Exhaust

[Frank DeBartolo]

Is there an AD regarding exhaust inspections? Someone said something in the past about doing 25 hour inspections on the exhaust.

Thanks,

Frank DeBartolo

[Mark Julicher]

Re: Exhaust

There is not an AD.
However,
The original heat muffs on the BC12-D have a placard that says to remove the muff and inspect the exhaust every 25 hours. The placard is an OEM maintenance directive. It can be difficult to perform this inspection, but with a small mechanics mirror and a modest amount of muff disassembly you can get a pretty good look at the exhaust tubing.

[dewhitaker]

Re: Exhaust

This is something you definitly need to do! Pinholes in the exhaust can lead to carbon monoxide in the cabin. Years ago Forrest saved our butt during an annual on the Tri-Pacer. He and I flew together and he tested the air coming from the cabin heat for the carbin monoxide. Dad replaced the exhaust. Problem fixed.

On the T-craft, if the exhaust gets bad enough it will crack, and you may come back to the field sometime with the bottom 10" or so missing. Wonder how I know that?

[Frank DeBartolo]

Re: Exhaust

Thanks for the comments, I have been examining the exhaust, but did not know if it was an AD.

Frank D.

[Forrest Barber]

Re: Exhaust

That was a required inspection item by the factory the placard plainly states remove every 20 hrs. ; WE then learned about the CO2 mine detector & the spot button method , palce the C)2 button low int he cabin and LOOK at it each flight. . OR the carb heat will drop the RPM way down if hot exhaust gas gets in on that side.

[N3377D]

Re: Exhaust

I have been waiting for this topic to come up. I purchased a bc12d last summer and it has always had an extreme RPM drop while checking the carb heat. This plane is very original and has the original exhaust on it.There are some visible pin holes on the outside the heat muff area. I suspected there might be internal leaks so I installed an o2 detector in the cockpit. So far I have had no bad readings, although I haven dared to use the heater. My question is where do you get a legal replacement or a fast rebuild on these exhaust systems?

[astjp2]

Re: Exhaust

I installed Hanlon Wilson stuff in mine, but Dawley does a great job and has a fair price. Tim

[mulwyk]

Re: Exhaust

N3377D:
Nice looking "T". I tried to enlarge the picture, but wasn't able to. What's that paint color...black and silver?

[N3377D]

Re: Exhaust

Thanks for the complement its a pretty nice old bird. The paint is black and gold with a clear coat that had gold mixed in it. Not the way I would have done it, but its what it is. This plane is unusual that it had only 267 hrs engine and airframe. Lots of sitting ! It sat from 1966 til 2003 when the fabric and exterior was freshened up. Under the cowl was 100% original everything 1946model. Thanks for the exhaust info.

[VictorBravo]

Re: Exhaust

Guy named Sonny Poarch in Florida advertises NICE stainless exhaust systems on Barnstormers. As I have posted previously on this subject, I suggest you have some other friend of yours call him and get the exact specifications of his system.

When your friend gets the specifications, have a cup of coffee with him to discuss the day's events, then wait a couple of days, and then YOU write Poarch an order form letter asking him to build an "owner produced part", based on YOUR (aircraft owner's) list of specifications and dimensions. Write the letter so that you are assuming all responsibility, you are the ultimate manufacturer of the part, and Sonny is only a sub-contractor working to your specs, etc. etc.

By doing it this way, you should wind up with a NICE stainless exhaust that does not corrode, it will fall within the intent and legality of the FAR's for owner produced parts (THANK YOU FAA sincerely for letting that rule stay in existence!!!), and you should be able to have a safer airplane.