Jeff_S Posted August 14, 2021 Report Share Posted August 14, 2021 Cross-posted from the Avionics forum to get more eyeballs. Hey folks. Still tracking down an annoying issue where my Flight Director goes schizoid when I engage ALT mode. I've always suspected this is something in the static line that is giving the pressure transducer for the 55x erroneous readings. Sometimes when I engage alt-static this improves the performance, but sometimes not. Working with Savvy and S-TEC, they concur with my analysis, but S-TEC has no idea where the pressure transducer was mounted in these configs. I've sent a note to Mooney support, but thought I'd open this up to the knowledgeable crowd here. I would like to have a good idea about this before giving S-TEC's testing instructions to my shop, to avoid spending money having them hunt around for it. Thanks! Quote Link to comment Share on other sites More sharing options...
KSMooniac Posted August 14, 2021 Report Share Posted August 14, 2021 FWIW, my aftermarket STEC30 has the transducer way up in the left side behind the panel, below the windscreen. Easy to tie in to the static line in that location, I suppose. I'd look there first if you don't get a definite answer. Sent from my LM-V405 using Tapatalk Quote Link to comment Share on other sites More sharing options...
vorlon1 Posted August 14, 2021 Report Share Posted August 14, 2021 14 minutes ago, KSMooniac said: FWIW, my aftermarket STEC30 has the transducer way up in the left side behind the panel, below the windscreen. Easy to tie in to the static line in that location, I suppose. I'd look there first if you don't get a definite answer. Sent from my LM-V405 using Tapatalk Same location for the 60-2 in my C. Quote Link to comment Share on other sites More sharing options...
Rwsavory Posted August 14, 2021 Report Share Posted August 14, 2021 Mine is aft of the rear avionics bay. Quote Link to comment Share on other sites More sharing options...
David Lloyd Posted August 14, 2021 Report Share Posted August 14, 2021 3 hours ago, KSMooniac said: FWIW, my aftermarket STEC30 has the transducer way up in the left side behind the panel, below the windscreen. Easy to tie in to the static line in that location, I suppose. I'd look there first if you don't get a definite answer. Sent from my LM-V405 using Tapatalk Same except 60-2. 1st pic is looking down thru the windshield to the pilot side, with the gear handle for ref. You're looking at the 2" round blue thing about an inch thick. Second picture, it is just to the left of the radio stack. Look closely and you can see the static line to the center. Mine is blue plastic, some are metal. Quote Link to comment Share on other sites More sharing options...
Jeff_S Posted August 14, 2021 Author Report Share Posted August 14, 2021 I see the pics...thanks! Quote Link to comment Share on other sites More sharing options...
Guest Posted August 15, 2021 Report Share Posted August 15, 2021 9 hours ago, Jeff_S said: Cross-posted from the Avionics forum to get more eyeballs. Hey folks. Still tracking down an annoying issue where my Flight Director goes schizoid when I engage ALT mode. I've always suspected this is something in the static line that is giving the pressure transducer for the 55x erroneous readings. Sometimes when I engage alt-static this improves the performance, but sometimes not. Working with Savvy and S-TEC, they concur with my analysis, but S-TEC has no idea where the pressure transducer was mounted in these configs. I've sent a note to Mooney support, but thought I'd open this up to the knowledgeable crowd here. I would like to have a good idea about this before giving S-TEC's testing instructions to my shop, to avoid spending money having them hunt around for it. Thanks! We had the same issue with an Ovation. The transducer was located above and forward of the MFD. the hose was to short and stretched to reach the transducer and eventually split. It was blue and about 1-1/2” in diameter. Clarence Quote Link to comment Share on other sites More sharing options...
Jeff_S Posted August 15, 2021 Author Report Share Posted August 15, 2021 Thanks Clarence. I think that's the consensus location of the transducer, and it's interesting to hear that your static line had split. That has been my diagnosis for some time. I am attaching the sheets from a parts manual that I got from another friend who has a Bravo with the G1000/S-TEC 55x, and this supports the location of the transducer right behind the MFD. Others may find this of interest as well. Cheers! G1000 Avionics Parts Diagram.pdf Quote Link to comment Share on other sites More sharing options...
Guest Posted August 15, 2021 Report Share Posted August 15, 2021 8 hours ago, Jeff_S said: Thanks Clarence. I think that's the consensus location of the transducer, and it's interesting to hear that your static line had split. That has been my diagnosis for some time. I am attaching the sheets from a parts manual that I got from another friend who has a Bravo with the G1000/S-TEC 55x, and this supports the location of the transducer right behind the MFD. Others may find this of interest as well. Cheers! G1000 Avionics Parts Diagram.pdf 4.06 MB · 2 downloads The Ovation I had in was having Alt hold issues as well. Cabin heat and ventilation would drive it nuts. The line was split at the transducer. Clarence Quote Link to comment Share on other sites More sharing options...
carusoam Posted August 15, 2021 Report Share Posted August 15, 2021 We have seen some rubber hoses used in the past around here. Age destroyed the hose, the plane had a hard time following inadequate altitude info… Similar to using an alt stat source… Best regards, -a- Quote Link to comment Share on other sites More sharing options...
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