.3. or 4 letters). DME Hold feature is incorporated in both the Nay 1 and Nay 2 controls heads. belly mounted 1-band antenna AIR DATA I Penny and Giles- Air Data Computer. %/encoding output to transpander(s) AIR DATA 2 Penny and Giles -Nn Data Computer. mancoding output to transponder(s) Dual AtiloploVFD SPZ MOO -