EFD1000 PFD Pilot’s Guide
CHAPTER 1, WELCOME
EFD1000 PFD Pilot’s Guide
EFD1000 PFD Pilot’s Guide Page 1-7A-01-184-00 REV B
1.1.4. Analog Converter Unit (ACU)
The Analog Converter Unit (ACU), included with most Pro PFD systems, enables the
all-digital EFD1000 system to interface to analog avionics when required. The ACU
concentrates multiple analog interfaces and converts them to the digital ARINC 429
buses supported by the PFD. Control parameters, such as desired heading, are also sent
from the PFD to the ACU for conversion to analog format for autopilot support. The ACU
is required when any of the following capabilities are required in a Pro PFD installation:
Interface to supported autopilots.•
Interface to conventional VHF navigation radios.•
Interface to legacy (non-ARINC 429) GPS navigators.•
Interface to supported radar altimeter decision height annunciations.•
If ARINC 429-based digital radios, such as the Garmin 400/500-series GPS/nav/comm
radios, are installed in the aircraft, and no other aircraft interfaces are desired, the ACU is
not required.
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