The RDDMI instrument used on the Lockheed L-1011 is a rather generic one. Many of the RDDMI units used on the L-1011 did not provide the capability to switch from VOR to ADF with the two switches to the bottom right and the bottom left of the unit.
The units I picked for my project are actually from two different aircraft. The one featured in the blog posting was flown on a Boeing 737 and the other one that I used on this project was flown on a Boeing 747. However, the same RDDMI instrument was also used on the Lockheed L-1011.
Here are the internals of the instrument:
1) Top View
2) Left side
3) Bottom view
4) Right side
The two needles on the front of the instrument are driven by two Synchro Receivers. They are arranged in a rather interesting way. The shaft of the receiver in the back runs through the synchro receiver in the front.
Buen aporte amigo.
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