juanM20J

That is exactly what I had to do the first tie that occurred to me 2 weeks ago (July 2023) Since then , removed the seat, cleaned the wholes, re-installed the seat and yet: problem remains my seat is not locking properly Rail track holes or wheels do not look too worn - Will double check if the rear wheels are more worn than the front ones which could make the seat's front position be slightly lifted thus making the pins not go deep enough

Many thanks Guillaume, cnoe, jsimmons619, hyette6420, 1964-M20E for your suggestions and shared experiences. Also thanks to all those vintage british cars drivers for sharing the issues related to grounding corrosion... I also once upon a time owned an MG for 4 years... but luckily had no issues with that then. I will post the solution... once we find it - Juan

Thank you guys for your prompt responses - FYI My Mooney has a pressure transmitter located in the engine compartment, a Transducer/amplifier located on top of the instrument cluster and the actual pressure display (by the way very similar arrangement to the fuel pressure system) My shop did tighten the grounding nut... but will ask them to remove it completely and see if there some corrosion there. Guillaume, in case grounding check is not effective and we need to send the transducer for repair who is IAI (address) and cost od repair?

After installing a new GTN 750 last summer, oil pressure gauge indication works fine for a about 30 min of flight, then drops to almost zero, no oil or cylinder head temp increase. After landing, checking, same symptom. Avionics shop checked pressure (OK) and grounding at gauges - Pressure test on ground are normal - After several short fligts, also found that if I turn Master OFF then ON, oil pressure signal is back. Any suggestions?