Over voltage on main bus
in 912iS Technical Questions
10 years ago
Hi,
Our school has been running 912 iS engines on our entire fleet of training aircraft. However we have been facing problems with the voltage regulators. One of our aircraft has just had the coil kit changed and the fuse box and the regulators changed.
The Efis today registered a voltage of 14.0 with no load on June system, on loading the system with lights and avionics the voltage dropped to 13.7 volts. We then came back and did a ground run on the aircraft, buds registered a voltage of 13.9 with and without any load on the system.
When we checked the voltage across the battery terminal we found 13.7 without any load and 13.4 when the lights and avionics were switched on.
What are the acceptable voltages that should be displayed. I do understand that the Efis display could be wrong due to incorrect calibration.
Any help would be appreciated.
Our school has been running 912 iS engines on our entire fleet of training aircraft. However we have been facing problems with the voltage regulators. One of our aircraft has just had the coil kit changed and the fuse box and the regulators changed.
The Efis today registered a voltage of 14.0 with no load on June system, on loading the system with lights and avionics the voltage dropped to 13.7 volts. We then came back and did a ground run on the aircraft, buds registered a voltage of 13.9 with and without any load on the system.
When we checked the voltage across the battery terminal we found 13.7 without any load and 13.4 when the lights and avionics were switched on.
What are the acceptable voltages that should be displayed. I do understand that the Efis display could be wrong due to incorrect calibration.
Any help would be appreciated.
