mooneyM20K_shah

thanks for your assistance! i managed to find a Gill G-35 battery in Belgium via the Smets Aviation Service. they will airmail it dry to the local maintenance facility. luckily the maintenance here is certified for the acid refill. the engine will be hopefully running soon, again. another point which i passed over: during the first of two GPU assisted engine start-ups (with only the master switch on), the HSI circuit breaker jumped out as soon as the radio switch was turned on. the annunciator pannel indicated high voltage, and the avionics was going nuts. I turned off the radio and master switch, and turned on the master switch again (while the engine was running on the ground). Everything was “normal” again and the avionics was apparently working. i pushed in the HSI circuit breaker again. it didn’t pop out. during the flight, i noticed that the directional gyro of the KG102A was u/s. however the pitch gyro of the autopilot system was still working. The HSI circuit popes out again, with a subtle burnt smell. i didn’t touch the circuit breaker again. Shortly after i landed to my destination airport safely. any thoughts about what could have happened? during the GPU startup I did explain the 12volt nature of the system. however I didn’t see how many volts they actually applied.

thanks for the subtle remark. indeed, the ammeter indicates a normal around-zero+ value after 2-3 minutes

that is exactly what the local maintenance offered. a car battery. however, the Mooney would not be in an airworthy condition, whatever consequences this would have in case of an incident/accident... flying back the 1.000NM to my home airport via an airport with external power sources is an option

good day, my engine doesn’t want start with its own battery. there is barely enough power to rotate the prop just a bit. an GPU/APU does the job very well. After startup with GPU the ammeter shows a positive charging rate, droping back to normal after few minutes. During the flight everything is normal, no indications on anomalies. However, the engine doesn’t restart on its own battery power (tried after a 2.5h flight). a GPU is again needed for start up. I guess the battery is dead. has anyone a better indication? Beeing right now on vacation in Romania, with difficult access to suppliers, can anyone provide me a spare battery on short terms? see attached picture . thanks for any feedback Shahriar