The FAA issued the following SAIB on Nov. 21
This Special Airworthiness Information Bulletin (SAIB) informs registered owners/operators of an airworthiness concern for aircraft with an Aspen Avionics, Inc. (Aspen), Evolution EFD1000 Primary Flight Display (PFD), an EFD1000 Multi-Function Display (MFD), and/or an EFD500 MFD unit as installed by Supplementary Type Certificate (STC) No. SA10822SC. These units are installed in different configurations on, but not limited to, the aircraft makes and models listed in the attachment below. Specifically, this SAIB notifies owners and operators of temporary loss of all flight display information due to blanking during reset. In installations where multiple Aspen EFDs provide redundancy, this may result in loss of all altitude and airspeed reference during the reset period.
At this time, the airworthiness concern is not an unsafe condition that would warrant airworthiness directive (AD) action under Title 14 of the Code of Federal Regulations (14 CFR) part 39.
We were recently notified that there have been numerous reports of Aspen EFD1000 PFD, EFD1000 MFD, EFD1000 EBD, and EFD500 MFD units with software version 2.9 and the ADS-B IN (FIS-B) Weather Interface option repeatedly resetting itself in-flight. The reset occurs between five- to ten-minute intervals. During the time of the reset, the pilot might not have any EFD displayed information including access to altitude and airspeed for up to one minute. The cause of this safety issue is currently under investigation; however, preliminary information suggests that the cause of the continuous reset is related to the ADS-B IN interface. Pulling the ADS-B circuit breaker as described in section 3.2.6 of the Flight Manual supplement, has been demonstrated to resolve the issue.
The FAA recommends that owners and operators flying with Aspen EFD1000 and/or EFD500 units with software version 2.9 and the ADS-B IN (FIS-B) Weather Interface option installed restrict flight to Visual Flight Rules only and suspend night operations to allow safe operation in the event of loss of flight display functionality. Alternatively, the FAA recommends disabling the ADS-B IN (FIS-B) option.
The FAA requests that owners and operators of any ADS-B IN (FIS-B) enabled aircraft and the owners and operators of Aspen EFD flight display notify the FAA contact listed below of any similar events.
Owners and operators should be advised that service information from Aspen is forthcoming.