and then see how far it drops in the next 10 minutes. I'd have to check the book on that one.

You were right, was the normal control valve. We did replace it once already for this snag, but the replacement valve was faulty.

Thanks for the replies guys

Okay I'll start by setting up the aircraft:

-Power on

-Both emergency and normal brakes powered to 3000 psi (all is good)

-9-port handle is in the down position (powering all systems with aux pump)

Snag

-Turn off aux pump and normal pressure begins to deplete to 2700ish psi while emergency stays at 3000

-Select emergency brakes and start pumping to release hydraulic pressure

-Emergency pressure depletes, but so does the Normal at almost the same rate (this isn’t good lol)

-If you power up both systems again, kill aux pump, select Normal Brakes, and start pumping the pedals. Normal brakes deplete as they should and emergency stays solid at 3000 (works as advertised)

We have changed both Normal and Emergency Brake Selector Valves but snag persists. I’m starting to lean towards a faulty Normal Brake pressure return check valve OR the dual brake control valves.

Hope someone has a bit of input here, could really use the help lol. Thank a lot guys! :)

Hello all;

Thanks for the interest but problem is solved

I find lots of elusive bleed air leaks using the FLIR gun (Infa-Red). If the squadron dosent have one I'd try borrowing one from the base fire department

All E/H/J model Canadian hercs...

Enter "130" in type box

http://www.canadianwings.com/Aircraft/Database/index.php?type=Serial

I've always used an infared gun, but do the run at night so the plane is good and cold which allowes you to spot the leak quicker.

Another tool I like to use for fuselage pressure leaks (kind of off topic but kind of relates to air leaks) is simply baby powder puffed into the air from inside the plane.

Since there is no fix posted I figured I would chime in here.

We had the same problem about a month ago on an Canadian E model, we replaced the pressure reducer and it did not fix the snag. Our fix was simply replacing the Utility side filter element on the pack itself. Reason why we changed the utility filter was because the noise was happening only when the boost side of the system was cut-off. And the noise seemed that it was coming from the pack, and not the lines or valves.

The filter fixed the problem because the pack was stuck in by-pass mode. I figured that since the pack has no pop-its there had to be a way the pack would indicate a blocked filter, I guess the noise was its indication.

Here in the states '' we call it article 15''....

Hahaha Nice!!

I've heard stories of people throwing eggs out the sexton port as well.

ohhh man, now I'm getting ideas.... lol

I did it today and a lot of the guys got a real kick out of it.

- Pressurize the A/C to around 6 inMg (we were doing a drop check)

- Find a roll of toilet paper or paper towel

- Put a ratchet, or pen through the roll so it can spin freely

- Open up the old Sextant attachment point and hold the roll close to the hole (The attachment point is essentially a 6 inch diameter hole in the plane next to the crew door jettison handle)

- What happens is that the A/C pressure sucks the entire roll through the hole out of the top of the airplane to about 15-20 feet straight in the air

Here in Canada we call it the "Big Grey Whale" :D