![](http://alphaavia.com/wp-content/uploads/2020/06/HERCULES-C-130-and-BOEING-737-200-2-scaled.jpg)
EFD-5.5 -
Electronic Flight Display 5.5
An avionics instrument used as navigation display of Hercules C-130 with 3 modes: Attitude Direction Indicator (ADI), Horizontal Situation Indicator (HSI), and Radar Display Unit (RDU).
![EFD-5.5 Electronic Flight Display 5.5 EFD-5.5 Electronic Flight Display 5.5](http://alphaavia.com/wp-content/uploads/2020/06/EFD-5.5-Electronic-Flight-Display-5.5--200x200.png)
EFD-6.0 -
Electronic Flight Display 6.0
An avionics instrument used as navigation display of Boeing 737-200 and Hercules C-130 aircraft with two display modes: Electronic Attitude Direction Indicator (EADI) and Electronic Horizontal Situation Indicator (EHSI).
![EFD-6.0 Electronic Flight Display 6.0 EFD-6.0 Electronic Flight Display 6.0](http://alphaavia.com/wp-content/uploads/2020/06/EFD-6.0-Electronic-Flight-Display-6.0-200x200.png)
DDSC -
Digital Data to Synchro Converter
An avionics instrument of Boeing 737-200 used for converting digital data (ARINC-429 interface) to analog data.
![DDSC Digital Data to Synchro Converter DDSC Digital Data to Synchro Converter](http://alphaavia.com/wp-content/uploads/2020/06/DDSC-Digital-Data-to-Synchro-Converter-200x200.png)