Used on approach light sequence flasher 2 (alsf2). switch, special 1A1S7, ti-6850.69 instruction book, dual mode high intensity approach lighting system (ALSF2/ssalr) fa-10700, vol iii, sec 8, pg 8-64
Used on runway end indicator lights (reil). function: switch, interlock; reference data: 2A2S1, ti 6850.80, fa 10264, pg 8-92; 2A2S1, ti 6850.79, fa 10229, pg 8-19; ; 2A2S1, ti 6850.74, fa 10096, pg 8-19