PILOTS SIDE AIR INTAKE MYSTERY OUTLETS ?

[DCarlton]

On my pilot's side Air Intake Scoop, there are two vertical outlet ports before the vent eye ball.  With the eye ball closed, you still get full flow through those outlets.  Any idea where those are supposed to go or whether there used to be SCAT tube attached?  Don't see anything in the parts manual.  Please see pdf file for exact location.  Thanks.  

Inlet Scoop Outlets .pdf

[ArtVandelay]

They are suppose to have hoses going to the back of the avionics rack(s).

[Shadrach]

1 hour ago, DCarlton said:

On my pilot's side Air Intake Scoop, there are two vertical outlet ports before the vent eye ball.  With the eye ball closed, you still get full flow through those outlets.  Any idea where those are supposed to go or whether there used to be SCAT tube attached?  Don't see anything in the parts manual.  Please see pdf file for exact location.  Thanks.  

Inlet Scoop Outlets .pdf 857.93 kB · 8 downloads

That’s very odd. The schematic you show is for 65-66 C,D and E. I do not believe my 67F has those ports. Mine has a wemac (eyeball) vent and nothing else. Your bird is 7 serial numbers newer than mine with an airworthiness date just 4 days later.

[MikeOH]

My '70F only has the eyeball vent

[DCarlton]

37 minutes ago, Shadrach said:

That’s very odd. The schematic you show is for 65-66 C,D and E. I do not believe my 67F has those ports. Mine has a wemac (eyeball) vent and nothing else. Your bird is 7 serial numbers newer than mine with an airworthiness date just 4 days later.

Those ports are behind my interior carpeted panel.  They're open to the exterior.  That schematic is all I could find in the parts manual to identify the configuration.  I have the eyeball and the two ports.  

[DCarlton]

1 hour ago, ArtVandelay said:

They are suppose to have hoses going to the back of the avionics rack(s).

That would make sense.  Forced cooling for the avionics but I don't see a place for connections on the other end.  Perhaps the open end was just secured in place behind the radios?  I'm thinking about capping those ports.  I have an avionics fan now.  

[bcg]

That would make sense.  Forced cooling for the avionics but I don't see a place for connections on the other end.  Perhaps the open end was just secured in place behind the radios?  I'm thinking about capping those ports.  I have an avionics fan now.  

That's exactly how it is in my 63 C, open scat tube secured behind the radio rack for cooling.

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[Skates97]

2 hours ago, DCarlton said:

That would make sense.  Forced cooling for the avionics but I don't see a place for connections on the other end.  Perhaps the open end was just secured in place behind the radios?  I'm thinking about capping those ports.  I have an avionics fan now.  

Newer avionics have fans and/or heat sinks. I have had mine capped for years and never had any issues with newer avionics even in AZ in the summer when it's 110°+ on the ground.

[Shadrach]

2 hours ago, DCarlton said:

That would make sense.  Forced cooling for the avionics but I don't see a place for connections on the other end.  Perhaps the open end was just secured in place behind the radios?  I'm thinking about capping those ports.  I have an avionics fan now.  

On my bird the avionics cooling plenum is fed by a the passenger side NACA duct via scat tubing. It is independent of the the ships heating and ventilation system and has its own butterfly valve with on/off detent. Interestingly the valve is not shown in the IPC. The avionics vent goes to a plenum/diffuser that distributes airflow from the top to bottom of the center stack. It all looks factory, but it is not in the IPC either

[ArtVandelay]

That would make sense.  Forced cooling for the avionics but I don't see a place for connections on the other end.  Perhaps the open end was just secured in place behind the radios?  I'm thinking about capping those ports.  I have an avionics fan now.  

I leave the open end secured behind the GTN which has a fan but figure if needs a fan it can benefit from some cooling air. Not sure if water could make its way up the entire length but I wouldn’t want a direct connection.

[DCarlton]

6 hours ago, Shadrach said:

On my bird the avionics cooling plenum is fed by a the passenger side NACA duct via scat tubing. It is independent of the the ships heating and ventilation system and has its own butterfly valve with on/off detent. Interestingly the valve is not shown in the IPC. The avionics vent goes to a plenum/diffuser that distributes airflow from the top to bottom of the center stack. It all looks factory, but it is not in the IPC either

I have that same valve on the starboard side.  Can’t remember where that tube goes.  Will take another look while the seats are out.  

[DCarlton]

5 hours ago, ArtVandelay said:

I leave the open end secured behind the GTN which has a fan but figure if needs a fan it can benefit from some cooling air. Not sure if water could make its way up the entire length but I wouldn’t want a direct connection.

I just feel better closing the vents and eye balls when I park the airplane.  Probably more emotional than practical.  Was surprised to find these ports open.  

[ArtVandelay]

I just feel better closing the vents and eye balls when I park the airplane.  Probably more emotional than practical.  Was surprised to find these ports open.  

I’m usually hangared, but my airplane cover protects the vents when outside, otherwise I would worry about wasps, etc using them as a home.