Skip to main content

Baron 58 CHTs on both Engines 446° at at Run-up Do you still take off? redline is 460°

As I was Taxing to run-up CHTs were already at 410° both engines and during run up at full throttle noticed
446°, FF 27.2 - 27.7 GPH on both weather 87° humid - Cowl flaps Open, engine I0-550C. the question is :
Upon seeing those uncomfortable readings on Garmin EIS display do you abort take off or would you still take off and hope for CHTs to cool down once airborne? what causes such elevated CHTs knowing air vents (cooling), FF, Mag timing are all good fresh out of annual? #1 Is high CHTs 446° enough reason in Decision Making Model warrant "Go or NO Go" #2 Do you suggest increase FF to 29.5 from 27.2 (30GPH redline) as a remedy when everything else seems up to specs? Thank you.
Correction:Aircraft Serial Number: TH-2090

Model: Baron G58
Aircraft Serial Number: TH-2080
Posted 6/18/2023 - 8 months ago
|

Replies Sort

I recall a week (or so) ago we discussed conflicting readings on your new EIS compared to the download; was that resolved and are you seeing an accurate representation of actual?

If all cylinders were showing this at the conditions you described above, and although I would prefer to see a little more fuel flow, I can't help but think your panel is not accurate. That does not mean ignore it! Any time an indication is that near the limits it needs to be resolved.

Mike
ABS Tech Advisor

Posted 6/18/2023 - 8 months ago
|
Quote

Hey Mike! thx for your reply.
-As for the previous topic Oil Press High. the filter was used AA48108-2. Shop didn't think it's a problem but went ahead and replaced them with the recommended ones 48109 filters, after oil calibration all went back to normal.
-Garmin Gauges are very accurate and were checked.
-As for CHTs, Data confirmed high CHTs as were shown on Displays exactly.
as a safety measure and that's #1Q is high CHTs as described above a legit reason in Decision Making Model warrant "Go or NO GO" ? would you still take off anyway? Thx

Posted 6/18/2023 - 8 months ago
|
Quote

No fly zone. You have a problem.

Posted 6/18/2023 - 8 months ago
|
Quote

Thx. do you bump FF up to 29.5GPH?

Posted 6/18/2023 - 8 months ago
|
Quote

I would cross check FF to metered fuel pressure, but unless it it off by several GPH, I don't think that would be the issue you are looking at as a fix. (I tend to sway towards 28.5 or 29 as a confirmed fuel flow number.) Published FF is 27.2 and metered pressure 18.9, so use that for your fuel flow indicator check with a known good / calibrated pressure indicator.

Posted 6/18/2023 - 8 months ago
|
Quote

Copy! Will do-Thx again Mike .
I recall my Bonanza FF was almost redline and CHTs kept nice below 385° in the climb.

Posted 6/18/2023 - 8 months ago
|
Quote

It seems to me that CHT’s of 410dF during taxi is really higher than normal as well. Have you has timing confirmed as in spec? Checked for any air flow obstructions?

BTW, is this a new Garmin install? Seems I hear a lot of chatter, from various sources, about unexpected readings
after these installs.

Posted 6/27/2023 - 8 months ago
|
Quote

Baron 58 CHTs on both Engines 446° at at Run-up Do you still take off? redline is 460°