R.C ALLEN RCA 22-7
The RCA22 vacuum horizon is controlled by air driven precision gyros to ensure the pilot receives pitch and roll information. The coloration of blue and brown presents a realistic spherical exhibition of flight. The RCA22 instruments have a dark blue/brown display, fixed pointer and are unlighted by default. All R.C. Allen vacuum gyros run off of 4.5 inch Hg and erect time is 3 min. The instrument fits in a standard 3 1/8 panel cutout. A ¼ -18 NPTF nylon tube slip fitting is recommended for vacuum hose installation. A 1/8 – 27 NPTF nylon tube slip fitting is recommended for vacuum gauge installation.