AH-1S Attitude Director Indicator.
US Army employee: Peter Boxman, Avionics System Engineer, RDE&amp;L Directorate, Ft. Monmouth, NJ
1976-11
<a rel="nofollow" class="external text" href="http://www.rucker.army.mil/avjournal/1970/1976/AVN_DIG_1976_11.pdf">AH-1S Avionics</a> (United States Army Aviation Digest, Novamber 1976, Vol. 22, No 1,) page 44.