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Autopilot lights explained
#1
GPS - Green light is on when active
APR - When Approach mode is armed green light is on and GS green light is on
HDG - When armed yellow light is on and FD yellow light is on
NAV - Valid signal is yellow / Nav1 lock is green
REV - (Localizer backcourse) lights yellow as well as APR in green and GS in green
LVL - Wings level when armed yellow light is on and FD yellow light is on

PWR - Avionics power on
ENG - (Autopilot Master) Two green lights illuminated above

SPD - when on yellow light either on IAS or MACH is on, click on either yellow light to toggle to other speed mode
VS - When ALT hold is armed yellow light is on
GS - When armed green light is on and APR green light is on,  if Glideslope has active signal then Yellow light is on
ALT - Altitude hold is armed light is yellow, VS and FD lights are on yellow
G/A - not applicable

Pushing Test button lights all lights except Soft and G/A
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