Date: March 22, 2006

Products Affected: This bulletin affects EMS-D10 and EMS-D120 units that use oil temperature sensor part number 100409-001 (“type 1” sensor in the EMS sensor setup). This sensor is sold with Dynon Avionics' Lycoming / Continental engine sensor packages. This bulletin does not apply to your EMS if:

• Your EMS was shipped on or after March 21, 2006.
• Your EMS does not utilize the above oil temperature sensor.
• Your EMS-D10 firmware version number is greater than 01.02.00.
• Your EMS-D120 firmware version number is greater than 01.01.00.

Problem: To enable customers to use sensors without having to calibrate them in the field, Dynon Avionics characterizes each type of engine sensor that it provides and pre-loads that characterization into the EMS firmware. The characterization for this particular oil temperature sensor was found to be incorrect in the EMS-D10 and EMS-D120 firmware. At normal engine operating temperatures, this problem results in oil temperatures that are display up to 20°F higher than they actually are.

Action Required: Upload the latest firmware for your EMS model. Instructions: Download the latest Dynon Product Support Program and install the latest firmware for your particular product: Dynon Support Program Downloads Page