Yes, correct. Those are left and right from a Citation. Looking clean notwithstanding they're 27 years old. I'd like to get deeper down this rabbit hole chasing new ones.

Those pictures are perfect. They give the impression the units are fine without actually showing any detail of the fin condition. So you have no clue until you get one.

Mike C.

On this (timely) topic - can anyone recommend someone in the Texas region that actually understands A/Cs and will take the time to sort through mine? I’ve had my shop work on my Keith system in my 501 several times but it’s just not cutting it once it gets over 90F. Getting at best a 20d drop. Tons of airflow in the back, but very little airflow up front. They say they checked the ducts and didn’t find any issues. I have the cool sticks.

Thanks in advance,
Matt

20 degrees drop is the normal. I don't know what Nishant did to his to get his amazing results.

Jet Shades has been the lifesaver for me in the 501 cockpit. Everyone in the back enjoys cool temps while I used to cook up front (MU2 too). Jet Shades are a game changer. They block the heat tremendously. Worth every penny. Don't think that cheap tint shades are going to cut it, it's a greenhouse in the cockpit.
I also am super anal about passengers covering/blocking my only AC floor vent by the barrel seat. I bought the Cool Stiks system/STC but haven't been able to install it yet, but it will help with cockpit comfort too. Did I mention Jet Shades are awesome?

I let the airplane heat soak today for a few hours in the afternoon sun. Interior was 103. After turning on the A/C and letting it run for 10 minutes, the a/c was blowing 59F.

After running for 20 minutes, the interior temp dropped to 90. These systems are really under powered for the size of the cabin even when working optimally.

I invited Matt to come down so we could fix his a/c. 20 degree diff is not even worth having an a/c. A swamp cooler can do better than that.

Really high pressure on the high side due to an overly tight expansion valve setting and a somewhat slow blower speed on the evaporator.

The compressor will be working hard and you won't cool that well due to lack of good evaporator air flow.

It will also freak out passengers if the air is so cold i tis below dew point and the fog will look like smoke.

I had that once in my MU2 with the ACM.

Mike C.