Intercooler specs please?

[weebyf15]

Happy Thanksgiving; I have a question that's been bothering me. I own a 79 P337H with American Aviation Intercoolers installed in the late 1980s. My question is; all of the POH supplements they provided me show operating limitations and placards of Normal Take-off power-32.8 Hg MAP (Standard Sea Level Conditions). Yet my actual aircraft Placard says 35.3 Hg MAP. The 35.3 agrees with my research across this forum; but why the difference between what my supplement says and the actual aircraft Placard. Bottomline question; What should I be using?? In my aircraft, if I apply full power at sea level, I can easily exceed both max RPM (2800) and even MAP of 35.3. Why the difference with the supplement directed placard label and the actual one in the aircraft?

121 EW P337H owned since Aug 2018

[hharney]

Originally Posted by weebyf15

In my aircraft, if I apply full power at sea level, I can easily exceed both max RPM (2800) and even MAP of 35.3.

You should not be exceeding these values, your limits are not set correctly.

[weebyf15]

Thank you all; Herb I have not intentionally exceeded the limits and will talk to my Mechanic to get them adjusted. I mostly fly turbine aircraft, in which the throttles are full up (military power) for takeoff. As Of late I have noticed this results in too much pressure about 36 and rpm about 2900. So back to the original question in this thread from me. The placard and Pilot Sup both say AA inter coolers but the sup says 32.8 and the placard says 35.3, which should he adjust it to, or more importantly, which should I ensure I do not exceed.
Thanks if you can help

[hharney]

http://americanaviationinc.com/

[weebyf15]

Great tip; got an immediate answer and they sent me the correct POH supplement. A/C placard stating 35.3 MAP was the correct answer. Thank you

[98_bdanny]

Who holds the STC now?

[hharney]

American Aviation still has the STC. This is a different system than the Riley Intercoolers